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Computer Networks

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Objective
On the completion of this period you would be able
to know
 Meaning of Computer Network
 Kinds of computer Networks

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Introduction to Network
 Initially all computers and other information
processing devices were stand alone only
 Their information was available only to those who
had direct connection to them

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Computer Network
 Interconnection of a group of computer systems and its
related devices

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Fig 136.1 A Simple Network Example

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Fig 136.2 Computer Network of Different resources

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Computer Network needs
 To share resources. (files,printers,modem,fax machines)
 To Share application Software (Ms office)
 Increase productivity-Getting done more work

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Computer networks may be classified
according to the scale
.

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Personal area network (PAN)
• .

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Local Area Network (LAN)
•.

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Campus Area Network (CAN)
• .

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Metropolitan area network (MAN)
.

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Wide area network (WAN)
•.

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Mixed Net work

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Basic Types
There are basically two types of Computer Networks
 Local area networks
 Wide area networks

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Difference
 The main difference between the two is the way in which
they are geographically distributed

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Applications of Computer Network
 Access to Files and Folders on other Computers
 Use other devices that are connected to other
computers. ex: printers
 To contact many on-line services

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Applications of Computer Network contd..
 News Groups
 Network Games
 Voice mail
 Video conferencing
 Fax machine
 Internet relay chat

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Summary
 Introduction to networks
 Definition of Computer network
 Need for a Computer network
 Types of computer networks
 Applications

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Frequently Asked Questions
 What is a computer network?
 Explain the purpose of a computer network
 What are the different types of computer networks?
 What are the applications of computer network?

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QUIZ
1. Interconnection of computer systems is called
a) Operating system
b) Computer Network
c) Distributed system
d) None

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2. Which of the following are computer Network?
a) LAN
b) WAN
c) Both a and b
d) None
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