ITS Cybersecurity Practice Exam – Complete Study Resource

The command-line utility used to determine the public IP addresses mapped to a company's domain name is Nslookup. This tool is specifically designed for querying the Domain Name System (DNS) to obtain domain name or IP address mapping information. It allows users to check the DNS records associated with a specific domain, such as A records (which map a domain to its IP address) or MX records (which define mail exchange servers).

By using Nslookup, you can easily retrieve the IP addresses linked to a given domain name, which is crucial for various network troubleshooting tasks, ensuring the correct mapping of domain names to IP addresses, and verifying DNS records. This capability makes it an essential tool for IT professionals and cybersecurity practitioners when diagnosing networking issues or confirming domain configurations.

Other options serve different purposes: Ping is primarily used to test network connectivity between devices, Traceroute maps the path that data takes to reach a specific destination, and IPconfig displays the current IP configuration and settings of the local machine, but does not resolve domain names to public IP addresses.