XK0-005 Exam Dumps | After connecting to a remote host via SSH, an administrator attempts to run an application but receives

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CompTIA.XK0-005.v2025-07-07.q176
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Question 67/176

After connecting to a remote host via SSH, an administrator attempts to run an application but receives the following error:
[user@workstation ~]$ ssh admin@srv1
Last login: Tue Mar 29 18:03:34 2022
[admin@srvl ~] $ /usr/local/bin/config_manager
Error: cannot open display:
[admin@srv1 ~] $
Which of the following should the administrator do to resolve this error?

A. Disconnect from the SSH session and reconnect using the ssh -x command.

B. Add Options X11 to the /home/admin/.ssh/authorized_keys file.

C. Open port 6000 on the workstation and restart the firewalld service.

D. Enable X11 forwarding in /etc/ssh/ssh_config and restart the server.

Correct Answer: A

The error indicates that the application requires an X11 display, but the SSH session does not forward the X11 connection. To enable X11 forwarding, the administrator needs to use the ssh -X option, which requests X11 forwarding with authentication spoofing. This will set the DISPLAY environment variable on the remote host and allow the application to open a window on the local display.
References
* CompTIA Linux+ (XK0-005) Certification Study Guide, page 314
* Open a window on a remote X display (why "Cannot open display")?, answer by Gilles 'SO- stop being evil'

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