What is the primary function of NAT in a router?

What is the primary function of NAT in a router?

• A. It maps private IP addresses to a public IP address for Internet access
• B. It translates domain names to IP addresses
• C. It forwards all incoming traffic automatically
• D. It blocks outbound connections

Answer: (A)

NAT’s main job is to translate private IP addresses used inside a local network into a public IP address that can be used on the Internet. When devices in a home or office network reach outward, the router rewrites the source address (and often the source port) to its own public IP and keeps track of each translation in a table. This lets many devices share a single public IP while still receiving the correct responses back to the right private host. NAT also provides a layer of privacy by hiding internal addresses from the outside world and helps address IPv4 address scarcity by multiplexing multiple private addresses onto one public address. Translating domain names to IP addresses is what DNS does, not NAT. NAT doesn’t automatically forward all incoming traffic; inbound access typically requires additional configuration like port forwarding or static NAT. Blocking outbound connections is a function more associated with a firewall, not NAT.

NAT’s main job is to translate private IP addresses used inside a local network into a public IP address that can be used on the Internet. When devices in a home or office network reach outward, the router rewrites the source address (and often the source port) to its own public IP and keeps track of each translation in a table. This lets many devices share a single public IP while still receiving the correct responses back to the right private host. NAT also provides a layer of privacy by hiding internal addresses from the outside world and helps address IPv4 address scarcity by multiplexing multiple private addresses onto one public address.

Translating domain names to IP addresses is what DNS does, not NAT. NAT doesn’t automatically forward all incoming traffic; inbound access typically requires additional configuration like port forwarding or static NAT. Blocking outbound connections is a function more associated with a firewall, not NAT.