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Which of the following is NOT true about IPSec Tunnel mode?
Correct Answer: B
Explanation/Reference: Explanation: IPSec Tunnel mode works at the Internet layer, not at the Transport layer. Incorrect Answers: A: In IPSec tunnel mode, the entire IP packet is encrypted and/or authenticated. C: In 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. That is, in tunnel mode, there are two sets of IP headers. D: 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 or for gateway services) and host-to-host communications. References: https://en.wikipedia.org/wiki/IPsec#Tunnel_mode