INTERNET

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INTERNET
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WHAT IS INTERNET?

• It is a Network.
• It is a Computer Network
• It is a Network of Networks
• Inter-Network
• Internet-Net/Web/Cyber Space
• Built by the Efforts of everyone
• But nobody Owns Internet

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Access Mechanisms

• Dial up
• Using Telephone line
• ISDN
• Using ISDN line
• Dias
• Using Dias service
• Leased line
• Dedicated line with ISP

• ADSL
• Using Broadband
• Cable Modem
• Using cable tv connection
• Satelite Connection
• Using dish from customer end

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Terms to be familiar

• URL
• Universal resource locator
• HTML
• Hyper text mark up language
• HTTP
• Hyper text transfer protocol
• Domain Name
• www.chennai.bsnl.co.in

• Search engine
• Tool to search information
• Web site
• Place where you have your web pages
• Web pages
• Pages prepared using HTML
• Home page
• First page of a web site

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What is there in Internet?

• Information (WWW)
• Letter Correspondence (E-mail)
• Magazines (E-zines)
• Education (ERNET/Mailing Lists)
• Commerce (E-Commerce)
• Employment (Seek/Select)
• Entertainment (Games/Music/TV)
• Chat (Text/Voice)

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To be more specific..
Client
Server
Client sends request using http protocol
Servers listener process answers and accepts
request
Server locates the files, sends them and closes
the connection.
Browser receives, reads, formats, and
displays the files
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Information (WWW)

• Supports Hypertext
• Documents containing key words connect to other
  document
• The key word is called Hyperlink
• To see the documents, we need a Web Browser Eg
  Internet Explorer
• To search a text, we seek the help of a search
  engine. Eg google.com

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E-mail

• Dominant application of net
• 98 in India
• Facility for attachments
• Similar to Postal mail
• Email ID
• Thru ISP
• Free Email account yahoo.com
• Connectionless service

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FTP

• File Transfer Protocol
• FTP sites have books,articles,software
• Data is mostly files
• FTP components
• Server
• Offers the files
• Client
• Initiates a connection for control and data

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Telnet

• Remote login service
• Allow clients to connect to servers
• Next building
• Other side of the globe