The service responsible for resolving names to numerical addresses is the Domain Name System (DNS). If users can access servers by numerical addresses but not by names, it indicates that the DNS service is not functioning. The Dynamic Host Configuration Protocol (DHCP) assigns network addresses to clients; if it were configured incorrectly, clients might not obtain addresses at all. Incorrect subnet masks on client devices would lead to communication issues but not specifically affect name resolution. A down default gateway would prevent access to external networks but would not impact internal name resolution.
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