106.2 Graphical Desktops LPIC-1 Practice Questions (Page 6)

Questions 26–30

1. 26expert · hard

   A Linux administrator is troubleshooting a system where the graphical login screen appears, but after a user enters their credentials, the session fails to start and the login screen reappears. The administrator checks the system logs and finds that the user's session script is failing. Which of the following files is most likely to contain the specific error from the user's session startup?

   • A/var/log/Xorg.0.log
   • B~/.xsession-errors
   • C/var/log/auth.log
   • D/etc/X11/xorg.conf
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2. 27expert · hard

   A Linux workstation with an NVIDIA graphics card was working correctly. After a routine system update, the graphical login screen (GDM) appears, but after entering the password, the screen goes black and returns to the login screen. The administrator checks `/var/log/Xorg.0.log` and sees `(EE) NVIDIA(0): Failed to load the NVIDIA kernel module`. The administrator also notices that the `nvidia` kernel module is not listed in `lsmod`. Which of the following is the most likely cause and the best first step to resolve the issue?

   • AThe X server is using the wrong display; the administrator should set `DISPLAY=:1` in GDM's configuration.
   • BThe X server configuration file is corrupted; the administrator should delete `/etc/X11/xorg.conf` and restart GDM.
   • CThe NVIDIA kernel module is incompatible with the updated kernel; the administrator should reinstall the NVIDIA driver package that matches the new kernel.
   • DThe display manager is misconfigured; the administrator should switch from GDM to LightDM.
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4. 28foundation · easy

   Which of the following is an example of a window manager?

   • ALightDM
   • BGNOME
   • CKDE Plasma
   • DOpenbox
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5. 29foundation · easy

   What does the DISPLAY environment variable specify?

   • AThe path to the X server configuration file
   • BThe name of the window manager to run
   • CThe IP address of the X server and the display number
   • DThe type of video driver to use
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6. 30application · medium

   A security-conscious administrator wants to allow a remote user to run X applications on the local display using SSH X11 forwarding. The administrator is concerned about security and wants to ensure that only the authenticated remote user can access the display. Which configuration should the administrator use?

   • AEnable `X11Forwarding yes` in `/etc/ssh/sshd_config` and use `ssh -X` from the remote client.
   • BSet the `DISPLAY` environment variable on the remote machine to the local machine's IP address.
   • CUse `xauth` to manually copy the local cookie to the remote user's home directory.
   • DRun `xhost +` on the local machine before allowing the remote user to connect.
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