Discussion
Which of the following describes an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer 3 Network layer of the OSI model?
Answer: D
Correct answer: IPSec
IPSec is the standardised suite - AH, ESP and IKE with their associated algorithms - that provides authentication, integrity and encryption at the Network layer, so it protects any traffic carried over IP without the applications needing to know. That layer 3 position is exactly what distinguishes it from TLS, which secures individual transport connections.
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