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Showing posts with label cable. Show all posts
Showing posts with label cable. Show all posts

Star Topology

2:07 PM kdhakal 0 comments
A star topology consists of a central connection hub to which devices are connected with UTP (Unshielded Twisted Pair) Ethernet. Contrary to the bus topology, a star topology utilizes a point-to-point connection to connect each node to the central hub. The hub acts as a signal booster as well, and all the data traffic that transverses the network passes through this hub.
The entire network is dependent upon the central hub in a star topology, so if the entire network is not working, it means that there is problem in the hub. This makes it easy to troubleshoot the network because of the only one point for error correction. As all the computers in star topology are independent to each other and dependent only on the central hub, network failure or other network problems are less likely to happen. The privacy of each of the computers is also maintained in this topology.
In star topology, new devices and nodes can be easily added and by just extending a cable from the hub.


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Advantages of star topology:
  • A star topology is simple in functionality and easy to manage.
  • If a problem occurs in the network, it can be easily isolated and cleared.
  • It is very easy to expand the star topology because of its simple format.

Disadvantages of star topology:
  • The entire network of the star topology is completely dependent on the hub. If the hub fails, the whole network fails.
  • Network connection may slow down when the number of nodes increases or the cable lengthens.
  • Star topology needs more cable length than other topologies.
  • It is more expensive compared to bus topology.






star topology
Star Topology








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Types of network topologies

1:25 PM kdhakal 4 comments
Bus topology

A bus topology uses a single cable to connect all the devices used in the network. The single cable forms the backbone of the communication medium in which the devices are attached. To establish a communication, a signal originating from the source travels in both directions to all the machines connected on the bus cable until it finds the address of the device to which the data is to be delivered. If the destination device finds that the data is for its own address, then only it accepts the data. The topology consists of terminators at both ends so that the data does not continue bouncing to and fro.

Advantages of bus topology:

  • If one of the station fails to operate, it does not affect the operation of other stations.
  • It can be a good replacement against other topologies.
  • It is very suitable for such networks which are more or less temporary and which are needed immediately.
  • It is easy to implement and extend.


Disadvantages of bus topology: 

  • Data collision may occur when two or more nodes are transmitting the data at the same time.
  • It is not suitable if the traffic rates in the network is heavy.
  • It is very difficult to manage and troubleshoot a bus topology.
  • A fault in the cable may disable the whole network and it would be very difficult to find that fault.
  • Maintenance cost can increase unexpectedly at the long run.
  • Performance of the network is degraded when more computers are added to the network.



Bus topology
Bus topology
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