Which is the default TCP port used in SMTP for non-encrypted communications?
- 25
- 110
- 143
- 993
Explanation: The following TCP ports are used in most common email protocols:
TCP port 25: The default port used in SMTP for non-encrypted communications.
TCP port 465: The port registered by the Internet Assigned Numbers Authority (IANA) for SMTP over SSL (SMTPS).
TCP port 587: The Secure SMTP (SSMTP) protocol for encrypted communications, as defined in RFC 2487, using STARTTLS.
TCP port 110: The default port used by the POP3 protocol in non-encrypted communications.
TCP port 995: The default port used by the POP3 protocol in encrypted communications.
TCP port 143: The default port used by the IMAP protocol in non-encrypted communications.
TCP port 993: The default port used by the IMAP protocol in encrypted (SSL/TLS) communications.
Exam with this question: 5.3.3 Quiz - Exploiting Wired and Wireless Networks Answers
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