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TCP Port Number 21 and How It Works With FTP
Beckhoff Information System - English
FTP server
File Transfer Protocol - FTP
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![Chapter 8] 8.2 File Transfer](https://docstore.mik.ua/orelly/networking/firewall/figs/fire0806.gif "Chapter 8] 8.2 File Transfer")
Chapter 8] 8.2 File Transfer
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