(b) Distinguish between transport mode and tunnel mode operation in IP security? ( $\mathbf{3} \boldsymbol{\times} \mathbf{2 0} \boldsymbol{=} \mathbf{6 0}$ Marks)
Explanation
Transport mode and tunnel mode are two different modes of operation in IP security. While transport mode encrypts only the payload of the IP packet, tunnel mode encrypts the entire packet, including the header.
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