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Question 40

With an IP address of 100, you currently have 80 subnets. What subnet mask should you use to maximize the number of available hosts ?

  1. A192
  2. B224
  3. C248
  4. D252
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Correct answer: (D) 252

Explanation

Note: the answer key gives (D) 252, but 252 adds only 6 subnet bits (64 subnets). 80 subnets need 7 bits (2⁷ = 128), which makes the octet 254 (255.254.0.0 for network 100). The question is garbled.

From DSSSB TGT Computer Science Practice Set 4

This is question 40 of DSSSB TGT Computer Science Practice Set 4. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.