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What is the prefix length for group 2?

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in Cryptograph & Network Security by (60.1k points)
What is the prefix length for group 2?

(a) 14

(b) 7

(c) 25

(d) None of the mentioned

I had been asked this question in unit test.

The doubt is from Designing Subnets topic in section Internet Protocol, Network Addressing and Transport Level Security of Cryptograph & Network Security

1 Answer

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The correct choice is (c) 25

The explanation: 128 customers, each needs 128 addresses

Suffix length = 7 (2^7=128)

Prefix length = 32-7= 25.

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