FTP Architecture
TCP provides a connection-oriented service because FTP uses the Transmission Control Protocol (TCP) at the transport layer. All data exchanged between the server and the client is guaranteed to not only to be delivered, but also to be delivered intact as originally sent. Figure 6.1 diagrams the core functionality of FTP. If this diagram looks all too familiar, feel free to jump ahead to the next section. However, if it looks just vaguely familiar or not at all familiar, take the time to read through the section. Understanding the architecture of FTP not only helps with configuration now, but it also assists in troubleshooting later.
Figure 6.1. TCP is the core transport protocol of FTP.
FTP not only uses TCP port 21 for session ...
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