Which system resolves hostnames to IP addresses?

Which system resolves hostnames to IP addresses?

• A. ADNS
• B. DNS
• C. CAS
• D. WEB PROXY

Answer: (B)

The ability to convert a human-friendly domain name into the numeric IP address a device uses to reach a resource is provided by DNS. DNS acts like the internet’s phone book, translating names such as example.com into the exact IP address your computer needs to connect. When you try to reach a site, your device asks a DNS resolver, which may query root servers, then top-level domain servers, and finally the authoritative server for that domain to obtain the IP. The result is often cached, so future lookups happen quickly. Other options don’t fit because a web proxy simply forwards requests and doesn’t perform the name-to-address translation, CAS handles authentication rather than addressing, and ADNS isn’t the standard term used for hostname-to-IP resolution in networks.

The ability to convert a human-friendly domain name into the numeric IP address a device uses to reach a resource is provided by DNS. DNS acts like the internet’s phone book, translating names such as example.com into the exact IP address your computer needs to connect. When you try to reach a site, your device asks a DNS resolver, which may query root servers, then top-level domain servers, and finally the authoritative server for that domain to obtain the IP. The result is often cached, so future lookups happen quickly.

Other options don’t fit because a web proxy simply forwards requests and doesn’t perform the name-to-address translation, CAS handles authentication rather than addressing, and ADNS isn’t the standard term used for hostname-to-IP resolution in networks.