Computer Networks · IPv4, CIDR and NAT
Official IIT answer key · IIT Kharagpur · Audited Aug 2026
GATE CSE 2014 Set 3 Q25 · MCQ · 1 mark
Key concept
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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 →Host A (on TCP/IP v4 network A) sends an IP datagram D to host B (also on TCP/IP v4 network B). Assume that no error occurred during the transmission of D. When D reaches B, which of the following IP header field(s) may be different from that of the original datagram D? (i) TTL (ii) Checksum (iii) Fragment Offset
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.
