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In IPSec, if the communication is to be gateway-to-gateway or host-to-gateway:
Correct Answer: A
Explanation/Reference: Explanation: In IPSec tunnel mode, the entire IP packet is encrypted and/or authenticated. It is then encapsulated into a new IP packet with a new IP header. Tunnel mode is used to create virtual private networks for network-to- network communications (e.g. between routers to link sites), host-to-network communications (e.g. remote user access) and host-to-host communications. Incorrect Answers: B: Tunnel mode, not transport mode, must be used. C: Tunnel mode, not ESP authentication, must be used. D: Only tunnel mode can be used. References: https://en.wikipedia.org/wiki/IPsec#Tunnel_mode