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Which of the following is/are correct regarding IPV4 Datagram Header?

  1. The minimum length of HLEN field is 5 and maximum is 20.
  2. Total length field has a minimum value of 20 Bytes and maximum of 65516 Bytes
  3. Fragmentation offset maximum value is 65514 Bytes.
  4. None of the above
ago in Computer Networks by (45 points) | 40 views
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only c)
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How is C possible ?
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my bad, i think none is correct so option d)
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No actually they gave c. But how is c possible ? The Fragmentation offset size is of 13 bits only which can have a maximum value of 8191 i.e., 8191 * 8 = 65528 Bytes.
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1 Answer

+1 vote
  1. Header length (20 B to 60 B) so HLEN can go from 5 to 15 .
  2. Total length (16-bit) means total length of  packet ( including Header and Data). The minimum size is 20 bytes (header without data) and the maximum is 65,535 bytes.
  3. Fragmentation offset 13 bit : Maximum fragment offset possible = (65535 – 20) – 1 = 65514 where 65535 is maximum size of datagram and 20 is minimum size of IP header. so Option C is true.
ago by (187 points)
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why  -1 subtracted ?
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