Computer Networks · DNS and HTTP
Official IIT answer key · IIT Delhi · Audited Aug 2026
GATE CSE 2020 Q25 · NAT · 1 mark
Key concept
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Topic notes
In GATE CS, the 'DNS and HTTP' topic is tested predominantly through conceptual protocol interaction, chronological packet sequencing, connection lifecycle mechanics, and timing calculations. Early exams focused on basic protocol roles (SMTP, POP3, HTTP), statefulness, and HTML/XML properties, whereas recent exams (2020–2026) strongly emphasize quantitative analysis of iterative DNS hierarchies, persistent vs. non-persistent HTTP, pipelining, and total round-trip time (RTT) latency.
Full DNS and HTTP guide →Assume that you have made a request for a web page through your web browser to a web server. Initially the browser cache is empty. Further, the browser is configured to send HTTP requests in non-persistent mode. The web page contains text and five very small images. The minimum number of TCP connections required to display the web page completely in your browser is …
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Independent practice explanation verified by the GateAI team. GATE is conducted by the IITs; question text follows the official paper.
