Final answer:
The DNS resolver tool provided on all major desktop operating systems is nslookup. It is utilized for querying DNS servers to obtain the IP address associated with a domain name and for troubleshooting DNS issues.
Step-by-step explanation:
The DNS resolver tool available on all major desktop operating systems is nslookup. This tool is used to query Domain Name System (DNS) servers to find the IP address associated with a domain name or vice versa. When you run nslookup, you can specify the domain name or the IP address as well as the DNS server to use for the query. This is a helpful tool for troubleshooting DNS problems and ensuring that domain names are properly resolving to their respective IP addresses.