Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

While testing file transfers from a workstation behind the company's stateful firewall, you confirm that users can successfully authenticate to an external FTP server but every directory listing and file upload fails when the server is set to active mode. The firewall permits only outbound connections that originate from the internal network and blocks unsolicited inbound traffic. Which technical behavior of active FTP best explains why the transfers are failing?

  • The FTP server initiates the data connection from its TCP port 20 to a random high port on the client, so the firewall blocks the unsolicited inbound traffic.

  • The client must first open a connection to server port 20, but the firewall blocks any outbound connection to ports below 1024.

  • Active mode encrypts the data channel with SSL/TLS, causing the firewall to reject the traffic because it cannot inspect the payload.

  • Active mode attempts to use UDP instead of TCP for the control channel, and the firewall therefore drops the traffic.

CompTIA Linux+ XK0-006 (V8)
Security
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