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An ISP has requested a block of 1000 addresses. How many blocks are granted to it?

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An ISP has requested a block of 1000 addresses. How many blocks are granted to it?

(a) 512

(b) 1000

(c) 1024

(d) None of the mentioned

I have been asked this question at a job interview.

My doubt is from Classless Addressing topic in chapter Internet Protocol, Network Addressing and Transport Level Security of Cryptograph & Network Security

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Best answer
Right answer is (c) 1024

The best I can explain: The number of blocks allotted can only be in the powers of 2.

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