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The FTP network diagram is as follows.

The FTP network diagram is as follows. The FTP server wants to use the 21000 control port to provide external FTP services. The FTP client cannot access the FTP server.

A.

port mapping function is not used. The packets sent from the FTP client to the FTP server on port 21000 are ordinary packets and are not recognized as FTP packets.

B.

The firewall can only recognize the FTP traffic of port 21 and cannot identify the FTP traffic of port 21000.

C.

is not configured with ASPF function

D.

device dropped all UDP traffic

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