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ISRO2014-55

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An IP packet has arrived with the first $8$ bits as $0100 0010.$ Which of the following is correct?

  1. The number of hops this packet can travel is $2$
  2. The total number of bytes in header is $16$ bytes
  3. The upper layer protocol is ICMP
  4. The receiver rejects the packet
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5 Answers

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IP Packet header length = 20B to 60B. Given:

0100 0010
VER HLEN

Version = 4. So IPv4. This is all right.

Header length = 2. HLEN is actually scaled down by the factor of 4.

So, actual HLEN = $2*4=8$. This specifies that the header is of length 8B, which is invalid.

So, Option D

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