Which ports are commonly associated with FTPS implementations?

The commonly associated ports for FTPS (FTP Secure) implementations are indeed 989 and 990. FTPS is an extension of the File Transfer Protocol (FTP) that adds support for the Transport Layer Security (TLS) and the Secure Sockets Layer (SSL) cryptographic protocols.

Port 990 is typically used for the FTPS command channel, which is initiated using an implicit SSL connection. This means that the connection is expected to be secure from the outset. Port 989, on the other hand, is used for the FTPS data channel, where the actual file transfer occurs, also using an encrypted connection.

In contrast, other options refer to different protocols or services. For instance, ports 21 and 22 are associated with standard FTP and SSH (Secure Shell) protocols, respectively, but do not specifically indicate FTPS. Ports 80 and 443 are associated with HTTP and HTTPS, which are used for web browsing rather than file transfer. Finally, ports 145 and 3306 are related to other services, such as the MySQL database, and have no relevance to FTPS. Thus, the identification of ports 989 and 990 as the standard ports for FTPS is accurate and reflects their specific roles in providing