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If there are $n$ devices (nodes) in a network, what is the number of cable links required for a fully connected mesh and a star topology respectively

1. $n(n-1)/2$, $n-1$
2. $n$, $n-1$
3. $n-1$, $n$
4. $n-1$,  $n(n -1)/ 2$

### 1 comment

Option A is correct.

A) n(n-1)/2 and n-1

In a full mesh topology, every computer in the network has a connection to each of the other computers in that network. The number of connections in this network can be calculated using the following formula (n is the number of computers in the network): n(n-1)/2

https://www.computerhope.com/jargon/m/mesh.htm

@Manoja

How you get n(n-1)/2 cables for mesh topology?

expln plz
Mesh : Edges can be taken in nC2 = n(n-1)/2 cables

Star :  1 node is connected to remaining nodes and the are (n-1) remaining nodes which required : (n-1) cables
by

A) n(n-1)/2 and n-1

(n (n-1))/2, n

### 1 comment

n-1 b'cz central controller is also consider as device.

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