Question Bank - Computer Networks

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A IP packet has arrived in which the fragmentation offset value is 100, the value of HLEN is 5 and the value of total length field is 200. What is the number of the last byte ?

A.
194
B.
394
C.
979
D.
1179

Solution:

Answer: Option 3Data: Fragmentation offset: 100 HLEN: 5total length field: 200Calculation: Header Length: HLEN × 4 ? 5 × 4 ? 20 BytesFragmentation offset: 100 Hence Bytes ahead of this fragment: 100 × 8 = 800 Bytestotal length = 200 ;Hence data part will be 200 - 20 = 180 bytesHence the last byte number will be 800 + 179 = 979Option 3 is the correct answer.

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