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並前往https://www.nstec.com/network-security/when-i-scan-network-security-on-devices-i-get-services-21-ftp-what-is-this/

when i scan network security on devices i get services 21 ftp ...

What are the FTP TCP ports 21 and 20 used for? Is port 21 a vulnerability? Is there a secure version ...

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