Which protocol is used to resolve domain names to IP addresses?

Which protocol is used to resolve domain names to IP addresses?

• A. Dynamic Host Configuration Protocol
• B. Domain Name System
• C. Address Resolution Protocol
• D. Internet Control Message Protocol

Answer: (B)

Domain Name System is used to resolve domain names to IP addresses. When you type a web address, your device asks a DNS resolver to translate that human-friendly name into the numeric address networks use to reach the server. DNS works as a distributed, hierarchical database with caches to speed lookups, returning the appropriate IPv4 address (A record) or IPv6 address (AAAA record) so the device can establish a connection. Queries typically travel over UDP on port 53, with TCP used for larger responses or special cases. This is distinct from other options: DHCP assigns IP addresses to devices on a local network, ARP maps IP addresses to hardware (MAC) addresses within the same local network, and ICMP handles control messages and diagnostics rather than name-to-address translation.

Domain Name System is used to resolve domain names to IP addresses. When you type a web address, your device asks a DNS resolver to translate that human-friendly name into the numeric address networks use to reach the server. DNS works as a distributed, hierarchical database with caches to speed lookups, returning the appropriate IPv4 address (A record) or IPv6 address (AAAA record) so the device can establish a connection. Queries typically travel over UDP on port 53, with TCP used for larger responses or special cases.

This is distinct from other options: DHCP assigns IP addresses to devices on a local network, ARP maps IP addresses to hardware (MAC) addresses within the same local network, and ICMP handles control messages and diagnostics rather than name-to-address translation.