2. What is Network ?
• In case of computer , when one computer wants to
communicate with other computer. It is required one
secured connection between them.so the above
scenario is called Network between computers.
• The secured connection means communicate the
authenticated by computers in network.
• So,In one way ,we can say networks is group of
connection between computers.
3. Types of Networks :-
• There are three types of networks :
1. LAN
2. MAN
3. WAN
4. LAN [ Local area network] :
• It is a very basic network with small connection between computers.
• LAN is an important concept of WAN.
• The LAN enable a station to communicate directly using physical cable
or physical medium for point-to-point connection without any
intermediate media.
• LAN is working with connection oriented communication means
physical connection is required for LAN.
• LAN is system composed to the computers with hardware &
transmission media.
• Is fast , with speeds from 10 Mbps to 10 Gbps.
5. • There are Three characteristic of LAN :
1. Topology
2. Protocols
3. Media
• Topology :It is geometric arrangement of devices in
networks.
for ex : if more than two computers are arranged with
single transmission medium.so it is called as
BUS Topology.
• There are different Topology in a LAN are linked
together :
1.BUS Topology
2.STAR Topology
3.RING Topology
4.MESH Topology
5.HYBRID Topology
6. PROTOCOLS :
• The rules of encoding specification for sending any information in network.
• Every LAN uses a protocol – a set of rules that governs how packets are
configured and transmitted.
MEDIA :
• In network devices are connected with each other by different media like
twisted pair cables , co-axial cables & fiber optic cables.
• Some network do without connecting with each other is called radio wave
media or wireless media.
7.
8. MAN [Metropolienton area network] :
• MAN usually falls between LAN & WAN. It is generally apply to connect
geo-graphically spread lance.
• There for the goal of MAN is to develop communication link between
to Independence LANs.
• MAN is establish by using optical fiber. The network is established using
ROUTER & SWITCH is a part which is actively handling filtration of data.
Any switch is working has one node and router acts like point-to-point
node.
• Router helps the data packet to identify the path from source to
destination. MAN is usually operated over area up to 50km.
• The use of MAN network is Digital cable television ,Used in government
agencies &University campuses.
9. ADVANTAGES :
• Less expensive
• Sending local emails
• High speed than WAN
• Sharing of the internet
• Conversion from LAN to MAN is easy
• High Security
DISADVANTAGES :
• Difficult to manage
• Internet speed difference
• Hackers attack
• Technical people required to set up
• More wires required:
10. WAN [ Wide area network] :
• It is a network that exist over a large scale geo-graphical area network.
• WAN includes smaller networks like MAN & LAN.
• When WAN is established one location which contains MAN is
communicating MAN is communicating with other location.
• The Internet of WAN is provided by ISP or IPS.
• The world’s most popular WAN is the Internet.
• Multiple LANs can be connected together using devices such as bridges ,
routers or gateways which enable them to share data.
11. ADVANTAGES :
• Centralizes IT infrastructure
• Boosts your privacy
• Increases bandwidth
• Eliminates Need for ISDN
• Guaranteed uptime
• Cuts costs, increase profits
DISADVANTAGES :
• High setup costs
• Security Concerns
• Maintenance Issues
12. BASIS OF
COMPARISON
LAN MAN WAN
Expands to Local Area Network Metropolitan Area Network Wide Area Network
Meaning A network that connects a
group of computers in a
small geographical area.
It covers relatively large
region such as cities, towns.
It spans large locality and
connects countries
together. Example Internet.
Ownership of
Network
Private Private or Public Private or Public
Design and
maintenance
Easy Difficult Difficult
Propagation Delay Short Moderate Long
Speed High Moderate Low
Fault Tolerance More Tolerant Less Tolerant Less Tolerant
Congestion Less More More
Used for College, School, Hospital. Small towns, City. Country/Continent.
