Computer Networks · Principles of Layering
Official IIT answer key · IIT Madras · Audited Aug 2026
GATE CSE 2011 Q2 · MCQ · 1 mark
Key concept
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Topic notes
Principles of Layering in GATE CS evaluates fundamental understanding of the OSI/ISO and TCP/IP reference models, focusing on layer responsibilities, protocol data units (PDUs), and layer traversal mechanics. Questions frequently test header encapsulation, header visibility across intermediate devices (switches, routers, firewalls), and hop-by-hop versus end-to-end addressing. The topic consists predominantly of 1-mark conceptual MCQs/MSQs with occasional 2-mark multi-hop packet transmission delay calculations.
Full Principles of Layering guide →A layer-4 firewall (a device that can look at all protocol headers up to the transport layer) CANNOT (A) block entire HTTP traffic during 9:00PM and 5:00AM (B) block all ICMP traffic (C) stop incoming traffic from a specific IP address but allow outgoing traffic to the same IP address (D) block TCP traffic from a specific user on a multi-user system during 9:00PM and 5:00AM
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.
