this topology all the computers are attached to a single continuous cable. The
cable is typically a co-axial one, and terminated at both the ends. The cable
termination at the ends ensures that the signals are not reflected after
reaching the end of the cable. The computers are attached to the cable
taps. Using Bus Topology, the information signals are available at every
individual workstation. However, the individual work stations discard
information that is not meant for them.
Bus topology network is
simple to install, inexpensive, and easy to maintain. However, there are
several disadvantages of using this topology:
1. Any cut in the cable will result
in severe communication disruption, and need to be fixed on priority.
2. It is difficult to affect server,
and workstation moves.
In a star topology each computer is connected to a centrally placed Hub or a
Switch by a separate
cable. A typical star topology network is shown below.
Topology is the most widely used network topology, and has the following
of new work stations or other network devices is easy. You only need a spare
port on the central hub, and a drop-down cable to attach a work station.
Even if a work
station cable is unplugged, or damaged, the network will still be operative.
of this type of network is more organized, and relatively easy.
In the ring
topology each computer is connected directly to two other computers (one in the
up-stream, and another in the down-stream) in the
network. A typical network using Ring Topology is shown in the figure below:
The main advantages of Ring Topology
include high bandwidth capacity, fault location identification, and ability to
cover relatively larger distances. The main disadvantage is that a single cable fault may bring down the
In Mesh topology, a path exists from each node to one or more nodes in the
network. In a Full Mesh, every node will have a connection to every other node
in the network. A typical diagram shown full mesh connections among five
nodes (or hosts) is shown in the figure below:
The main advantage is redundancy. If
one connection fails, a node can communicate over another network connection.
The chief disadvantages are cost and complexity of the topology.
Among the topologies discussed,
Star Topology is the most widely used. Ring Topology is used when you need to
connect several smaller networks (say, using Star Topology) using high bandwidth