1. The document classifies and describes different types of computer networks: personal area networks (PAN), local area networks (LAN), metropolitan area networks (MAN), and wide area networks (WAN). 2. PAN covers an area of 10 meters and includes mobile devices connected to each other. LAN connects computers within a small area like a school or office building and stores user data on a local server. 3. MAN spans an entire city or small region and uses protocols like Frame Relay and ATM to provide fast communication over fiber optic cables. WAN connects LANs over long distances using telephone lines and radio waves to share files among users in organizations.

1. Computer Networks
CLASS NOTE-2
Lecturer
Pranab Bandhu Nath
Senior Lecturer
CSE Department
City University, Dhaka
STUDENT
NAME :MD HASNAIN
ID :1834902583
Department of CSE City University, Dhaka.

2. Classification of Computer Networks
Computer Network Types:
PAN(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.
LAN(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 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):
• 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.
WAN(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.