Which statement best describes what NAT does in IPv4 networks?

Which statement best describes what NAT does in IPv4 networks?

• A. NAT expands private address space.
• B. NAT converts IPv4 to IPv6.
• C. NAT eliminates the need for DNS.
• D. Private addresses are translated to a public address for Internet access, enabling multiple devices to share one public IP.

Answer: (D)

In IPv4 networks, NAT lets many devices on a private network reach the Internet using a single public IP by translating each private address to that public address (and usually a unique port). This is how several devices share one public IP while accessing external resources. The key idea is translation of private addresses to a public one so outbound Internet traffic can be routed back correctly. That description matches the statement about private addresses being translated to a public address for Internet access, enabling multiple devices to share one public IP. NAT does not expand private address space, nor does it convert IPv4 to IPv6, and it doesn’t make DNS unnecessary. DNS still resolves domain names to IPs, while NAT handles the address translation needed for Internet access.

In IPv4 networks, NAT lets many devices on a private network reach the Internet using a single public IP by translating each private address to that public address (and usually a unique port). This is how several devices share one public IP while accessing external resources. The key idea is translation of private addresses to a public one so outbound Internet traffic can be routed back correctly.

That description matches the statement about private addresses being translated to a public address for Internet access, enabling multiple devices to share one public IP.

NAT does not expand private address space, nor does it convert IPv4 to IPv6, and it doesn’t make DNS unnecessary. DNS still resolves domain names to IPs, while NAT handles the address translation needed for Internet access.