Question

In an IP packet, the value of HLEN is 516 and the value of the total length field is 002816.What is the efficiency of this datagram?

(a) 80%

(b) 50%

(c) 66%

(d) 75%

This question was posed to me in a national level competition.

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

Answer 1

Right option is (b) 50%

The explanation: Total number of bytes in the header = 5 x 4 = 20 bytes.

Total length = 0028_16 = 40 bytes.

Data carried by the packet = (40 – 20) = 20 bytes.

Efficiency = payload length / total length = 20/40= 50%.