301B: BIG-IP LTM Specialist: Maintain and TroubleshootDemo

By F5 · Question Mode

QuestionQ32

Identify and Resolve LTM Device Issues

Question Image

Refer to the exhibit.

An LTM Specialist is investigating reports that users cannot perform certain commands through an FTP virtual server. Users receive the FTP error, 500 Illegal PORT command. The virtual server is configured to use SNAT automap. The LTM Specialist captures traffic on the server side of the LTM device.

Why does the server return this error?

  • A LIST command disallowed
  • B PORT command disallowed
  • C Active IP address in PORT command
  • D Active IP address in LOGIN command
Explanation

The FTP control connection reaches the server through the SNAT address, but the active-mode PORT command supplies the client’s original address. Because the address specified for the data connection does not match the control connection’s peer address, the FTP server rejects the command as an illegal PORT command.

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