What does transport mode do?

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Study for the WGU ITAS 2142 D830 Introduction to Cryptography Exam. Review flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What does transport mode do?

Explanation:
Transport mode protects the data carried by the transport layer by encrypting and optionally authenticating only the payload, while leaving the original IP header visible so routing can still occur. The IPsec ESP header and trailer wrap around that payload, but the outer IP header remains unchanged. This is why it’s described as encrypting the payload only. In contrast, encrypting headers or the entire packet would correspond to other modes, and simply “signing” a packet isn’t what transport mode does.

Transport mode protects the data carried by the transport layer by encrypting and optionally authenticating only the payload, while leaving the original IP header visible so routing can still occur. The IPsec ESP header and trailer wrap around that payload, but the outer IP header remains unchanged. This is why it’s described as encrypting the payload only. In contrast, encrypting headers or the entire packet would correspond to other modes, and simply “signing” a packet isn’t what transport mode does.

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