You work as a Network Administrator of a TCP/IP network. You are having DNS resolution problem. Which of the following utilities will you use to diagnose the problem?

IPCONFIG displays the local machine's IP configuration including the configured DNS server address, but it cannot query DNS records or test resolution behavior.

PING tests basic ICMP connectivity to a host and can incidentally trigger a DNS lookup, but it does not provide detailed DNS diagnostic information.

TRACERT traces the routing path to a destination and identifies routing hops, but it does not diagnose or display DNS resolution details.

NSLOOKUP allows an administrator to query DNS servers directly, test forward and reverse lookups, specify alternate DNS servers, and examine DNS records such as A, MX, and NS entries. This makes it the definitive tool for isolating whether a DNS resolution failure is caused by misconfigured records, an unreachable server, or incorrect client DNS settings.