a

3.  Network is an interconnection of many
communicating devices that are connected for
the purpose of data communication.
There are many types of network.
 Local Area Network (LAN).
 Metropolitan Area Network (MAN).
 Wide Area Network (WAN).

4.  The term topology in context of communication network
refers to the way in which the end points or stations of a
network are linked together.
 Network topology is a sets of rules for physical
connecting and communicating on a given network
media.
 Topology is broken down into two categories
a. Physical: actual layout of the computer cables and other network
devices
b. Logical: the way in which the network appears to the devices that
use it.

8.  In bus topology all devices are connected to
a central cable called bus or back bone.
 When one computer sends a signals through
the wire, all the computers on the network
receive the information, but one accept the
information.

10.  The bus is simple & easy to implement.
 Reliable in very small network.
 Easy to understand.
 Requires least amount of cables to connect
the computer.
 Easy to extend the bus.
 Does not required any specialize network
equipment.

11.  It only supports small number of computer.
 If a number of computer increases network
speed will slow down.
 A break in a cable will prevent all systems
from accessing the network.
 It is difficult to troubleshoot.

14.  Every computer has equal access to the
network.
 It is less expensive then star topology.
 Cable faults are easily located, making
troubleshooting is easier.

15.  Addition of new nodes in the network
increases the communication delays.
 Adding & removing computers affects the
whole network.
 The failure of one computer in the ring can
affect the whole network.

17. hub

18.  Easily expended without disruption to the
network
 Cable failure affects only a single user.
 Easy to troubleshoot and isolate problems.

19.  Difficult to implement.
 If the host computer fails the entire network
fails.
 Systems are dependent on central node.

20.  Mesh topology has a separate physical link
for connecting each node to any other node.
 Each computer of such network has direct
dedicated link, called a point to point link with
all other computer of the network.
There are two types of mesh topology:
1. Full Mesh.
2. Partial Mesh.

22.  It is easy to troubleshoot.
 Communication is fast between any two
nodes.
 it eliminates the traffic problems.
 Failure of one link does not affect entire
network.

23.  It is very expensive.
 It is difficult to install & reconfigure.
 Requires more cables then other
LAN topologies.