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ISRO-DEC2017-34

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Generally, TCP is reliable and UDP is not reliable. DNS which has to be reliable uses UDP because

  1. UDP is slower.
  2. DNS servers has to keep connections.
  3. DNS requests are generally very small and fit well within UDP segments.
  4. None of these.
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As maximum size of UDP datagram is 512 Bytes, fit well within UDP segments. Moreover UDP is faster

Answer is C

NB: 

  • DNS uses both TCP and UDP ports 53.
  • For large responses like zone file transfer, TCP 53 will be used not UDP 53.
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