A valid public IPv4 or IPv6 address is needed in order for devices to communicate over the internet.

A valid public IPv4 or IPv6 address is needed in order for devices to communicate over the internet.

• A. A valid public IPv4 or IPv6 address is needed in order for devices to communicate over the Internet.
• B. Private IP addresses are sufficient for Internet communication.
• C. DNS is required for Internet communication.
• D. MAC addresses alone enable Internet routing.

Answer: (A)

To communicate over the Internet, a device needs a globally routable IP address that routers on the Internet can reach. In IPv4, that means a public IP address rather than a private one used inside local networks; private addresses aren’t reachable from outside their local network, though NAT can let many devices share one public address. In IPv6, you typically obtain a globally routable unicast address that serves the same purpose without relying on NAT for end-to-end reachability. DNS helps translate domain names to IPs but isn’t strictly required for connectivity—you can connect directly if you know the numeric IP. MAC addresses remain useful only within a local network segment and aren’t used for routing traffic across the Internet.

To communicate over the Internet, a device needs a globally routable IP address that routers on the Internet can reach. In IPv4, that means a public IP address rather than a private one used inside local networks; private addresses aren’t reachable from outside their local network, though NAT can let many devices share one public address. In IPv6, you typically obtain a globally routable unicast address that serves the same purpose without relying on NAT for end-to-end reachability. DNS helps translate domain names to IPs but isn’t strictly required for connectivity—you can connect directly if you know the numeric IP. MAC addresses remain useful only within a local network segment and aren’t used for routing traffic across the Internet.