The NAT firewall places only the internal socket in the translation table.

• A. True
• B. False
• C. Cannot be determined
• D. Only the external socket is placed in the translation table

Answer: (B)

In NAT, each translation entry binds an internal socket to a translated external socket. The device uses this pairing to rewrite outgoing packets from the internal host and, on the return path, to translate the external destination back to the correct internal host. This tracking is essential, especially with port address translation, where many internal connections share one external IP but use different ports. If only the internal socket were stored, the NAT wouldn’t know which internal host to deliver an incoming packet to or how to reverse the translation, breaking the connection. So the statement is false.