How many usable host addresses are in a network with prefix /27?

Answer and explanation

Correct answer: B. 30

  1. Step 1: There are 32 - 27 = 5 host bits, giving 32 addresses.
  2. Step 2: Subtract the network and broadcast addresses: 30.
Answer
30.
Why not the others: 32, 31 and 8 do not fit.

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