Type the command, with no arguments and no options, that prints whether host-based access control is currently enabled on your X server together with the list of hosts and users allowed to connect.
LPIC-1 Exam 102-500, objective 106. User interfaces and desktops medium
Machine-checked — no person has signed for it. This question was read against the source cited below by an automated pass, which found no contradiction. That is a weaker claim than it sounds: the same kind of process wrote the question, so it can confirm its own mistake.
Treat it as a good draft rather than as settled fact, and read the source below before you rely on it. It is not used in mock exams here — only questions a person has signed for are.
How these questions are written — where each question comes from, what the verification ledger records, and what happens when one is found wrong.
Answer
Type the answer.
Accepted answer
xhost
Case sensitive — Linux is, and grading LS as ls would teach a falsehood.
Why
Run with no arguments, xhost reports the current state of access control and prints the entries in the host access list. Arguments modify that list: `xhost +hostname` grants a host access, `xhost -hostname` revokes it, and a bare `xhost +` disables access control entirely so any host may connect — a serious risk, since any such client can read your keystrokes and screen contents. Prefer cookie-based authorisation with xauth over loosening xhost.
Where this comes from
- Cited
- manual page xhost(1)
Practise this
Reading one question is not practice. The trainer will draw a short set from objective 106 and space the ones you get wrong.
More questions on this objective
- In the X Window System architecture, which statement correctly describes the roles of the X server and an X client? machine-checked
- From your desktop workstation you run `ssh -X admin@fileserver` and then start `xterm` in that session. The xterm window appears on your workstation's screen. Which machine is running the X server in this arrangement, and which is running the X client? machine-checked
- In a bash shell, type the complete command that sets and exports the environment variable X clients read to find their display, so that they connect to screen 0 of display 0 on the local machine. machine-checked
- An X11-forwarded ssh session authorises the remote client to talk to your local X server without you ever running an xhost command. Which mechanism provides that authorisation? machine-checked
- A display manager is the program that presents the graphical login screen and starts the user's session after authentication. Which three of the following are display managers? (Choose three.) machine-checked
- A user types with one hand and cannot hold Ctrl or Shift down while pressing another key. Which accessibility feature lets a modifier key stay active after it is released, so the next key press is combined with it? machine-checked