What is the purpose of Network Address Translation (NAT) in a local network?

• A. To allow multiple devices on a local network to share a single public IP address.
• B. To provide encryption for internal communications.
• C. To assign local IP addresses automatically via DHCP.
• D. To block all external connections by default.

Answer: (A)

NAT lets many devices on a private local network access the Internet using a single public IP address. It does this by translating each device’s private IP to the router’s public IP for outbound traffic, and it uses port numbers to keep track of each connection so return traffic is delivered to the correct internal device. This preserves public IPv4 addresses and adds a basic layer of obscurity for devices behind the NAT. NAT does not provide encryption by itself—you’d need a VPN or TLS for that. It also doesn’t assign local addresses—that’s DHCP's job. And NAT isn’t a blanket block on external connections; firewall rules determine what inbound traffic is allowed, though many NAT setups restrict unsolicited inbound connections unless ports are forwarded.