Designed By:Saddam Hussain Soomro

1. Internet

2. The Internet’s History
• 1969 – ARPANET(Advanced Research Projects Agency Network)
– Developed by the Department of Defense
– Connected universities and defense bases
• 1973 – ARPANET connects to Europe
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3. Internet
• It is a network, which connects millions of
users with millions of hosts.
• It is also called network of networks.
• It is a source of information and provides
many services and facilitates in different
working areas.
• It has billions of web sites and web pages
having knowledge about different topics.

4. INTERNET

5. The Internet’s Major Services
• The World Wide Web (WWW)
– Developed in 1993 by Tim-Berners Lee
– Allowed connection of documents
– Required a browser to read documents
• Electronic mail (e-mail)
– immediate transmission of documents
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6. The Internet’s Major Services
• News
– Often called newsgroups
– Electronic discussions on several topics
• File Transfer Protocol (FTP)
– Sends and receives files
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7. The Internet’s Major Services
• Chat
– Public real time conversation
• Instant messaging
– Private real time conversation
• Peer-to-peer services
– Allows sharing of files among users
– Napster and Kazaa are examples
– Illegal to share copyrighted material

8. Accessing The Internet
• Internet Service Provider (ISP)
– Company that provides Internet access
• Dialup
– Connects to Internet through phone line
– Modem connects to the phone line
– Slow connection

9. Accessing The Internet
• High-speed access
– Connect through a special line
– 2 – 25 times faster than dialup
– DSL, Cable, T1 are common

10. Understanding the Internet
• The Internet allows accessing resources
• The Web simplifies the Internet
• The Web connects documents
– Hypertext creates links between documents
– Documents are stored on a web server
– HTTP delivers documents

11. Understanding the Internet
• Web site is a collection of documents
– Document is a web page
– Pages are published to the web
• Hypertext Markup Language
– Creates web pages
– Describes how pages should look
– Content enclosed in tags
– <tag>content</tag>

12. Understanding The Internet
• Browsers
– Read and translate the HTML
– Display web content
• Uniform Resource Locator (URL)
– Address of a web page
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13. Intranet
• It is a small internet inside a company or
organization (a private Internet).
• It uses same technology as of internet
standards and operates in the same way.
• If intranet is connected to internet or external
network to provide or share information then
firewall software is used to protect intranet
resources from outside access.

14. Extranet
• It is a network connection that enables external
users to access a portion or some parts of an
organization internal network, usually via internet
connection.
• They can access specific parts of internal network
but are restricted to access other areas, which are
protected by firewalls.
• Some organizations have web sites available on the
Internet, but with access limited to account holders
by password, such facility is also called extranet.

15. Cyber Crime
• crime committed using a computer and the
internet to steal a person's identity or sell
illegal imports or follow victims or disturb
operations with malevolent programs
• E.g. Fraud, Hacking, viruses