What is the primary function of the nslookup tool?

The primary function of the nslookup tool is to query DNS records. This tool is essential for troubleshooting DNS issues because it allows users to interactively send DNS queries to a DNS server and obtain information about various record types, such as A, AAAA, MX, and CNAME records. By using nslookup, technicians can verify whether a domain name resolves to the correct IP address and diagnose problems related to domain name resolution.

For instance, when a user inputs a domain name into nslookup, the tool sends a request to the configured DNS server and retrieves pertinent information. This is critical for ensuring the proper functioning of applications and services that rely on correct domain name resolutions, such as web browsing and email delivery.

Other options listed do not serve as primary functions of nslookup. For example, displaying user account information pertains more to user management tools, configuring network settings relates to system or device configurations, and checking network connectivity is typically done via tools like ping or traceroute. Each of these alternatives has its specific roles, separate from the primary purpose of querying DNS records established by nslookup.