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ISRO | ISRO CS 2017 | Question 34
  • Last Updated : 16 Mar, 2018

Generally TCP is reliable and UDP is not reliable. DNS which has to be reliable uses UDP because
(A) UDP is slower
(B) DNS servers has to keep connections
(C) DNS requests are generally very small and fit well within UDP segments
(D) None of these


Answer: (C)

Explanation: Generally DNS requests are smaller and need to be faster so they use UDP datagrams which has a size of 512 Bytes but when the response data either exceeds 512 Bytes in size or requires to be secure, it also uses TCP.
So option (C) is correct.

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