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In the above question, what is the subnetwork mask for each network?

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In the above question, what is the subnetwork mask for each network?

(a) 27

(b) 29

(c) 28

(d) 26

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Asked question is from Designing Subnets topic in division Internet Protocol, Network Addressing and Transport Level Security of Cryptograph & Network Security

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Right option is (c) 28

Explanation: nsub1 = nsub2 = nsub3 = nsub4 = n + log2(N/Nsub) =26+ log2(64/16)= 28.

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