What are the standard ports used for FTP?

What are the standard ports used for FTP?

• A. 21, 22
• B. 20, 21
• C. 23, 25
• D. 25, 80

Answer: (B)

The standard ports used for File Transfer Protocol (FTP) are 20 and 21. Port 21 is the command port used to establish and manage the FTP connection, allowing commands to be sent from the client to the server. Port 20 is utilized for the actual data transfer in active mode FTP. When a file is being transferred, this port is responsible for sending the data from the server back to the client. Understanding these ports is crucial for network configuration and troubleshooting. For example, if a firewall is blocking port 21, clients will be unable to send commands to the FTP server, and if port 20 is blocked, the actual file transfer will fail. Therefore, knowledge of these standard ports is fundamental in managing FTP services effectively.

The standard ports used for File Transfer Protocol (FTP) are 20 and 21. Port 21 is the command port used to establish and manage the FTP connection, allowing commands to be sent from the client to the server. Port 20 is utilized for the actual data transfer in active mode FTP. When a file is being transferred, this port is responsible for sending the data from the server back to the client.

Understanding these ports is crucial for network configuration and troubleshooting. For example, if a firewall is blocking port 21, clients will be unable to send commands to the FTP server, and if port 20 is blocked, the actual file transfer will fail. Therefore, knowledge of these standard ports is fundamental in managing FTP services effectively.