How many usable host addresses are in a network with prefix /30?

Answer and explanation

Correct answer: B. 2

  1. Step 1: There are 32 - 30 = 2 host bits, giving 4 addresses.
  2. Step 2: Subtract the network and broadcast addresses: 2.
Answer
2.
Why not the others: 4, 3 and 64 do not fit.

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