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Module 5: Application Layer & Security

20242m

What does port number 143 refer to?
(i) SMTP
(ii) IMAP
(iii) FTP
(iv) POP

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Answer: (ii) IMAP

Port 143 is the well-known port of IMAP (Internet Message Access Protocol), which a mail client uses to reach a mailbox on a server and download/manage messages and folders. IMAP secured with TLS uses port 993.

The other options use different standard ports: SMTP = 25 (i), FTP = 21 for the control connection and 20 for the data connection (iii), and POP3 = 110 (iv).

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