NCERT Computer: Chapter 6 – Fundamentals of Internet and Java Programming Part 2

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Services of Internet - E-mail, FTP, Telnet, WWW

One can also send software and certain forms of compressed digital image as an attachment. News groups or discussion groups facilitate Internet user to join for various kinds of debate, discussion and new sharing.

Long-distance computing was an original inspiration for development of ARPANET and does still provide a very useful service on Internet.

Programmers can maintain accounts on distant, powerful computers which execute programs.

File transfers service allows Internet users to access remote machines and retrieve programs, data or text.

(I) Features of E-Mail

  • One-to-one or one-to-many communication

  • Instant communication

  • Physical presence of recipient is not required

  • Most inexpensive mail service, 24-hours a day and seven days a week

  • Encourages informal communication

Components of an E-mail Address

As in the case of normal mail system, e-mail is also based upon the concept of a recipient address.

The e-mail address provides all the information required to get a message to the recipient from anywhere in the world.

Hotmail is the mail server where the mailbox "john" exists; .com is the type of organization on net, which is hosting the mail server.

There are six main categories;

This image shows the categories of email address

Image Shows the Categories of Email Address

This image shows the categories of email address

(Ii) FTP

File Transfer Protocol, is an Internet utility software used to upload and download files.

FTP works on the basis of the same principle as that of Client/Server. FTP client is a program running on your computer that enables you to talk to and get stuff from remote computers.

The FTP client takes FTP commands and sends them as requests for information from the remote computer, known as FTP servers.

This image shows File Transfer Protocol

Image of File Transfer Protocol

This image shows File Transfer Protocol

When the FTP client gets connected, FTP server asks for the identification in terms of User Login name and password of the FTP client.

Using anonymous login anyone can login to a FTP server and can access public file archives, anywhere in the world, without having an account. One can easily Login to the FTP site with the username anonymous and e-mail address as password.

The basic objectives of FTP are

  • To give flexibility and promote sharing of computer programs, files and data.

  • To transfer data reliably and more efficiently over network.

  • To encourage implicit or indirect use of remote computers using Internet.

  • To shield a user from variations in file storage systems among hosts

Imag of FTP client and Server

Imag of FTP Client and Server

Imag of FTP client and Server

The basic steps in an FTP session are:

  • Start up your FTP client; by typing ftp on your system’s command line c;\>’ prompt (or, if you are in a Windows, double-click on the FTP icon).

  • Give the FTP client an address to connect to. This is the FTP server address to which the FTP client will get connected.

  • Identify yourself to the FTP remote site by giving the Login Name

  • Give the remote site a password

  • Remote site will verify the Login Name/Password to allow the FTP client to access its files.

  • Look directory for files in FTP server

  • Change Directories if required

  • Set the transfer mode (optional);

  • Get the file(s) you want; and

  • Quit