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Question 162

The subnet mask for a /21 network is:

  1. A255.255.248.0
  2. B255.255.255.248
  3. C255.255.240.0
  4. D255.255.252.0
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Correct answer: (A) 255.255.248.0

Explanation

21 bits: 8 + 8 + 5 → third octet 11111000 = 248.

From DSSSB TGT Computer Science Full Mock Test 4

This is question 162 of DSSSB TGT Computer Science Full Mock Test 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.