CompTIA: Advanced Security Practitioner (CASP) Exam Prep

Answer: D - Overloading NAT uses port-based mappings to ensure that the external structure is entirely different from the internal network structure.

Key Takeaway: The overloading NAT technique allows a single public address to differentiate between sessions according to port number. This is also known as Port Address Translation. When a client on the internal network wishes to access the Internet, the computer forwards the request to its configured gateway-the router running NAT. The router will translate the source address and port number of the packet to use the router’s public IP address and the same port number and then forward the new packet to the destination host.