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Information resources and services. Information resources and network services Internet Tutorial Use of services and network information resources

Internet Information Resources
Content
Introduction 2.
Information resources of the Internet. 3.
Email. 3.
Information network www ... 3
Information Technology e-business. 3
Conclusion. 3.
List of sources used. 3.

Introduction The Internet is a global computer network that unites millions of computers around the world. In fact, the Internet is a conglomerate of many global, regional, university and institutional networks, as well as networks serviced by commercial providers.
The Internet consists of many thousands of corporate, scientific, governmental and home computer networks. Combining networks of different architecture and topology has become possible thanks to the IP protocol (Soc. From English. Internet Protocol) and the principle of data packet routing.
Protocols are special standards that provide co-capacity of programs and data (protocol support programs) and hardware (hardware protocols) in the interaction of computers in networks. Program support programs are often called simply "protocol", and hardware protocol support functions are physically full of special devices - interfaces (connectors, cables, etc.).
Main international standard network interactionsadopted in 1983 is the basic seven-level reference model Relationships of open systems. It was named TCP / IP Protocol (Trans-Fere Communication Protocol / Internet Protocol). Each level in the model corresponds to various network operations, equipment and protocols. Protocol IP was specially created by the agnostic in relation to physical communication channels. That is, any system (network) of digital data transmission, wired or wireless, can transmit Internet traffic. At the dishes of networks, special routers (software or hardware) are engaged in automatic sorting and redirection of data packets based on the recipient IP addresses of these packages. The IP protocol forms a single address space on the scale of the whole world, but each individual network may exist their own address subspace, which is selected based on the network class. Such an organization of IP addresses allows routers to uniquely determine the further direction for each smallest data packet. As a result, there are no conflicts between individual networks of the Internet, and the data is unhindered and accurately transmitted from the network to the network throughout the planet and neighbor.
The IP protocol itself was born in discussions within the IETF organization (Sokr. From English. Internet Engineering Task Force, Task Force - a group of specialists to solve specific task) Whose name can be freely translated as a "group to solve the design tasks of the Internet." IETF and its working groups to this day are engaged in the development of the World Wide Network Protocols. IETF is open to public participation and discussion. The organization's committees publish the so-called RFC documents. These documents provide technical specifications and accurate explanations on many issues. Some RFC documents are elevated by IABAR (Sokr. From English. Internet Architecture Board - Internet Architecture Council) to Internet Standards Status (English Internet Standard). Since 1992, IETF, IAB and a number of other Internet organizations enter the Internet Society, ISOC). The Internet Society provides the organizational basis for various research and advisory groups engaged in the development of the Internet.
In this paper, we turn to the information resources of the Internet. The purpose of the work will be the consideration of existing Internet resources. As basic tasks, we note:
· Review of resources email;
· Consideration of the resources of the WWW protocol;
· Consideration of other resources and opportunities.

Internet Information Resources
The Internet provides us with many possibilities and resources of different kinds. Let us turn to the consideration of the information resources.
Email Email (English Email or Email, Sokr. From Electronic Mail) - Name of technology and providing services for shipment and receipt electronic messages (called "letters") on the distributed (including global) computer network. The main difference from other messaging systems (for example, services instant messages) It is distinguished by the possibility of deferred delivery, developed (and confusing due to a long-term development time) system of interaction between independent mail servers.
Email is one of the most popular and already necessary Internet services. An electronic correspondence exchange system is similar to the usual (paper) email exchange system. However, the possibilities provided to the Internet allow us to organize correspondence in such a way that the process of working with emails becomes an effective and interesting occupation. The main attractiveness of email is its effectiveness. However, there are other advantages of this type of communication:
The simultaneous presence of both subscribers is required for communication with each other;
Saving an empty copy of the message in such a way that it can be transmitted further, and may also become an object of automated computer processing;
The message at the same time can be sent to several subscribers;
The message may include data files containing non-integted information;
Email, or E-Mail, is a powerful tool by which the user can forward to another user who has an email address, all that can be created using a computer. Email messages typically include text, graphics, attached files, audio and video. Emails are easy:
read and destroy;
read and save;
read and give an answer;
edit and save or forward to another person;
Print.
Email is convenient yet for the dialogue, which may also record the exchange of messages according to a particular topic, reflecting, thus, the "question history".
Email format
The message transmitted by email is issued in accordance with international standards. The mandatory element of the e-mail is the postal address of the subscriber who is addressed to the letter, i.e. address of the recipient. Email It consists of a header, a peculiar envelope, and the next message immediately behind it. The message header has the following main fields:
From: The name of the sender and its email address.
To: The email address of the recipient (required field).
Copy: Addresses of those who are directed a copy of this message.
Hidden: addresses of those who are directed hidden copy This message.
Subject: Message theme.
Date: Date and time to send a message.
Header lines from and date are usually generated automatically software postal system. The line the theme defines the subject of correspondence, if the user has not filled this line, it can be formed automatically, for example, be transferred from that letter to which the user gives an answer (with the addition of the prefix).
Not all these lines must be present in the title. In addition, the title may contain some service lines that are used. postal system For special needs.
Mailboxes
In the email system for each user, the administrator creates a separate mailbox.
Notice
Email systems can notify recipients that the message was received in their name. In this case, the recipient's computer gives sound, visual or the other signals at the same time.
Confirmation of reception
The email program can inform the sender that whether the message sent to them was received and read.
Answer
Most e-mail systems provide the addressee the ability to answer the message by simply clicking the response button without entering the full e-mail address. Users can save messages from people with whom they are often associated, and do not take care of the details of the addressing, if in the future there will be a need to communicate again.
Attached files
Modern email systems allow users to attach not only text files. Attachments may include spreadsheets, databases, graphics, video and audio recordings.
Email etiquette
Working with e-mail involves a large number of people in cooperation with each other. Therefore, when working with e-mail, it is recommended to comply with some simple rules that protect the interests of the sender and the addressee.
When corresponding, follow the rules for decent communication. Email is not anonymous and a message source can be easily calculated.
It is recommended to specify the subject of the message. This will allow the recipient to sort its correspondence.
Read your post. We regularly view the mail coming. It is impolitely in relation to senders to save messages without answering them. In addition, information quickly stirs and you can miss something.
Do not request confirmation of receipt without a special need.
Use marks about the importance of the communication only in case of its actual importance.
The overall development of email was through the development of local interaction of users on multiplayer systems. Users could, using the Mail program (or its equivalent), send each other's messages. The next step was to be able to send a message to the user on another machine - this was used to specify the machine name and username by car. The address could be recorded in the form of Foo! Joe (Joe user on the Foo computer). In the case of using UUCP, the user's address included the route to the user through several intermediate machines (for example, Gate1! Gate2! Foo! Joe - a letter for Joe through the car Gate1, Gate2 on the FOO car). The disadvantage of such a addressing was that the sender (or the administrator of the machine on which the sender worked) it was necessary to know the exact way to the destination car.
After the distributed global DNS name system appears, domain names have become used to specify the address - [Email Protected] - User user on Example.com machine. At the same time, the concept of "on the machine" took place: the selected servers were used for the mail, which did not have access conventional users (only administrators), and users worked on their cars, and the mail came not on the working machines of users, but on the mail server, from where users took their mail on various network protocols (among distributed on currently - POP3, IMAP, RCP, web interfaces). Simultaneously with the advent of the DNS, a system for reserving the work of mail servers was thought out, and the domain name in the mail address ceased to be the name of a particular computer and became simply a mail domain for which many servers could respond (perhaps physically placed on different continents and in different organizations).
In addition, there were other email systems (some of them exist now), somehow Netmail on the Fidonet network, X.400 in X.25 networks. Access to them from the Internet and is back through the mail gateway.

