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Computer Networks · IPv4, CIDR and NAT
Official IIT answer key · IIT Roorkee · Audited Aug 2026
GATE CSE 2017 Set 2 Q20 · NAT · 1 mark
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Topic notes
IPv4 testing in GATE CS focuses heavily on numerical datagram mechanics (fragmentation offset, payload size, header scaling factors), CIDR subnetting (subnet allocation, host ranges, bitwise masking, and longest prefix match forwarding), and IP header architecture (field modifications during transit, option field capacity, and encapsulated protocol numbers). Questions are evenly split between 1-mark conceptual/header checks and 2-mark multi-step arithmetic or routing table lookups.
Full IPv4, CIDR and NAT guide →The maximum number of IPv4 router addresses that can be listed in the record route (RR) option field of an IPv4 header 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.