The NAT traversal definition:
A. Pending
B. Other
Correct Answer: A
Explanation/Reference:
NAT-T (NAT Traversal)
If both peers support NAT-T, and if they detect that they are connecting to each other through a Network Address Translation (NAT) device (translation is happening), they may negotiate that they want to put a fake UDP port 4500 header on each IPsec packet (before the ESP header) to survive a NAT device that otherwise may have a problem tracking an ESP session (Layer 4 protocol 50).
https://supportforums.cisco.com/document/64281/how-does-nat-t-work-ipsec
Explanation/Reference:
NAT-T (NAT Traversal)
If both peers support NAT-T, and if they detect that they are connecting to each other through a Network Address Translation (NAT) device (translation is happening), they may negotiate that they want to put a fake UDP port 4500 header on each IPsec packet (before the ESP header) to survive a NAT device that otherwise may have a problem tracking an ESP session (Layer 4 protocol 50).
https://supportforums.cisco.com/document/64281/how-does-nat-t-work-ipsec
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