WWW Information Network Each resource in the Internet has its own location identifier, or URL (Uniform Resource Locator). The URL sets the server to which you need to contact, as well as the access method and location of the resource on the server.
The URL consists of several parts: the protocol used; colon; resource address.
MICROSOFT WWW-Server HTTP: //WWW.Microsoft.com address
HTTP letters indicate the protocol used. Line residue: //www.microsoft.com - computer address.
Microsoft FTP Server Address: FTP://FTP.microsoft.com
Gopher Server Address: Gopher: //gopher.microsoft.com
Domain system names.
In addition to the URL, each computer in the Internet, i.e. The host computer connected to the physical network has a unique IP address (IP - Internet Protocol). It consists of four sets of numbers, separated by dots: 198.46.8.34.
Since these numbers are hard to remember and dial without errors, a domain name system (DOMAIN NAME SYSTEM, DNS) was created, in which the computer is identified in the System.Domain form, where the system is the name of the computer, and Domain denotes the structure in which this computer enters. The domain name system allows you to assign short-understandable names to IP addresses to determine the location of the computer.
In the example from http://www.microsoft.com domain name - www.microsoft.com. The part of the full name before the first point is the "personal" name of the computer or the resource type, and the rest is the name of the structure (domain), which consists of subdomains (subdomain), whose names are separated by points. The last three letters of the DNS address indicate the domain type.
Domain name structure.
Upper domain or upper level There are two types: geographic (territorial) and type of institution. The second type of domains for the USA - Six:
.com commercial organizations
.edu educational institutions
.gov government agencies (except military)
.mil military organizations
.net Service centres Internet (network service providers)
.org organizations (all others)
Examples of international domain designations:
.by Belarus
.ru Russia
.ua Ukraine
.pl Poland.
.au Australia
.fr France
.uk United Kingdom
.de Germany
Let us give an example of the address:
www.microsoft.com - the address of the computer that supports the MICROSOFT www server.
WWW is one of the most popular Internet information services. Two main features distinguish WWW: use of hypertext and customer opportunity to interact with others internet applications.
Hypertext - text containing links with other texts, graphic, video or sound information.
Inside the hypertext document, some fragments of text are clearly highlighted. Specifying on them with, for example, the mouse allows you to go to another part of the same document, to another document in the same computer or even on documents on any other computer connected to the Internet.
All WWW servers use special hTML language (HyperText Markup Language is a hypertext markup language). HTML-Documents are text files in which special commands are built.
WWW provides network access to both clients requiring text mode and customers who prefer work in graphics mode. In the first case, Lynx is used, in the second - Mosaic. The hypertext displayed on the screen is a combination of alphanumeric information in various formats and styles and some graphic images - pictures.
Communication between hypertext documents is carried out using keywords. Having found a keyword, the user can go to another document to get additional information. new document Also will have hypertext links.
Working with hypertexts is preferable to the client's workstation connected to one of the Web servers than on the tutorial pages, therefore the stated material can be considered the first step towards the knowledge of the WWW service.
Working with a Web server, you can perform remote connection Telnet, send email to network subscribers, get files using FTP -anonym and execute a number of other applications ( applied software) Internet. This makes it possible to read the WWW integral service of the Internet.
Creating www pages. As creating your own WWW server is complex and expensive, then many users internet Can post their information on existing servers. Own pages WWW can be created using such tools as Microsoft Internet Assistant for Word and Netscape Navigator Gold. Microsoft Internet Assistant Page Editor is a macrossetset, which creates HTML documents.
In dialogue, the user can create its own document. The editor provides:
input of the document header;
inset graphic image or video phrase;
inserting hypertext reference;
Bookmark insert;
View www pages.
The editor embedded in Netscape Navigator Gold navigator contains the means to work with the Java language. This language allows you to interpret the programs obtained from the network on the local user computer. Java - Language of object-oriented programming. It is used for the advanced method of creating applications for the Internet - programming applets (applet - small application). With the help of the applets, you can create dynamic Web -swave.
Service Gopher.
This Internet service performs functions similar to WWW. All information on the gopher servers is stored as a data tree (or hierarchical menu system). The Gopher's initial directory is the top of this tree, and all other directories and files are submitted to the menu items. The line of the main menu is either a submenu or a file.
Gopher supports different types Files - Text, Sound, Software, etc.
Teleconference Usenet.
The usenet system was designed to move news between computers around the world. In the future, it was almost fully integrated into the Internet, and now the Internet provides the distribution of all its messages. Usenet servers have means to separate teleconferencing on topics.
Teleconference - Discussion groups included in Usenet.
Teleconferences are organized by a hierarchical principle, and for top-level seven main columns are chosen. In turn, each of them covers hundreds of subgroups. A tree structure is formed, resembling the organization of the file system. From among the main columns should be allocated:
Sot - themes associated with computers;
SCI - topics from the field of scientific research;
NEWS - Information and News Usenet;
SOC - social topics;
Talk - discussions.
There are also special headings and regional division of teleconferencing.
Manage access to Usenet service Special programs that allow you to select newsgroups, work with messaging chains and read messages and answers to them. These programs perform such a function as a teleconference subscription. If the user does not enter any restrictions, then the default subscription to all teleconferences, with which its host-computer connection has. The program also allows you to make a thematic selection and provide a user with messages according to its destination.
With the participation in any teleconference, any subscriber can send your message to the topic of interest.
There are two ways to perform this procedure:
sending a direct response to the author of the article at its email;
Providing your communication to all participants in the teleconference.
The second method is indicated by the term "Follow - Up".
After e-mail USENET is the most popular Internet global network service.
File transfer using the FTP protocol
Appointment of email - First of all, the exchange of textual information between different computer systems. No less interest for users of the Internet network represents the exchange of individual files and all programs.
In order to move data between different operating systems that can be found in the Internet, the FTP protocol (File Transfer Protocol) is used independently of the equipment used. The protocol provides a method for moving files between two computers and allows the Internet Subscriber to get a set of files at its disposal. The user gets access to various files and programs stored on computers connected to the network.
The program implementing this protocol allows you to establish a connection with one of the multiple FTP servers in the Internet.
FTP screen is a computer that contains files intended for open access.
Program FTP-Cleate Not only implements the data transfer protocol, but also supports a set of commands that are used to view the FTP server directory, search for files and managing data movement.
To install communication with the FTP server, the user when working in UNIX or MS DOS must enter the FTP command, and then the address or domain name it.
If the connection is set, you will prompt enter the username. A user who is not registered on the server can be introduced by the name "Anonymus" and will receive access to specific files and programs. If a password is requested, you can enter your email address. The invitation received after performing these procedures allows you to work with FTP screen.
The main file transfer mode is transmitted in the ASCII code. To transfer binary files, you must enter the binary command. To determine the active mode, you must enter the STATUS command.
Since most FTP servers running operating unix systems , the technology of work in this system requires the introduction of commands from command line Computer and somewhat makes it difficult to user actions in this mode.
The Windows 95 operating system allows you to work with the WS _ FTP program, which provides a more convenient way to work with FTP servers. Another way of work is based on the use of WWW navigators, such as Microsoft Internet Explorer. , Netscape Navigator.
Information technologies of e-business Today we are witnessing the birth of a new sector in the economy, which is increasingly called e-business, Internet economy, Internet business, e-commerce (EC). The pace of development of this sector is high, its turnover is twisted every year. According to the E-Commerce Study Center, which is operating under the auspices of the Higher School of Business University of Texas, the total income of companies offering services via the Internet, as well as engaged in technical support Networks, exceed 500 billion dollars. Many firms use the World Wide Web (Web) as the transport environment for commercial and financial operations.
On the world market of Internet commerce dominate the US (approximately 73% of the total turnover). Europe accounts for only 16%, and 7% for Asian countries, all other regions are 4%.
The share of the EC market not only in Eastern Siberia, but also in Russia is small, therefore it is too early to speak about the economics, although all modern e-commerce species already exist in Roshi.
First of all, it is necessary to decide on the concept of e-commerce. There are several e-commerce definitions. On the one hand, this is obtaining profit from making economic activities to provide new types of electronic services, sales of computer equipment and software. On the other hand, e-commerce means carrying out operations with partners and customers, as well as various payments and calculations using new information environments and various kinds of electronic networks. In this aspect, we are interested in a second case.
More severe definition of e-commerce is given in a special document of the US Presidential Administration, announcing a moratorium on additional taxation of transactions concluded via the Internet. In it, e-commerce (ek) is called any transaction committed through a computer network, as a result of which the ownership or right to use a real product or service was transferred from one person to another. This definition In our opinion is the most complete.
Consider the basic concepts associated with e-commerce.
Such a kind of eq as B2B (Business-to-Business) or Business Business - is an EC between enterprises, the main feature of this type of ek is automatic interaction in in electronic format Enterprise management systems.
B2C (Business-to-Consumer, Customer) or business consumer is an EC type associated with electronic commercial operations produced between the enterprise and consumers. Enterprises based on the Internet compete or cooperate with traditional enterprises in the field of retail. They function as follows. The company seller places on his Web node The interface with which the consumer can place an order in its enterprise control system. EC systems allow the buyer not to communicate with the seller, do not waste time on stores, have more full information About products. The seller, in turn, may faster to respond to change in demand, analyze the behavior of buyers, save funds on personnel, rental of premises.
The advantages of using eq can be called the following.
Easy deployment of applications and control them. Use Web is simple enough. Buyers should only master the program for viewing, and they immediately get access to electronic commerce.
Reducing the time to deliver information about the product to the consumer is one of the necessary conditions for conducting successful trading.
Reducing the number of intermediate links (intermediaries), establishment of direct communication manufacturer - buyer.
Reducing the cost of time for the purchase of the necessary goods.
An unlimited increase in the number of potential customers. When using the Internet, you can expand the sales market at the expense of foreign buyers.
You can submit information about the product in a different form. Web allows you to transmit not only text, graphics, but also a video, voice.
Ability to analyze the demand, preferences for planning its activities.
Ability to identify the buyer.
Reduced personnel costs and rental of premises.
The possibility of round-the-clock access.
If in the west of the delivery system, payments, trade in catalogs, enterprises, and EC standards and EC standards have been developed, then we all are in the stage of birth. In total, in the Internet-Ta segment covering the CIS countries, there are more than 600 sites, they can be seen in the catalog on the website Magazin.ru offering various paid services. Note that most of them e-commerce, in the strict sense of the word, do not behave, as they are not integrated with the enterprise automation system, do not allow online payments, require the participation of the manager on certain phases of the purchase.
In any country, if Internet users are less than 10% of the population, develop the direction B2C is very difficult. In Russia, this figure is January 1, 2003. amounted to 4.2%, about 10% in Moscow. Creating a full-fledged online store is at least 10 thousand dollars. Many companies have no such money, but they can use the services of such firms as Ayto and Tops, which are offered to rent a complete infrastructure for opening online stores on their "trading orders "(www.imbs.ru, www.ipassage.ru). Rent a store in "Trading Rows" Tops costs $ 150 per month.
Electronic stores are not the only way to provide services via the Internet. Popular auctions, financial, banking services, tourist, medical, insurance, paid information services, Online payment of bills. 1999 was marked by the flourishing of Web auctions. For example, 3 million auction transactions were concluded on EBay, on Yahoo - 1 million. The turns of the domestic auctions (www.molotok.ru, www.stavka.ru) are still small, and the prices for them are slightly lower than in stores.
Financial and banking services in the Internet are represented by several directions: Internet sales of securities, telephanking, online provision of mortgage loans, etc. Like other electronic business spheres, this sphere is developing rapidly. Online services offer almost all US banks, the British Telecom reports are not bad in Germany and France. Significantly lagging behind in the pre-office of Internet services Bank of Great Britain, at the beginning of 2000. There were only 10 banking Web nodes.
The transfer of insurance services to the Internet is still very slow, insurance companies are reluctant to invest in the Internet.
Currently in the Russian part of the Internet, the EC model prevails focused on the consumer market, i.e. B2C, but there are also interesting solutions that can be attributed to the B2B model.

