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GATE CSE 2024 Session 1 Q65: Fragments delivered after two links with MTUs 542 and 360

Question

Consider sending an IP datagram of size 1420 bytes (including 20 bytes of IP header) from a sender to a receiver over a path of two links with a router between them. The first link (sender to router) has an MTU (Maximum Transmission Unit) size of 542 bytes, while the second link (router to receiver) has an MTU size of 360 bytes. The number of fragments that would be delivered at the receiver is ________

Try it: numerical answer: type the value

Numerical answer. No negative marking.
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Answer: 6 (official GATE 2024 final answer key)

Concept used: Fragment payloads (except the last) must be multiples of 8 bytes, and fragments are not reassembled at routers.

First step: On the first link each fragment carries at most 520 data bytes (522 rounded down to a multiple of 8); split the 1400 data bytes accordingly.

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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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