What is the end result of using DNS with domain names?

• A. Devices can communicate by resolving domain names into IP addresses.
• B. Devices can only communicate using domain names without IPs.
• C. IP addresses are resolved to domain names in all cases.
• D. DNS obviates the need for IP addresses in routing.

Answer: (A)

DNS provides a way to use memorable domain names by turning them into the numeric addresses that networks route to. The end result is that devices can communicate by resolving domain names into IP addresses. In practice, when you access a domain, your device asks a DNS resolver to return the corresponding IP address, and then it uses that address to send packets to the destination.

This isn’t about being unable to use IPs or about always mapping in the opposite direction. Routing still relies on IP addresses, and DNS’s job is to map a name to its IP. Reverse lookups (IP addresses back to domain names) exist, but they aren’t the primary mechanism for delivering traffic. DNS does not eliminate the need for IP addresses in routing.