Conclusion in the industrial society, where most of the efforts are aimed at material production, several basic types of resources that have already become classical economic categories are known: material, natural, labor, financial, energy.
IN information society The emphasis of attention and significance is shifted to the traditional types of resources to the information resource, which, although always existed, was not considered any economic, nor as a different category; No one specifically spoke about him and especially no longer introduced any definitions.
One of the key concepts in the informatization of society was the concept of "information resources", interpretation and discussion of which was conducted from the moment when they began to talk about the transition to the information society. This issue is devoted to quite a few publications, which reflected various opinions and definitions, and various scientific schools, considering these concepts.
With the adoption of the Federal Law "On Information, Informatization and Information Protection", most of the uncertainty was removed. Guided by not the scientific side of this issue, but rather the pragmatic position of the consumer of information, it is advisable to take advantage of the definition that is given in this law. All the more, it is impossible not to take into account the fact that legal interpretation in all cases is for the user's information support when protecting its rights.
Information resources are separate documents and individual arrays of documents, documents and arrays of documents in information systems (libraries, archives, foundations, data banks, other information systems).
Currently, a methodology has not been developed for a quantitative and qualitative assessment of information resources, as well as predicting the needs of society in them. This reduces the effectiveness of information accumulated in the form of information resources, and increases the duration of the transition period from the industrial society. In addition, it is not known what scope of labor resources should be involved in the production and dissemination of information resources in the information society. Undoubtedly, in the future these problems will be solved.
Information resources of the country, region, organizations should be considered as strategic resources similar to the importance of raw materials, energy, fossil and other resources.
The development of world information resources allowed:
turn information on the provision of information services into global human activity;
form the world and domestic information services market;
to form all kinds of resource databases of regions and states to which is possible relatively inexpensive access;
Increase the validity and efficiency of accepted decisions in firms, banks, stock exchanges, industry, trade, etc. due to the timely use of the necessary information.

