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Palo Alto Networks Certified Network Security Engineer (PCNSE) · Palo Alto Networks
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B is correct
B "If you choose Auto Key, specify the following:" "Enable Replay Protection—Select to protect against replay attacks. The anti-replay protocol is used to prevent hackers from injecting or making changes in packets that travel from a source to a destination and uses a unidirectional security association in order to establish a secure connection between two nodes in the network." Src: https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-web-interface-help/network/network-ipsec-tunnels/ipsec-tunnel-general-tab