Computer learner

......................EXTRANET...................
It stands for External Restricted Access Network. It is a combination of two or more Intranet. An extrnet is somewhat very similar to an intranet(secure business network).Extraneta are designed specifically to give external, limited access to the employees of one or more other companies to certain files/data of your computer system. The firewall helps to control access between the Intranet and Intranet permitting access to the Intranet only to people who are suitably authorized.
Users of intranet consists of: certainly large or privileged customers. selected industry partner. supplier and subcontractors.

..................... E-mail .....................
E-mail stands for Electronic mail,This is the method of sending and recieving messege from one computer to another over the Internet , linked through wired or wireless connection.

Working of E-mail:
E-mail message s consists of two components, the message header, and the message body, which is the e-mail's content. The message header contains control information, including ,an originator's email address and one or more recipient address. Usually additional information is added, such as a subject header field.
This facility is available to the user through some specialized websites called e-mail servers.

For example: yahoo, hotmail, and g-mail e.t.c
It is a facility with which we can send or receive messages anywhere in the world. Every user has an address to recieve email. This address is a unique identity, which is called e-mail address. We obtain an e-mail address simply by joining an ISP(Internet Services Provider).
For example:
[email protected]
Here
Abc : This is the name of the user who creates his e-mail address
Unique: This is the name of e-mail service provider.
Edu: educational institute network called edu.
Pk:pk indicates the name of the country pk means Pakistan.

. . . . . . . . . World Wide Web. . . . . . . . .

The World Wide Web consists of all the public Web sites connected to the Internet worldwide, including the client devices (such as computers and cell phones) that access Web content. It is a collection of millions of uploading web pages/sites stored in different web servers.

A system of Internet servers that support specially formed documents. The documents are formatted in a markup language called HTML(hypertext markup language) that support links to other documents, as well.as graphics, aufio, and video files. This means you can jump from.one document to.another simply by clicking on hot spots.

There are severals applications called Web browsers that make it easy to access the World Wide Web
For example: Firefox, Microsoft Internet Explorer, Chrome
The www is just one of the many applications of the Internet. Through www users connected to internet can access huge collection of websites /web pages.

Www services is based on the following technologies:

1. HTML- Hypertext Mark Language
2. HTTP- Hypertext Transfer Protocol
3. Web servers and Web browsers

. . . . . . .Working of Internet. . . . . . . .

As we know that, Internet is a collection of millions of computer. It may be connected through cables or moderms or phone lines e.t.c. A computer in a business or universities will.usually have a network Network Interface Card (NIC) that directly connects it to a Local Area Network (LAN) inside the business. The business can then connect its LAN to an ISP(Internet Services Provider)using a high speed phone like a T1 lines. A T1 line can handle approximately 1.5 million bits per seconds, while a normal phone line using a modern can typically handle 30,000 to 50,000 bits per second.
ISP then connect to larger ISP, and then largest ISP maintain fibre-optics backbones foran entire region. Backbone around the world are connected through fibre-optics lines, undersea cables or satellite links.
In this way, every computer on Internet is connected to every other computer on the internet.
This is the whole working of internet which is shortly describe.

. . . . . . . . . . . . Network . . . . . . . . . . . .
Network protocols or communication protocol are the rules to exchange data between the network computer or nodes (in networking we called computer as nodes).These set of rules are implemented in the network software.
. . . . . . . . . . . Protocols. . . . . . . . . . .
Protocols basically are the formal set of rules and data structure that directs how computer or nodes and other network devices exchange information over a network.

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