Which mechanism translates private IP addresses to one or more public IP addresses to enable internet access and conserve IPv4 address space?

Which mechanism translates private IP addresses to one or more public IP addresses to enable internet access and conserve IPv4 address space?

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

Answer: (A)

Private IP addresses aren’t routable on the public Internet, so a mechanism is needed to translate them to publicly reachable addresses. This is provided by Network Address Translation. A router at the network edge keeps a NAT table that maps each internal private address (and port, if needed) to a public address (and port). As outbound traffic leaves the private network, the source IP (and sometimes port) is rewritten to a public IP so the packet can reach the Internet; responses come back to that public address, and NAT rewrites them back to the original private host. This translation enables Internet access for many devices while conserving IPv4 address space by allowing multiple private hosts to share public addresses. NAT includes several forms: static NAT (one-to-one mapping), dynamic NAT (mapping to a public address pool), and PAT (port address translation), which multiplexes multiple private hosts on a single public IP by using different ports. The broader mechanism described here, NAT, is what makes the translation and address conservation possible.

Private IP addresses aren’t routable on the public Internet, so a mechanism is needed to translate them to publicly reachable addresses. This is provided by Network Address Translation. A router at the network edge keeps a NAT table that maps each internal private address (and port, if needed) to a public address (and port). As outbound traffic leaves the private network, the source IP (and sometimes port) is rewritten to a public IP so the packet can reach the Internet; responses come back to that public address, and NAT rewrites them back to the original private host. This translation enables Internet access for many devices while conserving IPv4 address space by allowing multiple private hosts to share public addresses. NAT includes several forms: static NAT (one-to-one mapping), dynamic NAT (mapping to a public address pool), and PAT (port address translation), which multiplexes multiple private hosts on a single public IP by using different ports. The broader mechanism described here, NAT, is what makes the translation and address conservation possible.