Computer Networks · IPv4 Fragmentation
Official IIT answer key · IISc Bangalore · Audited Aug 2026
GATE CSE 2024 Set 1 Q65 · NAT · 2 marks
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 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 …
Topic-wise GATE CS PYQs with verified steps
Independent practice explanation verified by the GateAI team. GATE is conducted by the IITs; question text follows the official paper.
