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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
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Generally, TCP is reliable and UDP is not reliable. DNS which has to b...
UDP is much faster. TCP is slow as it requires 3-way handshake. The load on DNS servers is also an important factor. DNS servers (since they use UDP) don’t have to keep connections.
DNS requests are generally very small and fit well within UDP segments.
UDP is not reliable, but reliability can be added on the application layer. An application can use UDP and can be reliable by using a timeout and resend at the application layer.
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Generally, TCP is reliable and UDP is not reliable. DNS which has to be reliable uses UDP becausea)UDP is slowerb)DNS servers has to keep connectionsc)DNS requests are generally very small and fit well within UDP segmentsd)None of theseCorrect answer is option 'C'. Can you explain this answer?
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