List of sources used 1. Applied informatics, articles on computer science, email. - [Access mode] - http://priinfo.net/publ/9-1-0-9.
2. Applied informatics, articles on computer science, Internet names. - [Access Mode] - http://priinfo.net/publ/9-1-0-4.
3. Archipova Z.V., Parhomov V.A. Information technology in the economy: studies. benefit. - Irkutsk: Publishing house BSUEP, 2003 - 184 p.
4. Informatics / Ed. Prof. N.V. Makarova. -M.: Finance and Statistics, 1997. - 768 p.: Il.
5. Informatics. Basic course / Simonovich S.V. and others - St. Petersburg: Publisher "Peter", 2000. - 640 p.: Il.
6. 6. Ostrovsky V.A. Informatics: studies. For universities. M.: Higher School, 2000. -511 C.: IL.

Tools for providing certain information services for network users, it is customary called internet services.In addition to the concept of "service" there is still the concept of "service". Often the difference between them is quite difficult to catch. The number of different services and services in the network is continuously growing. We describe only some of the most famous services, dividing them to communication and information.

Once again, let's pay attention to the fact that all Internet services are based on the interaction of two programs. One of these programs - Server, and the other Program - Client.. They interact on a specific rules specified in the protocols

Service Protocol- technical Standard (rule system) that determines the technical features of the interaction of mail servers with each other and with the postal client.

If the TCR protocol /I. R is called the basic Internet protocol, then the service protocols can be called application protocols (sometimes they are called second-level protocols).

Let us explain the meaning of two more terms that will be used further. Mode oN.- line - this is the mode of operation of the user in a state of connecting to any network server. The disconnected communication state is called mode about fF.- line. Analogy: communication on the phone always occurs in modeoN.- line. When sending a telegram, you fill out the form in mode about fF.- linethen the telegraphist in modeoN.- line transmits telegram on the communication line; And then the recipient reads a telegram in mode about fF.- line.

Communication services Internet

Email Service - E. - mail . This is the oldest and one of the most popular network services. It is designed to exchange text messages between remote partners.

Email operation scheme is reflected in Fig. nine.

Fig. 9. Email operation scheme.

Mail server - A program that ensures the work of the Internet service. This is a kind of post office where the incoming and outgoing correspondence of users registered on it is received.

Mail client - The program installed on the user's computer and ensuring interaction with the mail server.

Email message - logical set of data having a structure. defined protocol used. Email message is not a file! More specifically submit it as a database entry.

Email folders - These are logical structures designed to streamline the storage of email messages. Their destination is only one thing - make access to messages more convenient.

Post attachment - Mechanism for shipping with email messages of arbitrary files.

Electronic "mailbox" - this section of the external memory of the mail server, allotted for the subscriber.

Each user receives a personal mailing address for which letters will flow to it.

E-mail address - Record, unambiguously determining the path to the electronic "mailbox" of the destination. The email address is written according to a certain form and consists of two parts separated by @ symbol:

User _ Name @ Server _ Name.

The sign @, in the spaciousness is called the "dog", in fact it is called "Commercial AT (ET)". The first part of the postal address (User _ Name. - Username) has an arbitrary character and sets the user by the user when registering the mailbox. The second part of (server _ Name. - Server name) is a domain name of the mail server on which the user has registered its mailbox.

The process of sending a mail message is similar to the Telegram Transmission Process described above. First, the user is in mode aboutfF - Line writes the text of the letter, indicates the address of the recipient. This uses a letter preparation editor included in the email client program. Prepared letters are placed in the "Outgoing" folder. Then the connection with the server is then set. Next occurs automatic operation in moden - Line : The password server defines the user, accepts all letters from the Outbox folder, transmits received letters that are placed in the "Inbox" folder. Communication session is completed. The outgoing folder has become empty, sent letters are preserved in the "Sent" folder. If a switched telephone line is used, the user turns off telephone communication. After that, he can slowly look through the received mail.

The mail server works constantly. It periodically browsing "mailboxes" and organizes transmission over the network of outgoing letters. Incoming correspondence mail server decides on "boxes".

The client program, in addition to the receiving and transmission function of letters during a communication session, performs many more service functions: preparation and editing of letters, organization of the address book, viewing the postal archive, sorting and removing letters from the postal archive, etc. The popular client ismail Is programOutlook.Expressincluded in the standard supply of the operating systemWindows.

Anyone Internet user can register a mailbox on one of the Internet servers, which will accumulate transmitted and received emails.

To work with email you can useWeb -Technology. Web. -sites offer everyone to register a free mailbox (for example, at:http: // mail. RU).

The advantage of such mail is that special postal programs are not required to work with it. Mailing can be done using any browser after loading the appropriateWeb. -pages. Messages are grouped by folders, you can send messages with nested files, simultaneously to several subscribers and so on. Essential featureWeb. - Wheels are that all messages are constantly stored on a remote server, and not on the local user of the user. For new users, the registration procedure is proposed.

