Computer Networks · IPv4 Fragmentation
Official IIT answer key · IIT Delhi · Audited Aug 2026
GATE CSE 2020 Q15 · MCQ · 1 mark
Key concept
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Topic notes
IPv4 Fragmentation in GATE CS is tested through a balanced mix of quantitative fragmentation calculations and conceptual questions regarding packet forwarding semantics. Numerical items focus on calculating the number of fragments and last fragment sizes across single or multi-hop links with varying MTUs, strictly enforcing the 8-byte offset boundary rule. Conceptual items assess router-level operations, identifying where fragmentation happens (source and intermediate routers), where reassembly occurs (destination host only), and transport layer interactions (UDP/TCP header placement and segment-level retransmission).
Full IPv4 Fragmentation guide →Consider the following statements about the functionality of an IP based router. I. A router does not modify the IP packets during forwarding. II. It is not necessary for a router to implement any routing protocol. III. A router should reassemble IP fragments if the MTU of the outgoing link is larger than the size of the incoming IP packet. Which of the above statements is/are TRUE?
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Independent practice explanation verified by the GateAI team. GATE is conducted by the IITs; question text follows the official paper.
