A network technician suspects issues with domain-name resolution in a client's network. Which software tool should primarily be used to diagnose problems related to DNS resolution?
traceroute
arp
nslookup
ping
The correct answer is "nslookup." This command-line utility is specifically designed to query the Domain Name System (DNS) for information such as hostname-to-IP mappings and other resource records, making it the most direct tool for troubleshooting DNS issues. "ping" tests basic reachability and measures round-trip time but does not reveal DNS records. "traceroute" (or "tracert" in Windows) maps the path packets take to a destination but likewise provides no detailed DNS record data. "arp" inspects or modifies the Address Resolution Protocol cache, which maps IP addresses to MAC addresses on a local network, and is unrelated to DNS.
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