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Which two protocols are defined by IPsec protocol?
ESP, BGP
AH, SSH
AH, ESP
ICMP, IGMP
The IPsec Transport Mode Authentication Header (AH) provides integrity authentication services to IPsec-capable devices, so they can verify that messages are received intact from other devices. In order to provide confidentiality of the message contents via encryption, AH is not enough however and Encapsulating Security Payload (ESP) protocol must be used. Officially there is a third IPsec protocol: Internet Key Exchange (IKE).
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