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An ISP has requested a block of 1000 addresses. What is its prefix length?(a) 28(b) 22(c) 26(d) 24The question was posed to me during an online interview.Question is taken from Classless Addressing in portion Internet Protocol, Network Addressing and Transport Level Security of Cryptograph & Network Security

Answer»

Right OPTION is (B) 22

Explanation: n =32- log_2 (1024) = 22.



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