What is Nslookup commonly used for?

• A. Testing and troubleshooting domain name servers and displaying DNS resource records
• B. Viewing active network connections
• C. Editing system configuration files
• D. Scheduling tasks

Answer: (A)

Nslookup is a network tool used to query DNS servers to verify how a domain name is resolved and what DNS records exist for that name. It lets you specify a DNS server to use, request different record types (such as A for addresses, AAAA, MX, NS, and others), and view the exact responses, including any errors and TTL details. This makes it a go-to method for testing and troubleshooting domain name resolution, diagnosing DNS issues, and confirming what data a particular server returns.

Other options don’t fit because viewing active network connections is done with tools like netstat or ss, editing system configuration files requires text editors, and scheduling tasks uses task schedulers.