CREST Practitioner Security Analyst (CPSA) Practice

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Which of the following ports is used by Telnet?

  1. 21

  2. 22

  3. 23

  4. 25

The correct answer is: 23

Telnet uses port 23, which is designated for this protocol, allowing users to remotely access and manage networked devices and systems over a command line interface. This port enables a text-based communication channel between the client and the server, making it a fundamental protocol for remote administration before the advent of more secure protocols like SSH. Understanding port assignments for various protocols is essential in network security, as it helps practitioners identify default services running on devices and assess potential vulnerabilities associated with those services. Other ports listed serve different purposes: port 21 is for FTP, port 22 is for SSH, and port 25 is commonly associated with SMTP for email transmission. Recognizing these distinctions is crucial for effective network management and security analysis.

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