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GATE CSE 2022 Q35: DNS query-response pairs for iterative resolution of www.gate.org.in

Question

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_____________.

Try it: numerical answer: type the value

Numerical answer. No negative marking.
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Answer: 4 (official GATE 2022 final answer key)

Concept used: In iterative resolution the resolver queries each level of the hierarchy in turn, starting from a root server.

First step: List the servers asked in order: root, then the servers for .in, org.in and gate.org.in.

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Source: official GATE 2022 CS question paper and final answer key, organised by IIT Kharagpur. Question paper · Answer key

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