In AH, which mode creates a new IP header for each packet?

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Multiple Choice

In AH, which mode creates a new IP header for each packet?

Explanation:
In AH, the mode that creates a new IP header for each packet is tunnel mode. This mode encapsulates the entire original IP packet inside a new IP packet, so every transmitted packet has a fresh outer IP header added by the tunnel gateway. In contrast, transport mode leaves the original IP header intact and only authenticates the payload (often leaving the outer header unchanged as the packet traverses networks). So the key difference is that tunnel mode wraps the whole packet, producing a new header for each one. (AH provides authentication and integrity; encryption, if needed, would come from pairing with ESP.)

In AH, the mode that creates a new IP header for each packet is tunnel mode. This mode encapsulates the entire original IP packet inside a new IP packet, so every transmitted packet has a fresh outer IP header added by the tunnel gateway. In contrast, transport mode leaves the original IP header intact and only authenticates the payload (often leaving the outer header unchanged as the packet traverses networks). So the key difference is that tunnel mode wraps the whole packet, producing a new header for each one. (AH provides authentication and integrity; encryption, if needed, would come from pairing with ESP.)

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