An engineer is configuring IPsec VPN and needs an authentication protocol that is reliable and supports ACK and sequence. Which protocol accomplishes this goal?
ESP provides confidentiality, authentication, and integrity to IP Packets. It does NOT include mechanisms for acknowledging or sequencing messages - which is a requirement for this question. IKEv1 SUPPORTS acknowledgements and sequencing to ensure reliable delivery of messages during the negotiation process.
Ikev1 does authentication and a has a handshake process https://www.cisco.com/c/es_mx/support/docs/security-vpn/ipsec-negotiation-ike-protocols/217432-understand-ipsec-ikev1-protocol.html
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