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The subnet mask nsub1=

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The subnet mask nsub1=

(a) 23

(b) 25

(c) 26

(d) 27

I had been asked this question in class test.

This key question is from Designing Subnets topic in section Internet Protocol, Network Addressing and Transport Level Security of Cryptograph & Network Security

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Best answer
Correct answer is (b) 25

The best explanation: nsub1= n+log2(N/Nsub1) = 25.

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