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In IPv4 Addresses, classful addressing is replaced with ________

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In IPv4 Addresses, classful addressing is replaced with ________

(a) Classless Addressing

(b) Classful Addressing

(c) Classful Advertising

(d) Classless Advertising

I got this question in an internship interview.

This intriguing question comes from IPv4  Addressing topic in section TCP/IP Protocol Suite of Computer Network

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Correct choice is (a) Classless Addressing

Easiest explanation: Classful addressing is replaced with classless addressing as a large ratio of the available addresses in a class in calssful addressing is wasted. In classless addressing, 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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