Which address translation scheme allows a single public IP address to correspond to a single machine on an internal network?

• A. Static Network Address Translation
• B. Dynamic NAT
• C. Port Address Translation
• D. NAT Overload

Answer: (A)

Static NAT provides a fixed one-to-one mapping between an internal private address and a public address, so a single inside machine always appears outside with the same public IP. That exact one-to-one relationship is what the question is asking for. The other methods don’t fit: dynamic NAT maps inside addresses to a pool of public addresses (mappings can change over time and aren’t guaranteed to stay with one machine), while Port Address Translation (NAT overload) uses a single public IP for many internal devices by distinguishing connections with ports.