You have a Class B network and need 29 subnets. What is your mask?
A) /30
B) /25
C) /24
D) /21
D
Explanation: 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.
Computer Science & Information Technology
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