CISSP Friday-Five Questions: Well-known ports.

On which port does POP3 normally use?

A POP3 server listens on well-known port 110.

Your organization is using a secure website using https://, which port is used by default?

HTTPS URLs begin with "https://" and use port 443 by default, or alternatively 8443, whereas HTTP URLs begin with "http://" and use port 80 by default.

To upload files using FTP which ports would be the common ports?

FTP uses TCP port 20 for FTP data transfer and TCP port 21 for FTP control.

Which well-known ports does email programs use POP3, IMAP, and SMTP

SMTP (Simple Mail Transfer Protocol) uses TCP port 25 as default, but can also use port 2525. POP3 (Post Office Protocol, version 3) uses TCP port 110. IMAP (Internet Message Access Protocol) uses TCP port 143.

Using SSH we log into our cloud servers, which port is assigned to SSH?

The well-known TCP port 22 has been assigned for contacting SSH servers.


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