Lacture 11

1. Introduction to
Computer Applications
Lecture # 11

2. Objective of Lecture
 Networks
 Uses of Networks
 Types of Networks
 LAN
 WAN
 MAN
 PAN

3. NETWORKS
 Networks is a set of technologies – including hardware,
software and media – that can be used to connect
computers together, enabling them to communicate,
exchange information and share resources in real time
 A computer network is a group of interconnected
computers.
 It allows computers to communicate with each other and
to share resources and information.

4. Contd..
 First Network : The Advanced Research Projects Agency
(ARPA) funded the design of the "Advanced Research
Projects Agency Network" (ARPANET) for the United
States Department of Defense

5. Why do you want to have
Networks?

6. Uses of Networks
 Sharing Resources
 1 printer , many people wanting to print
 Access to same data and programs
 Servers
 Personal Communication
 Email
 Audio/Video/Data Conferencing

7. Uses of Networks
 Access to remote resources
 File downloads
 Data Backups
 Shared storage device
 Regular data backup
 Greater performance
 Distributed computing

8. Types of Computer Networks
 LAN: Local Area Network
 WAN: Wide Area Network
 MAN: Metropolitan Area Networks
 PAN: Personal Area Networks
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9. LAN
 A network of computers located in the same building
or a handful of nearby buildings
 Contains printers, servers and computers
 Systems are close to each other
 Contained in one office or building
 Organizations often have several LANS
 Examples:
 Computer network at UoG
 Computer network of a University campus
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10. LAN
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11. WAN
 A network in which computers are separated by great
distances, typically across cities or even continents
 May consist of several interconnected LANs
 Over a large geographic area
 Example:
 The network connecting the ATM of a bank located in
various cities
 A network connecting the local and oversea offices of a
Software house
 The Internet is a WAN
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12. WAN
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13. MAN
 A MAN is optimized for a larger geographical area than
a LAN, ranging from several blocks of buildings to entire
cities
 Large network that connects different organizations
 Shares regional resources

14. MAN

15. PAN
 A personal area network (PAN) is a computer
network used for data transmission among devices such
as computers, telephones and personal digital assistants
 Very small scale network
 Range is less than 2 meters
 Cell phones, PDAs

16. PAN

17. (Geographical Scope)
Classification
• Wide Area Networks
• Metropolitan Area Networks
• Local Area Networks
• Personal Area Networks

18. Questions??