Email's wide popularity has won because he has several serious advantages over usual Mail:

- sending speeds;

- an email can contain not only a text message, but also invested files (programs, graphics, sound, etc.). But it is not recommended to send by mail too big filesSince it slows down the network. To do this, on some mail servers, restrictions on the size of the sent messages are entered.

In addition, email allows you to:

- send a message to several subscribers at once;

- send letters to other addresses;

- delivery of email messages occurs almost free;

- include an answering machine, all incoming letters will automatically be sent reply;

- create rules for performing certain actions with the same type of messages (for example, delete advertising messages coming from certain addresses) and so on.

Teleconference service. The teleconference service is intended for an open discussion of issues of common interest.

This is also a postback. But if you email your letter to some one person personally, then in teleconferences, the letter is sent simultaneously to all participants in the conference. In turn, all messages that enter the conference will enter your mailbox and boot into the computer during the communication session. To become a member of the conference, it is necessary to subscribe to it (register). When registering, each conference participant receives a unique name (Nic. ) and password to enter the conference.

Any conference is dedicated to a certain topic, so the correspondence in it occurs only within the framework of the topic. According to some data, the number of current conferences on the Internet exceeded 500,000.

Teleconference service is called differently: newsgroups, serviceUsenet. . On the network nodes, teleconference serves the news servers. On the user's PC, the news client must be installed. The program mentioned aboveOutlook Express. is at the same time postal client and news client.

Teleconferences are combined in both communication and information functions. On the one hand, personal communication takes place here, with the arc - conference materials contain a large volume useful informationwhich is stored for a certain time on the server and can be considered as some information resource (electronic newspaper). This is especially important for professionals participating in professional topics: science, manufacturing, business, trade, etc. In the conference materials, you can find valuable advice, advice that will help in making important decisions.

The name of the teleconference consists of several words, separated by dots, consistently narrow theme.

Most conferences are regulated by a special editorial board called moderator. The duties of the moderator include the viewing of the Epistle and the decision to publish these messages (send them to the participants of the group) or not.

Example. Some standard designations of teleconferencing:

- comp - a conference where everything is discussed with computers and programming;

- sCI - everything related to science;

- rec. - Recreation, hobbies, hobbies;

- talk - This group is designed for lovers to argue.

Forums Direct Communication - IRC (Internet Relay Chat)

Recently, interactive communication on the Internet in real time is increasingly spread. The increased data transfer rate and the increased performance of computers provide users with the ability to not only share text messages in real time, but also to carry out audio and video communications.

Literally transferchat. - "chatter" in real time (chat. conference). Communication between participants occurs in modeoN - LINE in writing. Like teleconferences, participantschat. Conferences are divided into thematic groups.

On the knotting computer workschat. -Server on user PC -chat. -client. There are many different customer software that distribute free over the Internet. As in teleconferences, participantschat. Conferences are registered (subscribed) in a specific thematic group.

This service is most interested in young people. Communication in the "chat" they turn into a kind of game in which each participant usually comes up with some "image" for itself and beats it. Between the participants of the Chat, it is not customary to emerge for real communication. However, the Chat service can also be used for serious communication - both collective and one-on-one.

If your computer, as well as interlocutors computers are equipped sound card, microphone and headphones or acoustic speakers, then you can exchange sound messages. However, the "alive" conversation is simultaneously possible only between two interlocutors.

In order for you to see each other, that is, exchange video images, video cameras should be connected to computers. Conventional analog camcorders are connected to special video plates, and digital cameras - To the parallel port of the computer.

Of course, the sound quality and images to a large extent depends on the speed of the modem and bandwidth Communication channels that should be at least 28.8 kbps.

For the organization of interactive communication, special software is required (for example, the programNetMeeting. which is part ofInternet Explorer).

In recent years, has acquired great popularity interactive communication through servers ICQ. (This three-letter abbreviation is formed from the consonance of the words "Iseek You "-" I'm looking for you ").

Currently in the systemICQ. More than 200 million users are registered, each user has a unique identification number. After connecting to the Internet, the user can start communicating with any system registeredICQ. and connected B. this moment to the user. The program notifies the presence of the subscribers from the preliminary compiled list on the Internet (MY CONTACT LIST. ) And allows you to initialize contact with them.

In order to become a subscriber of the systemICQ. , just download the programICQ. -clin from the file server and in the process of installing it on the computer to register.

Interactive communication systemICQ. Integrates various forms of communication: email, text messaging (chat. ), Internet telephony, file transfer, search in people and so on.

Internet telephony - voice communication via the network in modeoN - LINE . This is a new, developing service. Its main advantage over the phone is low price. Quality is still inferior to telephone communication (time delays, sound distortion) However, there is no doubt that over time this deficiency will be overcome.

Internet telephony allows the user to use the phone with a phone, computer-computer and phone-computer. Internet telephony providers provide such a connection using special Internet telephone servers that are connected to the Internet and to the telephone network.

Mobile Internet . FROM mobile phone On the computer connected to the Internet and from a computer to a mobile phone can be sentSMS (Short Massage Service ) - short text messages).

For wireless access from mobile phones to information and Internet service resources, the protocol is usedWAP (Wireless Application Protocol ). To work on the Internet for this protocol is not needed additional devices (computer and modem), just one mobile phone with supportWAP.

WAP. -Sype are located onWeb. -server and presented in a special formatWML (Wireless Markup Language ). This markup language is specifically adapted for mobile phone capabilities - two-color graphics, small screen and a small memory.

W. AR sites contain a variety of political, economic and sports news, weather forecast, currency exchange and so on. You can also sendmail and take part inWAP are.

Full high-speed Internet access from a mobile phone can be carried out by technologyGPRS (GENERAL PACKET RADIO SERVICE ). In this case, you can work withWAP. -sites directly from a mobile phone, and on a computer connected to it can be viewed by NTML. -Rearters, pump files, work with email and any other Internet resources.

In GPRS technology The maximum possible data transfer rate is 171.2 kbps - this is approximately 3 times the speed of access by switching telephone lines, and almost 12 times the data rate in mobile phone networks of the standardGSM (9.6 kbps).

Information services Internet

ServiceWorldWideWeb.. This service manages the delivery and display of integrated information documents on the user's computer.

This is a fairly new service compared to email. It was founded in 1993. VerbatimWww Translated as a "World Wide Web". To dateWww This is the most interesting information resource - hypertext navigation system.

Navigation system - This is a set of programs that allow the user to navigate throughout the diversity of information posted on the network, and find the actual data you need, useful programs.

