Which feature best identifies the principal function of the Authentication Header (AH) in IPsec?
It encrypts data payload in each IP packet.
It ensures integrity and authentication of IP packets.
It optimizes network traffic by prioritizing data packets.
It provides high-speed transmission of IP packets.
The Authentication Header primarily provides integrity and authentication of IP packets. It does this by appending a header to each packet, which ensures that the packet has not been altered during transit and that the source is authenticated. While encryption might secure a packet's content, AH does not provide encryption services; that is a function of the Encapsulating Security Payload (ESP). Similarly, AH does not specifically optimize network traffic or enhance transmission speed; these are not functions of the IPsec Authentication Header.
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