To convert a DNS name into an IP address, which component performs the DNS resolution?

To convert a DNS name into an IP address, which component performs the DNS resolution?

• A. The host's operating system
• B. The local DNS cache
• C. The resolver
• D. The edge router

Answer: (C)

DNS resolution is handled by the resolver, the client-side component that translates a hostname into an IP by querying DNS servers. When a system needs an address, the operating system delegates to its resolver, which first checks the local cache for a recent result. If not cached, the resolver queries a recursive DNS server, which may contact root, TLD, and authoritative servers to obtain the IP, then stores the answer in the cache for future use and returns it to the requester. The edge router can act as a DNS forwarder in some setups, but the typical resolution process for a host relies on the resolver on the device or its network-provided resolver. The local DNS cache simply speeds things up by storing previous results, it does not perform the actual resolution by itself.

DNS resolution is handled by the resolver, the client-side component that translates a hostname into an IP by querying DNS servers. When a system needs an address, the operating system delegates to its resolver, which first checks the local cache for a recent result. If not cached, the resolver queries a recursive DNS server, which may contact root, TLD, and authoritative servers to obtain the IP, then stores the answer in the cache for future use and returns it to the requester. The edge router can act as a DNS forwarder in some setups, but the typical resolution process for a host relies on the resolver on the device or its network-provided resolver. The local DNS cache simply speeds things up by storing previous results, it does not perform the actual resolution by itself.