Hypertext - The system of interrelated texts. Communication occurs through hyperlinks.

Hyperlink -this is some keyword or object in the document with which the pointer is associated to go to another page in the web. Typically, the image of the hyperlink somehow stands out on the page, such as color or underlining. When summing up a mouse pointer hyperlink, he takes a point of hand with a pointing finger. If you click on the left mouse button, it will go through the pointer to the associated document.

Web.-page -a document that has its own address. It can contain the most different information: text, drawing, sound recording. Each page is kept in separate filewhose name has an extension.hTM or. HTML

Web.-website(other name -Web.-Hell) -this is a combination of interrelated pages belonging to a single person or organization.Web. -site is organized byWeb. -Server network service provider. Every site has main page,being a kind of title page of the site. As a rule, the main page represents the site owner and contains hyperlinks to different sections.

Protocol,which is used by the serviceWww , called NTTR (HYPER TEXT TRANSFER PROTOCOL - Hypertext transmission protocol). Its main purpose is handling hyperlink, search and transferring documents to the client.

TechnologyWww Allows you to create links that implement transitions not only within the source document, but also to any other document on this computer and, most importantly, on any document of any computer currently connected to the Internet.

Fig. 10. Technology www.

Already described about the addressing system in the computer space network. itI. R addresses, domain addresses. The Internet information resource space uses its addressing system. To findWeb. -Refront or file on the Internet can be using universal pointer resources URL Uniform Resource Locator)

Each Web. -Rapture or file have their own uniqueURL -press, which consists of three parts: the name of the protocol used to access the protocol; the name of the server on which the resource is stored; Full file name on the server.

Protocol: // domain_name / path / file_name

Example.http: // scools. Keldysh. RU / INFO 2000 / INDEX. Htm.

It consists of three parts:

http. : // - Access Protocol;

scools. Keldysh. Ru - Domain server name;

/ INFO 2000 / INDEX. Htm. - path to the file and file name.

ServiceshowsfilesFILE TRANSFER PROTOCOL - FTP).

Information services provide users with access to certain information resources stored on the Internet. Tens of thousands of Internet servers are file archive servers,and hundreds of millions of files of various types (programs, devices drivers, graphic and sound files, and so on) are stored on them. The presence of such file archives servers is very convenient for users, since many of the necessary files can be "download" directly from the Internet.

Access to files on file archives servers are possible both via the NTTR protocol and by the Special File Transfer Protocol.F tr. Protocol F. TR allows not only to upload files (Download ) from remote file archive servers on local computer, but, on the contrary, to transfer files (Upload ) from the local computer to the remoteWeb server.

Often this service is called the name of the protocol used -FTP. . On the part of the network, the service is providedF. Tr-servers, and from users -F TP clients.

After the connectionF. Trp client with the server on the user screen opens file interface storage of folders and files on the server (like the conductorWindows ). Further, the work occurs just like with the file system on the PC: folders and files can be viewed, sorting, copy to your discs.

Search services.

The World Wide Web Sufficient unsystematic. Search I.norma is becoming a serious problem. The only coordinateWeb. -Document is itURL-Press. However, URL -press is not connected with the content of the document.

In search of information inWww The user helps internet search service. It lies in the services of search servers.

According to the principle of operation, two types of search engines are distinguished: search catalogsand search pointers.Some search engines combine both principles of operation. Search catalogs

The organization of work with catalogs is quite simple. On the pageWeb. -sight usually contains list certain columnsEach of which is connected by a hyperlink with other links where there are either a subhead list, or a list of documents corresponding to the specified heading. The contents of search directories are formed by manually by specialists serving this service.

The search is conducted within the framework of the themed hierarchy of categories. On the main page The search directory is a list of basic thematic sections. The category of the lowest level contains a list of documents by the selected topic.

The main advantage of search directories is a high degree of compliance of the documents found given the topic. The disadvantage - it is impossible to obtain comprehensive information about network resources. CatointedWeb. -Spare documents is less than 1% of the totalWeb. -Spare documents.

The most popular Russian catalogs include: the first Russian catalogRASSIA ON THE NET (HTTP: / www. RU ). One of the largest Russian-speaking directoriesList - RU (http: // www. List. RU).

Search signs

Search pointers (search engines) are automatically compiled. Special programs In automatic mode viewWeb. -Sype and indexWeb. -documentation. A huge reference point is formed. It allows you to quickly find addresses of documents containing certain keywords. The user specifies the words that should be contained in we need document. Search pointer issues a listweb. -documents satisfying the query. You can open any of these documents by clicking on the hyperlink.

The advantage of search pointers is the breadth of coverage. The information collection mechanism works very effectively. Information about new documents falls into the search pointer pretty quickly.

The lack of search pointers is a large number of "unnecessary documents" in the search results. Any keyword can meet in a variety of documents. These documents may fit in the desired topic, and may not have a relationship to it. The use of rare terms or multiple keywords simultaneously reduces the total number of documents found.

The search quality depends not only on the capabilities of the most search engineBut from user skills effectively formulate their requests.

Currently, the total volume of indexedWeb. -Spare exceeds 50% of totalWeb-space.

WORLD COUNT WORLD COUNT (WWW) is a service for accessing network users to information resources stored on computers in different parts of the world. The basis of WWW are Web pages and Web sites. Task 1. The table shows requests to the search server. To designate a logical operation or in queries, a symbol is used |, and for a logical operation and - symbol &. 1Prance | Spain | History 2Prance & Map & History 3Prance | History 4Prance & History Picture a graphically number of pages that will find a search server for each request. Position request numbers in descending order of the number of pages.

Answer :) 2) 3) 4) France Spain History France History France History Map Let's solve the task 1Prance | Spain | History 2Prance & Map & History 3Prance | History 4Prance & History

The address of the document on the Internet - its URL (Uniform Resource Locator - the universal resource pointer) consists of the following parts: the domain name of the server with the sign / at the end of the name the full name of the file on the server, where it is the name of the protocol with signs: // at the end of the name Consider Example address (URL): fcior.edu.ru/ card / 701 / algebraicheskie-uravneniya.html Recording Indicates that this is a Web page (HTTP Protocol - Hyper Text Transfer Protocol - Hypertext File Transmission Protocol). The domain name of the server on which the page is stored. The full name of the file, including the path to the file, i.e. all the directories that should be sequentially logged in to open the desired file. The address of the document on the Internet

A.NET BFTP Q: // HTTP D / E.ORG HTXT solution. The first part of the file address is the name of the protocol: GV Txt.org same / ftp dB.NET and the second part of the address is the server name (the computer on which the file is located): the third part of the address is the full name of the file on the computer: we solve the task task 2. Access The FTP.NET file located on the TXT.org server is carried out using the HTTP protocol. In the table, the file address fragments are encoded with letters from A to J. Record the address specified File On the Internet and the sequence of letters encoding this address. Answer: Gweedba.

