Which service maps a domain name to the IP address needed to reach a resource?

Which service maps a domain name to the IP address needed to reach a resource?

• A. Dynamic Host Configuration Protocol
• B. Network Address Translation
• C. Domain Name System
• D. Address Resolution Protocol

Answer: (C)

Mapping domain names to IP addresses is the function being tested. The Domain Name System acts as the Internet’s address book, translating human-friendly names like example.com into the numeric addresses that routers use to reach resources. When you type a domain, your device queries DNS servers to obtain the corresponding IP, allowing the connection to proceed. DNS benefits from a hierarchical structure and caching, which speeds lookups and reduces load on root servers. This is why DNS is the mechanism used to reach resources by name. Dynamic Host Configuration Protocol assigns IP addresses to devices on a local network, not domain-name mappings. Network Address Translation translates private IPs to public ones for routing, not names. Address Resolution Protocol maps an IP address to a MAC address on the local network, not domain-name to IP-address resolution.

Mapping domain names to IP addresses is the function being tested. The Domain Name System acts as the Internet’s address book, translating human-friendly names like example.com into the numeric addresses that routers use to reach resources. When you type a domain, your device queries DNS servers to obtain the corresponding IP, allowing the connection to proceed. DNS benefits from a hierarchical structure and caching, which speeds lookups and reduces load on root servers. This is why DNS is the mechanism used to reach resources by name.

Dynamic Host Configuration Protocol assigns IP addresses to devices on a local network, not domain-name mappings. Network Address Translation translates private IPs to public ones for routing, not names. Address Resolution Protocol maps an IP address to a MAC address on the local network, not domain-name to IP-address resolution.