INTERNET AND PROTOCOLS INTERNET AND PROTOCOLS

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INTERNET It is a network of networks (LAN/ MAN/

WAN) Consists of millions of private and

public, academic, business, and government networks of local to global scope

Linked by copper wires, fiber-optic cables, wireless connections, and other technologies.

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NETWORK A set of nodes, points, or locations

connected by means of data, voice, and video communications for the purpose of exchange.

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ADVANTAGES Information Storehouse. Resource Sharing. Global Access. Cost Effective. 24 Hours a day-7 days a week. Entertainment.

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DISADVANTAGES Theft Of Personal Information. Internet Misuse. Virus Threat. Spamming And Unsolicited Emails. Internet Addiction.

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TERMINOLOGIES USED IN INTERNET Web Server. Web Browser. Protocols.

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WEB BROWSERA web browser is the program being used to

access the World Wide Web. It is used for retrieving, presenting and traversing information on World Wide Web.

Example: Internet Explorer

Mozilla Firefox Google Chrome Netscape Navigator

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WEB SERVER

A computer program that serves the requested files and sends web pages to the client's browser. It can be hardware or the software that helps to deliver web content that can be accessed through the Internet.

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PROTOCOLSIt is a set of rules that govern the

communication between the devices. Both sender and receiver follow same protocols to communicate with each other on the network.

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PROTOCOLS TCP (Transmission Control Protocol) IP (Internet Protocol) UDP (User Datagram Protocol) HTTP (Hypertext Transfer Protocol) FTP (File Transfer Protocol) SMTP (Simple Mail Transfer Protocol) POP (Post Office Protocol)

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INTERNET PROTOCOL It is network layer protocol. Provides the method of distributing

data in packets. Distribute packets to a destination via

different routes. Handle congestion.

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IP ServicesIP supports the following services:

one-to-one (Unicast) one-to-all (Broadcast) one-to-several (Multicast)

unicast broadcast multicast

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TRANSMISSION CONTROL PROTOCOL It is transport layer protocol. Provides reliable end-to-end

communications. Deliver the byte stream from source

to destination without any error. Divide the byte stream into small

parts. Perform flow control.

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USER DATAGRAM PROTOCOL It is transport layer protocol. Used for those applications that

require prompt delivery. Does not offer flow control and error

control. Provide Unreliable connectionless

services.

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HYPERTEXT TRANSFER PROTOCOL It is an application layer protocol. Used for fetching web pages on World

Wide Web. HTTP transaction between the client

and server consist of request and response.

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FILE TRANSFER PROTOCOL It is an application layer protocol. Used for transfer of file from one

system to another. Uses client/server model for

communication. Does not actually transfer a file rather

copies it.

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SIMPLE MAIL TRANSFER PROTOCOL It is simple ASCII protocol. Based on client/server model. Used for the transfer of mail message

and attachments.

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POST OFFICE PROTOCOL Message access protocol. Enables the client to fetch an e-mail

from the remote mail server. Virtually all modern e-mail clients

and servers support both. Most webmail service providers such

as Google Mail, Microsoft Mail and Yahoo Mail provide both an IMAP and POP3 service.

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THANK YOU

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