CREST Practitioner Security Analyst (CPSA) Practice

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Master the CREST Practitioner Security Analyst Exam. Prepare with quizzes and comprehensive study guides that include tips and explanations. Excel in your certification journey!

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Which port is used by the rexec protocol?

Port 23
Port 21
Port 512
Port 80

The correct answer is: Port 512

The rexec protocol, which stands for Remote Execution, uses port 512. This protocol is part of the suite of services that allow users to execute commands on remote computers over the network securely. The use of port 512 is standardized for rexec, ensuring that any software utilizing this protocol will communicate through this specific endpoint. The other port options provided are associated with different protocols and services. For example, port 23 is typically used for Telnet, which is a protocol for text-based communication over the network but does not provide the same level of security as rexec. Port 21 is designated for FTP (File Transfer Protocol), used for transferring files, while port 80 is associated with HTTP (Hypertext Transfer Protocol), which is the foundation of data communication on the web. Therefore, understanding that rexec specifically operates on port 512 is crucial for recognizing its function and ensuring proper configuration of services related to remote command execution.