CREST Practitioner Security Analyst (CPSA) Practice

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Which of the following protocols is not associated with port 25?

SMTP
POP3
IMAP
All of the above are correct

The correct answer is: POP3

Port 25 is primarily associated with the Simple Mail Transfer Protocol (SMTP), which is used for sending emails. This protocol operates over port 25 to facilitate the transfer of email messages between mail servers. On the other hand, Post Office Protocol version 3 (POP3) and Internet Message Access Protocol (IMAP) serve different functions in the email ecosystem. Both POP3 and IMAP are primarily used for receiving and managing emails, rather than sending them. POP3 typically uses port 110 (or port 995 for secure connections), while IMAP usually operates over port 143 (or port 993 for secure connections). Given this context, the identification of POP3 as not being associated with port 25 is correct, as it underscores the distinction between protocols designated for sending versus those intended for receiving email. Therefore, the correct answer accurately recognizes that POP3 does not utilize port 25, solidifying its role in email retrieval instead.