156-551 · Question #130
Which command would you use to collect debug output only from a specific VS?
The correct answer is C. vsenv followed by fw ctl zdebug. To collect debug output from a specific Virtual System, use vsenv to switch into the VS context, followed by fw ctl zdebug or other relevant commands. This isolates debugging to a single VS without affecting others.
Question
Which command would you use to collect debug output only from a specific VS?
Options
- Atcpdump -i eth0
- Bcpinfo -vs
- Cvsenv followed by fw ctl zdebug
- Dvsx_provisioning_tool debug
How the community answered
(59 responses)- A17% (10)
- B7% (4)
- C73% (43)
- D3% (2)
Explanation
To collect debug output from a specific Virtual System, use vsenv to switch into the VS context, followed by fw ctl zdebug or other relevant commands. This isolates debugging to a single VS without affecting others.
Topics
Community Discussion
10
Anastasia B.Dec 16, 2025The correct answer is C, vsenv followed by fw ctl zdebug. In a VSX environment the gateway runs multiple Virtual Systems, and without first entering the context of the specific VS you want, any debug command you run lands in the context of VS0, the admin VS, not the one you actually care about. Running vsenv with the VS ID shifts your shell context so that subsequent commands, including fw ctl zdebug drop, execute inside that VS and capture only its kernel debug output. The other options do not accomplish context switching at all, tcpdump captures raw traffic on a physical interface, cpinfo with the vs flag pulls system diagnostic info rather than live debug, and vsx_provisioning_tool is for provisioning operations, not debug collection.
Mateus R.Dec 17, 2025Good breakdown, and the way I remember it is that skipping vsenv before fw ctl zdebug is like plugging your headphones into the wrong amp and then wondering why you are hearing the wrong band, because your shell is loyal to whatever VS context it is sitting in, and VS0 will happily give you its own kernel output all day while the VS you actually need to debug stays completely silent.
Nina C.Jan 2, 2026I picked B first because cpinfo sounds like it gathers VS info, but then I remembered vsenv is how you actually enter a specific VS context, and fw ctl zdebug is the debug command you run inside it, so C is the one.
Brenda K.Jan 2, 2026Nina, you nailed the logic but clock yourself on that one next time, because the moment you hear "debug output" on the exam, fw ctl zdebug should fire instantly and you should be circling C in under 20 seconds, no detour through B required.
Lena V.Jan 11, 2026vsenv switches your shell into the context of a specific VS, so every debug command you run after that, including fw ctl zdebug, captures output scoped to that VS only. Running zdebug without vsenv first dumps from the VSX gateway globally, which buries your target traffic in noise from every other VS.
Mateus R.Jan 12, 2026Solid point, and the one trap that bites people after they get this right is forgetting to run vsenv 0 when they are done, because that VS context sticks to the session and your next "global" command is still quietly scoped to the VS you were debugging, which makes it look like traffic vanished.
Mateus R.Dec 27, 2025Think of cpinfo like a mechanic pulling a full diagnostic report on one specific car in a fleet lot, not the whole lot, just that one vehicle. The -vs flag is your way of pointing at the exact Virtual System you care about, so all that debug output gets scoped down tight to that VS and nothing else bleeds in from the other systems sharing the blade. I have seen people overthink this one but cpinfo -vs is right there in the Check Point documentation doing exactly what the question describes, targeted collection from a specific VS, and that is why B is my pick all day.
Anastasia B.Dec 29, 2025Mateus, the analogy is solid but cpinfo -vs scopes the output to a Virtual System context inside VSX, which is not the same as collecting diagnostics from a specific Security Gateway in a multi-gateway environment. For that targeted per-gateway collection, cpinfo -g is the right flag, which is why C is the correct answer here.
Brenda K.Dec 21, 2025Clocking in at under 30 seconds on this one, D is the move. The vsx_provisioning_tool debug command targets a specific VS directly, which is exactly what the question is asking for, so mark D and keep rolling.
Lena V.Dec 22, 2025Hey Brenda, C is actually the one here because vsx_provisioning_tool debug applies to the VSX gateway level, not an individual VS, so the question's scope points you to the command in C that targets the specific virtual system context. Easy mix-up, but the distinction matters on the exam.