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NIELIT 2017 DEC Scientific Assistant A - Section B: 1

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Correct expression tor UDP user datagram length is

  1. length of UDP = length of IP- length of IP header's
  2. length of UDP= length of UDP-length of UDP header's
  3. length of UDP = length of IP+length of IP header's
  4. length of UDP = length of UDP+length of UDP header's
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Answer:  A
Explanation: A user datagram is encapsulated in an IP datagram. There is a field in the IP header that defines the total length of the IP packet. There is another field in the IP header that defines the length of the header. So if we subtract the length of the IP header that is encapsulated in the IP packet, we get the length of UDP datagram.
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