Question

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

(a) 880

(b) 879

(c) 881

(d) 801

The question was asked in homework.

The above asked question is from Overview in division Wireless Network Security and Network Security Overview of Cryptograph & Network Security

Answer 1

Correct answer is (b) 879

The explanation is: Total data bytes = total length – header length = 80 bytes in this datagram.

Last byte is therefore 879.