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Computer Networks · Data Link Layer
Official IIT answer key · IIT Bombay · Audited Aug 2026
GATE CSE 2021 Set 1 Q29 · MCQ · 2 marks
Assume that a 12-bit Hamming codeword consisting of 8-bit data and 4 check bits is , where the data bits and the check bits are given in the following tables:
Key concept
Topic notes
Medium Access Control (MAC) in GATE CS is predominantly tested through quantitative numerical problems and conceptual protocol comparisons. The focus is split between random access protocols (CSMA/CD collision detection constraints and slotted ALOHA transmission probabilities), controlled access (Token Ring round-trip delays and token holding limits), and wireless MAC protocols (IEEE 802.11 CSMA/CA features, channels, and ACK mechanisms). Most questions carry 2 marks and appear in NAT format requiring unit conversions.
Full Data Link Layer guide →Independent practice explanation verified by the GateAI team. GATE is conducted by the IITs; question text follows the official paper.