Linux Foundation LFCS Exam - Topic 4 Question 105 Discussion

Actual exam question for Linux Foundation's LFCS exam

Question #: 105
Topic #: 4

[All LFCS Questions]

Which run levels should never be declared as the default run level when using SysV init? (Choose TWO correct answers.)

Show Suggested Answer

Suggested Answer: A, E

by Kimberlie at Nov 24, 2025, 08:18 PM

Limited Time Offer

25%

Off

Get Premium LFCS Questions as Interactive Web-Based Practice Test or PDF

Contribute your Thoughts:

Submit Cancel

Detra

20 days ago

Yeah, A and E make sense. Safety first!

upvoted 0 times

...

Lang

25 days ago

But B can be useful for recovery, right?

upvoted 0 times

...

Rasheeda

1 month ago

B is also risky, it's single-user mode.

upvoted 0 times

...

Glory

1 month ago

Agreed! A is shutdown, and E is reboot.

upvoted 0 times

...

Alverta

1 month ago

I think A and E should never be default.

upvoted 0 times

...

Olga

2 months ago

Wow, I didn't know that! Thanks for the heads up!

upvoted 0 times

...

Shalon

2 months ago

1 is single-user mode, definitely not default!

upvoted 0 times

...

Albina

2 months ago

Wait, are you sure about 1? I thought it was safe.

upvoted 0 times

...

Ena

2 months ago

Haha, imagine if your system just rebooted itself every time you logged in. That would be a real party trick!

upvoted 0 times

...

Lorrine

3 months ago

A and E? Really? That's like setting your default to power off or reboot. Not very useful!

upvoted 0 times

...

Refugia

3 months ago

Hmm, I'm gonna go with B and D. Wouldn't want my system stuck in rescue mode or the graphics runlevel.

upvoted 0 times

...

Lawrence

3 months ago

I'd say 1 and 5 are no-go's. Who wants to boot into single-user mode or X11 by default?

upvoted 0 times

...

Kina

3 months ago

Definitely not 0 and 6, those are for shutting down and rebooting the system.

upvoted 0 times

...

Viva

3 months ago

I’m a bit confused about run levels, but I think 0 and 6 are definitely not safe as defaults because they lead to shutdown or reboot.

upvoted 0 times

...

Han

4 months ago

I practiced a similar question last week, and I feel like run levels 0 and 6 are both related to shutdown and reboot, so they shouldn't be defaults.

upvoted 0 times

...

Telma

4 months ago

I'm not entirely sure, but I remember something about run level 1 being for single-user mode, which might not be ideal as a default either.

upvoted 0 times

...

Arlette

4 months ago

Ugh, I'm drawing a blank on the run levels right now. I'll have to guess and hope for the best.

upvoted 0 times

...

Louvenia

4 months ago

I'm feeling pretty confident about this one. I remember learning that certain run levels should never be used as defaults, so I think I can narrow it down.

upvoted 0 times

...

Bernardo

4 months ago

Okay, I've got a strategy for this. I'll start by eliminating the run levels that are clearly not appropriate as defaults, then focus on the remaining options.

upvoted 0 times

...