Taking the following example shown in the first image, why has my teacher has assigned in the solution (image 2) for network one (N1): 7+2 hosts?
Shouldn't it be 6+2 since the number of hosts in that network is 6 and the first and the last (broadcast) can't be assigned?
He has done the same things until N6 and N7 where he assigned 2+2 for the link.
Is this correct and there should be something that I need to know?