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GATE CSE 2025 Session 2 Q16: ARP mapping and TCP piggybacked acknowledgements

Question

Consider the following statements:

(i) Address Resolution Protocol (ARP) provides a mapping from an IP address to the corresponding hardware (link-layer) address.

(ii) A single TCP segment from a sender S to a receiver R cannot carry both data from S to R and acknowledgement for a segment from R to S.

Which ONE of the following is CORRECT?

Try it: multiple choice: exactly one correct option

Select one option
Wrong answer costs 1/3 mark in GATE.
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Answer: B (official GATE 2025 final answer key)

Concept used: ARP resolves IP to MAC addresses; TCP piggybacks acknowledgements on data segments.

First step: Recall that every TCP segment has an ACK field that is valid alongside its data payload.

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Source: official GATE 2025 Session 2 CS question paper and final answer key, organised by IIT Roorkee. Question paper · Answer key

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