Presentation on Computers
Networks
Definition, Types(LAN,MAN,WAN)
Presented by :- Bikash Bhardwaj
5th Semester (DCOM)
In Computer Network
NETWORKS
Definition
1.

What is a Computer Network?
A Computer Network is a set of autonomous computers connected
together for the purpose of sharing resources. In simple words,
computer network is the interconnection between two or more
computing devices for the purpose of resource sharing.
Classification of Computer networks
Based on Geographical
coverage
Based on Topology
i.
LAN (Local Area Network )
i.
Bus Topology
ii.
MAN (Metropolitan Area
Network)
ii.
Ring Topology
iii.
WAN ( Wide Area Network )
iii.
Star Topology
iv.
PAN ( Personal Area Network )
iv.
Tree Topology
v.
CAN ( Campus Area Network )
v.
Mesh Topology
vi.
Hybrid Topology
vi.
vii.
some others are like SAN , WAN
etc.
Here we will discuss only TOP 3
Based on Ownership
i.
Client – Server
Network
ii.
Peer – to – Peer
Network (P2P)
LAN ( LOCAL AREA NETWORK )
•Local Area Network is a group of computers connected to each other in a small area such as building,
office.
•LAN is used for connecting two or more personal computers through a communication medium such
as twisted pair, coaxial cable, etc.
•It is less costly as it is built with inexpensive hardware such as hubs, network adapters, and ethernet
cables.
•The data is transferred at an extremely faster rate in Local Area Network.
•Local Area Network provides higher security.
MAN ( METROPOLITAN AREA NETWORK)
•A metropolitan area network is a network that covers a larger geographic area by
interconnecting a different LAN to form a larger network.
•Government agencies use MAN to connect to the citizens and private industries.
•In MAN, various LANs are connected to each other through a telephone exchange line.
•The most widely used protocols in MAN are RS-232, Frame Relay, ATM, ISDN, OC-3,
ADSL, etc.
•It has a higher range than Local Area Network(LAN).
WAN ( WIDE AREA NETWORK )
•A Wide Area Network is a network that extends over a large geographical area such as states or
countries.
•A Wide Area Network is quite bigger network than the LAN.
•A Wide Area Network is not limited to a single location, but it spans over a large geographical area
through a telephone line, fibre optic cable or satellite links.
•The internet is one of the biggest WAN in the world.
•A Wide Area Network is widely used in the field of Business, government, and education.
Summarizing with a differentiation of LAN , MAN , WAN :LAN stands for local area network. It is a group of network devices that allow communication between various connected devices. Private ownership
has control over the local area network rather than the public. LAN has a short propagation delay than MAN as well as WAN. It covers smaller areas
such as colleges, schools, hospitals, and so on.
MAN stands for metropolitan area network. It covers a larger area than LAN such as small towns, cities, etc. MAN connects two or more computers
that reside within the same or completely different cities. MAN is expensive and should or might not be owned by one organization.
WAN stands for wide area network. It covers a large area than LAN as well as a MAN such as country/continent etc. WAN is expensive and should
or might not be owned by one organization. PSTN or satellite medium is used for wide area networks.
Basis
LAN
MAN
WAN
Full-Form
LAN stands for local area network.
MAN stands for metropolitan area
network.
WAN stands for wide area network.
Geographic
Span
Operates in small areas such as the
same building or campus.
Operates in large areas such as a city.
Operates in larger areas such as
country or continent.
Ownership
LAN’s ownership is private.
MAN’s ownership can be private or
public.
While WAN also might not be owned
by one organization.
Transmission
Speed
The transmission speed of a LAN is
high.
While the transmission speed of a
MAN is average.
Whereas the transmission speed of a
WAN is low.
Propagation
delay
The propagation delay is short in a
LAN.
There is a moderate propagation delay
in a MAN.
Whereas, there is a long propagation
delay in a WAN.
Congestion
There is less congestion in LAN.
While there is more congestion in
MAN.
Whereas there is more congestion
than MAN in WAN.
LAN’s design and maintenance are
easy.
While MAN’s design and maintenance
are difficult than LAN.
Whereas WAN’s design and
maintenance are also difficult than
LAN as well MAN.
While there is less fault tolerance.
In WAN, there is also less fault
tolerance.
Design &
Maintenance
Fault tolerance There is more fault tolerance in LAN.