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File Transfer Protocol - FTP
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Beckhoff Information System - English
Open ftp port 21 on windows XP operating system - nixCraft
![Chapter 8] 8.2 File Transfer](http://litux.nl/Books/Books/www.leothreads.com/e-book/oreillybookself/tcpip/firewall/figs/fire0806.gif "Chapter 8] 8.2 File Transfer")
Chapter 8] 8.2 File Transfer
IP/Network | ShareTechnote
21/tcp FTP - Enumeration | VK9 Security
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TCP Port Number 21 and How It Works With FTP
FTP Active vs Passive modes
![Chapter 8] 8.2 File Transfer](http://litux.nl/Books/Books/www.leothreads.com/e-book/oreillybookself/tcpip/firewall/figs/fire0807.gif "Chapter 8] 8.2 File Transfer")
Chapter 8] 8.2 File Transfer
Active vs Passive FTP Mode: Which One is More Secure? | securitywing
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FTP | Server Sandbox
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File Transfer Protocol (FTP) in Application Layer - GeeksforGeeks
FTP: a deeper look at an 'Active' file transfer
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