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GATE CSE 2024 Session 1 Q31: IP header fields changed by NAT on outgoing packets

Question

Which of the following fields is/are modified in the IP header of a packet going out of a network address translation (NAT) device from an internal network to an external network?

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Answer: A, C (official GATE 2024 final answer key)

Concept used: NAT rewrites the private source address to its public address.

First step: Changing any header field forces the header checksum to be recomputed.

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Source: official GATE 2024 Session 1 CS question paper and final answer key, organised by IISc Bangalore. Question paper · Answer key

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