Which networking tasks are feasible when a DNS server is configured?

When a DNS server is configured in a network environment, one of the primary tasks it facilitates is the resolution of hostnames to IP addresses, which is crucial for various network services. This functionality is demonstrated in the correct choice, as signature downloads and CFS (Content Filtering Service) server name resolution both rely on DNS to function effectively.

For signature downloads, the firewall needs to reach out to specific update servers identified by hostnames. The DNS server translates these hostnames into IP addresses, allowing the firewall to connect and download the necessary updates. Similarly, when utilizing CFS, the firewall must resolve remote server names to manage content filtering. Without DNS, these processes would be hindered since the services cannot translate user-friendly names into machine-readable IP addresses.

While other options mention tasks related to networking, they do not directly connect to the roles performed by a DNS server in the context of name resolution. Only the first option is directly relevant to DNS functionality, making it the valid choice.