ISRO Computer Science (CSE) 2013 - Question 43

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What is IP class and number of sub-networks if the subnet mask is 255.224.0.0?

  • A. Class A, 3
  • B. Class A, 8
  • C. Class B, 3
  • D. Class B, 32

Answer: B. Class A, 8

Explanation: 255.X.X.X implies Class A default. Mask 255.224.0.0 (/11). Borrowed bits = 11 - 8 = 3. Subnets = $2^3 = 8$.

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