File archives Authorization FTP General FTP operation diagram Transmission data in active mode Transfer data to the server Transferring data between two FTP servers File archives - a kind of library stored files with software, graphics, music and other information. Access to files in file archives is possible by protocols: HTTP - protocol transfer of hypertext documents; FTP is a special file transfer protocol.

FLP file archives: // com.edu/ HTM.EXE protocol serve file The file address on the file archive server includes a file access protocol, server name and full file name. Many files accepted on the FTP protocol are compressed. Their names end with the extensions of Zip, Arj, Rar, etc. after copying compressed file. It should be unpacked, that is, to restore its initial look.

Email Email () is messaging system (letters) between computer network subscribers. High Speed \u200b\u200bSpeed \u200b\u200bMessage The ability to send attached files containing graphics, sound the ability to simultaneously send a letter to several addresses The advantages of email. Any Internet user can start your mailbox - named disk area on mail server His provider, where the incoming and outgoing correspondence will be placed.

@. Name Country Name Country Email Email Address Email Email Address: The first part is selected by the user itself; The second part is rigidly connected to the server on which the user registered its mailbox. Separator between the addresses of the address serves

The sender feeds the message, indicates the address of the recipient and directs the letter to the outgoing mail server. The outgoing mail server directs a message to the address on the Internet address, the letter is transferred to the server of the incoming mail, indicated in the recipient's address, the included mail server reaches a letter to the mailbox The recipient opens his mailbox and gets access to emails received to him.

Email mail protocols use two protocols: SMTP protocol - to send mail; Rranz \u200b\u200bProtocol - for posting mail. Since sending mail is entitled to anyone and anyone, the SMTP protocol does not imply the identification of the sender. Get the letter must be exactly the one who is addressed; Here you need the identification of the recipient (login and password), which is provided by RORZ protocol. Mail Server User 1 User 2 SMTP SMTP POP

Viewing Promotional Communications Post Customer Connecting to the Internet At the time of downloading messages Access to P / I only with a computer with the installed mail client WEB-interface access to P / I, from any computer to read the correspondence you need to connect to the network Methods of viewing messages

Nowadays, a wide distribution service has been widely distributed in small text messages in real time. ICQ is the most famous program used for this purpose. Each ICQ user is assigned a personal ICQ number. Unlike email, which has the ability to postpone message delivery, messages in ICQ are transmitted in real time. Instant messaging

Network collective interaction form of collective interaction Teleconference Forum Chat Social network Information exchange system between network users. Not limited in time offers a set of sections for discussion. Real-time group communication service Interactive multiplayer Web sites

Network etiquette on the Internet There are inspired rules of behavior, the so-called network etiquette. Briefly, the essence of the network etiquette can be expressed in one phrase: "Respect your invisible partners over the network!". The basic rules of the network etiquette clearly identify yourself. Know and respect your destination. Specify the subject of the message. Write correctly, you can express emotions using emoticons Do not request confirmation of the message without needing. Do not allow spam do not hope for complete correspondence privacy.

The most important document posted on the Internet has a URL address. User access to documents posted on Web sites is possible using the HTTP protocol. File archive - storage on the Internet files with software, graphics, music and other information. Access to file archives is possible by FTP file transfer protocol. Email () - messaging system (letters) between computer network subscribers. The main forms of collective interaction are teleconference, forums, chat rooms, social networks.

Questions and tasks Describe the organization and purpose of the service such a browser? Give examples of browsers. What documents are called hypertext? The table shows requests to the search server: 1Buldog & Collie & Care 2Buldog & Collie 3Kolli 4kli | Care Ports graphically the number of pages that will find a search server for each request. Place the request numbers in descending order of the number of pages to find the search server for each request. What is URL? What is his structure? Analyze the addresses of the following documents: 1) september.ru/2007/11/9.htm 2) 3) on the EDU.ru server is the Demo.rar file, access to which is carried out using the FTP protocol. Fragments Addresses this file Enclosed with letters from A to J. Record the sequence of these letters, which encodes the address of the specified file on the Internet. A.RAR BDEMO Q: // G / DFTP E.EDU J.R.ru By what protocols is possible user access to information stored in file archives? What are the main advantages of email before ordinary mail? What is the structure of an email address? Describe an email operation scheme in general terms. Imagine what you need to contact an unfamiliar or very busy person. You managed to get a mobile phone number and email address of this person. What kind of connection, in your opinion, it is more convenient to use in this situation? Justify your answer. What are the ways to work with email messages? Analyze the advantages and disadvantages of each of them. What is general and what is the difference between the forms of network collective interaction, as a teleconference, forum and chat? What do you know about social networks? What is login? Is it possible to use the same login on different sites? What is the password? What rules should you stick when choosing a password? Why is it not recommended to use the same password on different sites? What is the main rule of the network etiquette? What is spam? Learn the story of this term.

World Wide Web (WWW) is a service for accessing network users to information resources stored on computers in different parts of the world. The basis of WWW are Web pages and Web sites. The reference audit of the FTP file transfer protocol provides access to file archives with software, graphics, music and other information. Messaging (letters) between computer network subscribers is made via email (e-mail). Teleconferences, forums, chat rooms, social networks are the main forms of collective interaction on the Internet.

Information sources 1. 7A75FEF34E81 / FTP3.SWF - FTP authorization - connections 7A75FEF34E81 / FTP3.SWF 2. C3CDCC5BA1A1 / FTP1.SWF - general work scheme FTPhttp: //files.school-collection.edu.ru/dlrstore/fb31e305-aee0 430E C3CDCC5BA1A1 / FTP1.SWF 3. D8BA87868F1D / FTP4.SWF - Data Transfer D8BA87868F1D / FTP4.SWF BFF6F / FTP5.SWF - Data Transmission in Passive Mode BFF6F / FTP5.SWF C8F9DC74 / FTP8.SWF - Data Transfer to Server 5649C8F9DC74 / FTP8.SWF C362D3A / FTP2.SWF data session between two FTP-servers C362D3A / FTP2.SWF 7. A348F7100C4E / FTP4.SWF - Data transmission A348F7100C4E / FTP4.SWF BA2361F41 / FTP5.SWF - data transmission in passive mode 538BA2361F41 / FTP5.SWF network etiquette EAF.JPG - 7EAF email logo. JPG 11. IF - Logo Microsoft-Outlook-ExpressHttp: // if

Sources of information logo Mozilla Trunderbirdhttp: //warezatut.net/uploads/posts/ / jpeg 13. Ze \u003d Article_Large logo Mail.ruhttp: // ze \u003d article_large 14. Avait.jpg - ICQHTTP logo: //images.lpcdn.ca/ 924x615 / 201106/02 / Avant-Reseaux-Sociaux-Y- Avait.jpg Envelope server computer network server

Committee of General and Vocational Education of the Leningrad Region

Leningrad Regional Institute for Education

Yurkov A.V.

