class note

1. Class 2 note
Computer Network
ID:173462589
1. Computer Network Types:
QUS: What are computer networks?
ANS:
 PAN. (Personal Area Network)
 LAN. (Local Area Network)
 MAN. (Metropolitan Area Network)
 WAN. (Wide Area Network)
2. PAN (Personal Area Network):
QUS: What is PAN?
ANS: PAN means Personal Area Network. Personal Area Network covers an area of 10 meters.
PAN includes mobile devices, tablet, and laptop. Thomas Zimmerman was the first research
scientist to bring the idea of the Personal Area Network.
It is a network which consists of less than 5000 interconnected devices across several buildings.
2. LAN (Local Area Network):
QUS: What is LAN?
ANS: LAN means Local Area Network. Local Area Network is a group of computers connected
to each other in a small area such as school, laboratory, home, and office building. It is a network
which consists of less than 5000 interconnected devices across several buildings. Data of all

2. network users can be stored on a single hard disk of the server computer. Local Area Network
provides higher security.
3. MAN (Metropolitan Area Network):
QUS: What is MAN?
ANS: MAN means Metropolitan Area Network. Metropolitan Area Network or MAN is
consisting of a computer network across an entire city, college campus, or a small region. The
most widely used protocols in MAN are RS-232, Frame Relay, ATM, ISDN, OC-3, ADSL, etc.
It offers fast communication using high-speed carriers, like fiber optic cables.
4. WAN (Wide Area Network):
QUS: What is WAN?
ANS: WAN means Wide Area Network. WAN network system could be a connection of a LAN
which connects with other LAN's using telephone lines and radio waves. It is mostly limited to
an enterprise or an organization. A Wide Area Network is widely used in the field of Business,
government, and education. The software files will be shared among all the users; therefore, all
can access to the latest files.