What tool should an administrator use to test name resolution for inaccessible Internet sites?

Using the dig command is the most appropriate choice for testing name resolution for inaccessible Internet sites. Dig, which stands for "domain information groper," is a powerful command-line utility used in networking to query DNS servers for information. It allows the user to look up DNS records and diagnose problems related to DNS, making it ideal for troubleshooting scenarios where sites are not reachable.

When an administrator needs to confirm if the DNS resolution is functioning correctly for a particular domain, they can use dig to query the relevant DNS records and check if the expected IP address is returned. This capability is especially useful for diagnosing issues that may arise from DNS configuration errors or connectivity issues with specific Internet sites.

The other tools listed serve different purposes. While net view is used for viewing shared resources on the network, ipconfig provides information about the IP configuration of a local machine, and ifconfig serves a similar role in Unix-based systems as a command for configuring network interfaces. These options do not provide the specialized DNS query capabilities that dig offers, making it the ideal choice in this scenario.