The Central Admin Dashboard shows that none of your endpoints are using one of your update caches. What command do you use to investigate this?

Using the nslookup command is the appropriate choice for investigating why none of your endpoints are using one of your update caches. nslookup is a network utility that allows you to query Domain Name System (DNS) records to obtain information about hostnames and IP addresses. In the context of update caches, it can help you verify that the endpoints are properly resolving the DNS name of the update cache server. If there are issues with DNS resolution, it may lead to endpoints failing to contact the update cache, which is critical for ensuring that software updates are applied correctly.

This command provides insight into potential misconfigurations in DNS settings or issues with the connectivity to the update cache by confirming whether the endpoint can resolve the network location of the cache. Effective troubleshooting often starts with ensuring that network addresses can be correctly resolved, making nslookup a fundamental tool in this scenario.