_________ mode is used whenever either end of the security association is a security gateway.
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A.
Gateway
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B.
Tunnel
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C.
Encapsulating
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D.
Transport
Correct Answer:
B. Tunnel
Explanation:
Tunnel mode is the correct answer because it is required whenever a security gateway, such as a firewall or router, serves as one of the endpoints of a security association. In this mode, the entire original IP packet is encrypted and encapsulated within a new IP packet, which is essential for protecting traffic as it passes through the gateway to its final destination. Conversely, transport mode is typically used for end-to-end communication between two hosts where only the payload is encrypted.
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