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What is the prefix length for group 3?

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in Cryptograph & Network Security by (60.1k points)
What is the prefix length for group 3?

(a) 28

(b) 26

(c) 24

(d) None of the mentioned

The question was asked at a job interview.

My doubt stems from Designing Subnets in division Internet Protocol, Network Addressing and Transport Level Security of Cryptograph & Network Security

1 Answer

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The correct answer is (b) 26

The best I can explain: 128 customers, each needs 64 addresses

Suffix length = 6 (2^6=64)

Prefix length = 32-6= 26.

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