GATE CSE 2024 Session 2 Q38: CIDR prefix covering 10.12.2.0 to 10.12.3.255

Which one of the following CIDR prefixes exactly represents the range of IP addresses 10.12.2.0 to 10.12.3.255?

Try it: multiple choice: exactly one correct option

Wrong answer costs 2/3 mark in GATE.

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Answer: A (official GATE 2024 final answer key)

Concept used: A block of $2^k$ aligned addresses has prefix length $32 - k$ .

First step: The range holds 512 = $2^9$ addresses, and 10.12.2.0 is a multiple of 512 in the address space.

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Source: official GATE 2024 Session 2 CS question paper and final answer key, organised by IISc Bangalore. Question paper · Answer key