The protocol on which DNS application run is: (i) Telnet (ii) UDP (iii

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Module 5: Application Layer & Security

20192m

The protocol on which DNS application run is:
(i) Telnet
(ii) UDP
(iii) HTTP
(iv) None of the above

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Answer: (ii) UDP

Why: DNS primarily uses UDP on port 53 for ordinary queries because its request/response exchanges are short and the low overhead of connectionless UDP gives fast answers. It falls back to TCP only for responses larger than 512 bytes (zone transfers, AXFR); Telnet (port 23) and HTTP (port 80) are unrelated application-layer protocols.

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