What is NAT in the context of a router and how does it help with IPv4 address conservation?

What is NAT in the context of a router and how does it help with IPv4 address conservation?

• A. NAT translates private IPv4 addresses to public addresses for outbound traffic, conserving public addresses.
• B. NAT translates public addresses to private addresses only for inbound traffic.
• C. NAT increases the number of public addresses needed.
• D. NAT only applies to IPv6.

Answer: (A)

NAT lets devices on a private network share a single public IPv4 address when they access the Internet. It does this by translating each device’s private IP to a public IP (often the same public address) for outbound traffic, with unique port numbers to keep track of multiple connections. The router then uses its NAT table to map the responses back to the correct private device, so each internal host can communicate as if it had its own public address. This sharing is how IPv4 address conservation is achieved because you don’t need a unique public address for every device. The described behavior matches NAT’s purpose: private-to-public translation for outbound traffic that enables many devices to appear under one public address. The other statements don’t fit NAT’s role: it isn’t about translating public to private only for inbound traffic, it doesn’t increase the number of public addresses needed, and NAT is a feature of IPv4 networks rather than something limited to IPv6.

NAT lets devices on a private network share a single public IPv4 address when they access the Internet. It does this by translating each device’s private IP to a public IP (often the same public address) for outbound traffic, with unique port numbers to keep track of multiple connections. The router then uses its NAT table to map the responses back to the correct private device, so each internal host can communicate as if it had its own public address. This sharing is how IPv4 address conservation is achieved because you don’t need a unique public address for every device.

The described behavior matches NAT’s purpose: private-to-public translation for outbound traffic that enables many devices to appear under one public address. The other statements don’t fit NAT’s role: it isn’t about translating public to private only for inbound traffic, it doesn’t increase the number of public addresses needed, and NAT is a feature of IPv4 networks rather than something limited to IPv6.