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Consider three machines M, N, and P with IP addresses 100.10.5.2, 100.10.5.5, and 100.10.5.6 respectively. The subnet mask is set to 255.255.255.252 for all the three machines. Which one of the following is true?

1. M, N, and P all belong to the same subnet
2. Only M and N belong to the same subnet
3. Only N and P belong to the same subnet
4. M, N, and P belong to three different subnets

Correct answer: Only N and P belong to the same subnet

Solution

With mask 255.255.255.252 (/30) the network is the address with its last two bits cleared. .2 gives network .0, while .5 and .6 both give network .4. So M is alone in subnet .0 and N and P share subnet .4: only N and P belong to the same subnet (index 2).

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