XK0-006 pam-auth-update Practice Question
After modifying a PAM configuration file for sshd, a user reports they cannot log in. Which command can be used to verify the syntax of the PAM configuration without affecting running services?
⚠ Common exam trap
The trap is that candidates may think `pam_unix -t` is a syntax checker, but it is not. The appropriate command for syntax validation is `pam-auth-update --package`.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
pam-auth-update --package [wrong]
The `pam-auth-update --package` command is used to verify the syntax of PAM configuration files without affecting running services. It checks the configuration and reports any errors. This is the correct tool for syntax checking, whereas `pam_unix -t` does not validate syntax—it tests authentication against the pam_unix module. `pam_tally2` and `pam_faillock` are for account lockout management.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
pam_unix -t [CORRECT]
Why it's wrong here
`pam_unix -t` tests authentication against the pam_unix module; it does not validate PAM configuration syntax.
- ✓
pam-auth-update --package [wrong]
Why this is correct
`pam-auth-update --package` is the correct command to verify PAM configuration syntax without affecting running services.
- ✗
pam_tally2 --check [wrong]
Why it's wrong here
`pam_tally2 --check` is used for managing login failure counts, not syntax checking.
- ✗
pam_faillock --test [wrong]
Why it's wrong here
`pam_faillock --test` is related to account lockout settings, not syntax validation.
Visual reference
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Related to this question
Learn chapter
Installing Linux and Package Management
Key term
PAM
Privileged Access Management (PAM) is a security framework that controls, monitors, and audits access to critical systems and accounts with elevated permissions.
Key term
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the XK0-006 exam.