Which component often handles obtaining an IP address to return to a client after a domain name query?

Which component often handles obtaining an IP address to return to a client after a domain name query?

• A. DHCP server
• B. DNS resolver
• C. ARP cache
• D. NTP server

Answer: (B)

Translating a domain name into an IP address is handled by DNS resolution. The DNS resolver takes the domain name, queries DNS servers in the proper order (root, then TLD, then authoritative servers as needed), and returns the corresponding IP address to the client so it can establish a connection. The resolver can be on the client or provided by the network or an ISP, but its job is to perform that name-to-IP lookup and deliver the IP back to the requester. Other options aren’t about this lookup: a DHCP server assigns IP addresses and other network settings, not domain-name translations; the ARP cache stores mappings between IP addresses and MAC addresses after an IP is known for local communication; and an NTP server provides time synchronization, not domain-name resolution.

Translating a domain name into an IP address is handled by DNS resolution. The DNS resolver takes the domain name, queries DNS servers in the proper order (root, then TLD, then authoritative servers as needed), and returns the corresponding IP address to the client so it can establish a connection. The resolver can be on the client or provided by the network or an ISP, but its job is to perform that name-to-IP lookup and deliver the IP back to the requester.

Other options aren’t about this lookup: a DHCP server assigns IP addresses and other network settings, not domain-name translations; the ARP cache stores mappings between IP addresses and MAC addresses after an IP is known for local communication; and an NTP server provides time synchronization, not domain-name resolution.