Continue your lesson
Connect the command you run to the file, process, service, permission, or kernel state it changes.
Block 1 of 1Compare Password aging · Multifactor authentication · Account lock · Restricted shell
Current · 11 min
Compare Password aging · Multifactor authentication · Account lock · Restricted shell
Optional concept notes
Password aging
Requires password changes according to configured lifetime limits.
Multifactor authentication
Requires evidence from more than one authentication factor type.
Account lock
Prevents an identity from authenticating while preserving its record.
Restricted shell
Limits commands in an interactive shell; nologin instead denies interactive login.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Practice the reasoning here
Use a disposable Linux system. Predict a command's effect, run it, inspect exit status and logs, then restore the starting state.
- State the expected result before changing or testing anything.
- Name the observation, command, log, or report that would confirm it.
- Explain why the closest alternative does not fit the same requirement.
Check the whole objective
This unlocks objective 3.4 for recall. The latest checkpoint needs 70% or higher; a lower result puts the lesson back near the front of your timeline.