Here 7 routers are given which are connected with a mesh topology, you have to find how many links they are connected through?
and if you add one more router in the current mesh, how many links now you have to add?
use this formula:
no. of links= n(n-1)/2
where n = number of nodes
let us solve one as an example:
suppose we have 5 routers in a mesh and we have to find the number of links:
no. links= n(n-1)/2
= 5(5-1)/2 = 10 links