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What is enabled with AH (authentication header) protocol?
Protection from DOS attack.
Data integrity, data origin authentication, and an optional replay protection service.
Protection from sniffing.
The AH protocol provides authentication of part or all of the contents of a datagram (basic transfer unit associated with a packet-switched network). Through the addition of a header that is calculated based on the values in the datagram - the parts of which are used for the calculation and the placement of the header, depends on the whether the tunnel or tranmsport mode is chosen, and the version of IP (IPv4 or IPv6).
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