Information Resources and Services

Internet online

Tutorial

St. Petersburg

Printed by decision of the Faculty of Informatization of Education
and Risa Loiro.

Reviewers: O.N.Shilova, Doctor of Pedagogical Sciences, Professor of the Russian State Pedagogical University. A.I.Getzena, M.A. Goryunova, Dean Faculty of Informatization Education

Yurkov A.V. Using information resources of the Internet. Tutorial. St. Petersburg: Loiro, 2003.

The textbook intends to introduce listeners with the structure of Internet information resources, work in standard browsers, receiving information to find information using popular information and search engines, work with email and other network servicesensuring the possibility of exchanging information and communication, as well as legal problems of the Internet.

Recommended by the educational and methodological office of information and communication technologies As a training manual for listeners to improve the skills of Loiro and district information technology centers.

 Leningrad Regional
institute of Education Institute
(Loiro), 2003

 A.V. Yurkov

What is the Internet? four

Internet navigation 4

Address Structure WWW 7

Cyrillic coding problem 8

Search for information on the Internet 8

Search engines 8.

Popular IPS 9.

Simple search 10.

Advanced Search 12.

Internet Information Resources 14

Some useful addresses 14

"Pumping" information 15

Internet and right 15

Tasks for practical work: 16

Internet services and work with them 18

Email 18.

Creating an email address 18

Creating and sending electronic messages 18

Anti-virus prevention 20.

Reception of emails. Work with the postal programs 21

Encoding problem 25.

Teleconference. Forums. Chats. 26.

Network etiquette 29.

Ethiquette rules for electronic email mail 29

Rules of etiquette for teleconferencing 30

Rules of etiquette for communication in chat 31

Work with FTP archives 31

Tasks for practical work: 34

Internet literature and resources 35

Basic information about the Internet

What is the Internet?

The Internet is a global network of computer networks connected by communication channels and transmitting information to each other according to certain rules called protocols. Conventional telephone lines can be used as communication channels. To connect a computer to the network via the telephone line, a device called a modem is used (from words Modulation / demodulation - converting digital information processed by computer into analog telephone signals). Provide access to the Internet organization called providers (from English Provide - to provide).

Birth of internetacts by 1969, when the first network was created, taking geographically remote computers. Currently, the most intensively developing information resource and the Internet service is W.orld W.iDE W.eB (WWW) or "World Wide Web", which emerged in 1993 1

The basis of the WWW system is based on four basic concepts:

hypertext;
Unified document format (HTML);
one system Addressing (URL).
programs for viewing documents (browsers);

"World Wide Web" today is not only great amount A variety of information, but also new multimedia 2 technologies for its transfer, allowing to talk about the Internet as a "virtual" reality - a new way to communicate and coexistence people.

WORLD COUNT WORLD COUNT (WWW) is a service for accessing network users to information resources stored on computers in different parts of the world. The basis of WWW are Web pages and Web sites. The presentation of information in WWW is based on the possibilities of hypertext links. Hypertext is the text containing links to other documents. It makes it easy and quick to move from one document to another. Related Documents may be scattered throughout the globe.

A.NET BFTP Q: // HTTP D / E.ORG HTXT solution. The first part of the file address is the name of the protocol: GV Txt.org same / ftp dB.NET and the second part of the address is the server name (the computer on which the file is located): the third part of the address is the full name of the file on the computer: we solve the task task 2. Access The FTP.NET file located on the TXT.org server is carried out using the HTTP protocol. In the table, the file address fragments are encoded with letters from A to J. Record the address of the specified file on the Internet and the sequence of the letters encoding this address. Answer: Gweedba.

Email Email () is messaging system (letters) between computer network subscribers. High Speed \u200b\u200bMessage The ability to forward the attached files containing graphics, sound the ability to simultaneously send a letter to several addresses. Email's advantages. Any Internet user can start your mailbox - a named disk area on the mail server of your provider, where the incoming and outgoing correspondence will be placed.

@. Username Domain Name Country Code Email Email Email Address Email Its View: The first part is selected by the user itself; The second part is rigidly connected to the server on which the user registered its mailbox. Separator between the addresses of the address serves

The sender dials a message, indicates the address of the recipient and sends the letter to the outgoing mail server. The outgoing mail server sends a message at the specified Internet address, the letter is transferred to the partner of the incoming mail, specified in the recipient's address of the incoming mail server places the letter to the recipient's mailbox The recipient opens his mailbox and gets access to the receiving it Letters of the Email Scheme

Questions and tasks Describe the organization and purpose of the service such a browser? Give examples of browsers. What documents are called hypertext? The table shows the search server requests: 1 Bulldog & Collie & Care 2 Bulldog & Collie 3 Collie 4 Colli | Care Ports graphically the number of pages that will find a search server for each request. Place the request numbers in descending order of the number of pages to find the search server for each request. What is URL? What is his structure? Analyze the addresses of the following documents: 1) september.ru/2007/11/01. HTM 2) HTML 3) HTML On the EDU.ru server, there is a demo.rar file, access to which is carried out using the FTP protocol. Fragments of the address of this file are encoded with letters from A to J. Record the sequence of these letters, which encodes the address of the specified file on the Internet. A.RAR BDEMO Q: // G / DFTP E.EDU J.R.ru By what protocols is possible user access to information stored in file archives? What are the main advantages of email before ordinary mail? What is the structure of an email address? Describe an email operation scheme in general terms. Imagine what you need to contact an unfamiliar or very busy person. You managed to get a mobile phone number and email address of this person. What kind of connection, in your opinion, it is more convenient to use in this situation? Justify your answer. What are the ways to work with email messages? Analyze the advantages and disadvantages of each of them. What is general and what is the difference between the forms of network collective interaction, as a teleconference, forum and chat? What do you know about social networks? What is login? Is it possible to use the same login on different sites? What is the password? What rules should you stick when choosing a password? Why is it not recommended to use the same password on different sites? What is the main rule of the network etiquette? What is spam? Learn the story of this term.

Information resources and services. Information resources and network services Internet Tutorial Use of services and network information resources

Tutorial

Basic information about the Internet

What is the Internet?

Password recovery