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While hardening a system, an administrator runs a port scan with Nmap, which returned the following output: Which of the following is the best way to address this security issue?
Correct Answer: D
Port 23/tcp indicates Telnet, which is insecure because it transmits data in plaintext. The best hardening approach is to disable and remove the Telnet service entirely, eliminating the vulnerability rather than just blocking it at the firewall. Secure alternatives like SSH should be used instead.
