Final answer:
IPCONFIG /ALL is the correct command to discover a user's IP address, subnet, and DNS details. IPCONFIG displays basic network config, while NETSTAT -A shows active connections and NSLOOKUP is used for querying DNS.
Step-by-step explanation:
The command that allows a user to discover their IP address, subnet, and DNS is IPCONFIG /ALL. This command provides a detailed configuration report for all interfaces, including the host name, primary DNS suffix, node type, IP routing enabled, WINS proxy enabled, DNS server list, and more. While IPCONFIG can show basic information about the network, including the IP address, it doesn't display the DNS details unless the /ALL switch is used. NETSTAT -A displays all active connections and listening ports, which isn't directly related to IP configuration details. Similarly, NSLOOKUP is a network administration command-line tool used for querying the Domain Name System to obtain domain name or IP address mapping, not for viewing the local machine's IP configuration.