Question:
Which statement best describes the operation of the File Transfer Protocol?
- An FTP client uses a source port number of 21 and a randomly generated destination port number during the establishment of control traffic with an FTP Server.
- An FTP client uses a source port number of 20 and a randomly generated destination port number during the establishment of data traffic with an FTP Server.
- An FTP server uses a source port number of 20 and a randomly generated destination port number during the establishment of control traffic with an FTP client.
- An FTP server uses a source port number of 21 and a randomly generated destination port number during the establishment of control traffic with an FTP client.
Explanation: When using the File Transfer Protocol, an FTP client uses a randomly generated source port number, but targets a destination port number of 20 or 21 on the FTP server. The destination port numbers depend on whether it is the first connection for control traffic on port 21 or the second connection for data traffic on port 20.
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