You have a Class B network and need 29 subnets. What is your mask?
A) /30
B) /25
C) /24
D) /21

Name: You have a Class B network and need 29 subnets. What is your mask? A) /30 B) /25 C) /24 D) /21
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Quizplus · Accepted Answer

D) To get at least 29 subnets, you must have at least 5 subnet bits (2⁵ = 32). When you use a Class B network, the subnet bits would start at the 17th bit and go to the 21st bit (16 + 5 bits = 21) for a mask of /21, or 255.255.248.0.

You Have a Class B Network and Need 29 Subnets