Which of the following is a security limitation of File Transfer Protocol (FTP)?
A.
Passive FTP is not compatible with web browsers.
B.
Anonymous access is allowed.
C.
FTP uses Transmission Control Protocol (TCP) ports 20 and 21.
D.
Authentication is not encrypted.
Not just the authentication. FTP is a clear text protocol so any file being transferred through it can be sniffed and bad actors can get them.
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and that is reason question says Authentication is not encrypted , because every tom dick and harry knows FTP is a Clear text protocol and asking only for Authentication is not encrypted makes question a little tricky
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