Definition of Network Topology:
The layout of the computer and devices in a communications network.
Types of Network Toplogy:
Bus Topology
*A bus network consists of a single central cable
to which all computers and other devices connect (node). Each devices is
connected through T-Connector. A terminator is required at each of the bus
cable to prevent the signal from bouncing back and forth on the bus cable.
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Advantages |
Disadvantages |
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1) Easy to use and to understand. 2) Requires least amount of cable
to connect the computers together. It is therefore less expensive than other
cabling arrangements. 3) It is easy to extend a bus; two
cables can be joined into 1 longer cable with a BNC, Barrel connector making
a longer cable and allowing more computers to join the network. |
1) Heavy network traffic can slow a
bus considerably as only 1 computer can send a message at a time. 2) It is difficult to troubleshoot
the bus. A cable break or loose connector causes reflection and stops all the
activity. |
Star Topology
*All the computers and devices on the network connect to a central device (hub/switch).
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Advantages |
Disadvantages |
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1) It is easy to modify and add new
computers without disturbing the rest of the network. 2) The center of the star network
is a good place to diagnose the faults. 3) Single computer failure does not
necessarily bring down the whole star network. |
1) If the central device fails the
whole network fails to operate. 2) Star networking is expensive
because all network cables must be pulled to one central point, requires more
cable than other network topologies. |
*a cable forms a closed loop cable with all computers and devices arranged along the ring.
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Advantages |
Disadvantages |
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1) Each node has equal access. 2) Capable of high speed data
transfer. |
1) Failure of one computer on the
ring can affect the whole network. 2) Difficult to troubleshoot the
network. |
