Which NAT maps a single IP address to another single IP address?

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Multiple Choice

Which NAT maps a single IP address to another single IP address?

The key idea is one-to-one, fixed address translation. Static NAT provides a direct, unchanging mapping between a single private IP and a single public IP. This means the inside host always appears on the outside as the same address, which is essential when a specific internal host must be reachable from the Internet or when you need a stable external address for that host. Dynamic NAT and PAT (NAT overload) handle address translation differently. Dynamic NAT uses a pool of external IPs and assigns one as needed, but the mapping can change over time as sessions start and end. PAT, or NAT overload, multiplexes many internal addresses over a single external IP by using different port numbers, so many inside hosts share one outside address. These approaches are not one-to-one and do not preserve a fixed external address for each internal host, unlike static NAT.

The key idea is one-to-one, fixed address translation. Static NAT provides a direct, unchanging mapping between a single private IP and a single public IP. This means the inside host always appears on the outside as the same address, which is essential when a specific internal host must be reachable from the Internet or when you need a stable external address for that host.

Dynamic NAT and PAT (NAT overload) handle address translation differently. Dynamic NAT uses a pool of external IPs and assigns one as needed, but the mapping can change over time as sessions start and end. PAT, or NAT overload, multiplexes many internal addresses over a single external IP by using different port numbers, so many inside hosts share one outside address. These approaches are not one-to-one and do not preserve a fixed external address for each internal host, unlike static NAT.

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