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 service operates over port 587?

SMTP
IMAP
POP3
SSH

The correct answer is: SMTP

Port 587 is widely recognized as the standard port for SMTP (Simple Mail Transfer Protocol) used for sending email securely. SMTP facilitates the transmission of emails across networks, allowing users to send messages from their email clients to email servers. This port was designated for email submission to ensure that messages are sent over a secure and authenticated connection, often utilizing encryption protocols like STARTTLS. The other services listed operate over different ports: IMAP (Internet Message Access Protocol) typically uses port 143, POP3 (Post Office Protocol version 3) commonly operates on port 110, and SSH (Secure Shell) typically runs on port 22. Understanding these port assignments is critical for configuring firewalls and other network security measures, as each service has its own designated purpose and security requirements.