Question

For n devices in a network, what is the number of cable links required for a mesh, ring, bus, and star topology?

Answer 1

Answer:

Figure 1 : Every device is connected with another via dedicated channels. These channels are known as links.

If suppose, N number of devices are connected with each other in mesh topology, then total number of ports that is required by each device is N-1. In the Figure 1, there are 5 devices connected to each other, hence total number of ports required is 4.

If suppose, N number of devices are connected with each other in mesh topology, then total number of dedicated links required to connect them is NC2 i.e. N(N-1)/2. In the Figure 1, there are 5 devices connected to each other, hence total number of links required is 5*4/2 = 10.

Figure 2 : A star topology having four systems connected to single point of connection i.e. hub.

If N devices are connected to each other in star topology, then the number of cables required to connect them is N. So, it is easy to set up.

Each device require only 1 port i.e. to connect to the hub.

Figure 3 : A bus topology with shared backbone cable. The nodes are connected to the channel via drop lines.

If N devices are connected to each other in bus topology, then the number of cables required to connect them is 1 which is known as backbone cable and N drop lines are required.

Cost of the cable is less as compared to other topology, but it is used to built small networks.

Figure 4 : A ring topology comprises of 4 stations connected with each forming a ring..

One station is known as monitor station which takes all the responsibility to perform the operations.

To transmit the data, station has to hold the token. After the transmission is done, the token is to be released for other stations to use.

When no station is transmitting the data, then the token will circulate in the ring.

There are two types of token release techniques : Early token release releases the token just after the transmitting the data and Delay token release releases the token after the acknowledgement is received from the receiver.

Figure 5 : A hybrid topology which is a combination of ring and star topology.

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