GATE 2022 CS – Question 35

Computer Networks · Application Layer: DNS and HTTP · 1 mark · Numerical answer

Consider the resolution of the domain name www.gate.org.in by a DNS resolver. Assume that no resource records are cached anywhere across the DNS servers and that iterative query mechanism is used in the resolution. The number of DNS query-response pairs involved in completely resolving the domain name is _____________.

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Correct answer: 4

Explanation

The resolver queries the root server, then the .in TLD server, then the org.in server, then the gate.org.in authoritative server, for 4 query-response pairs.