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In classful addressing, a large part of available addresses are ________

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In classful addressing, a large part of available addresses are ________

(a) Organized

(b) Blocked

(c) Wasted

(d) Communicated

The question was asked in an online interview.

My question is taken from IPv4  Addressing topic in portion TCP/IP Protocol Suite of Computer Network

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The correct answer is (c) Wasted

Easiest explanation: In classful addressing, a large part of available addresses are wasted. Thus to solve this classful addressing is replaced with classless addressing where one can reserve the number of IP addresses required by modifying the CIDR value and make sure that not many addresses are wasted.

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