- A
pam_unix -t
Why wrong: No such option; pam_unix is a module, not a command.
- B
pam-auth-update --package
On Debian systems, this command can reconfigure PAM and validate module entries.
- C
pam_tally2 --check
Why wrong: Checks failed login counts, not syntax.
- D
pam_faillock --test
Why wrong: Tests lockout, not syntax.
Question 223 of 1,000
XK0-005 Security Practice Question
This XK0-005 practice question tests your understanding of security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"which command"Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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
The `pam-auth-update --package` command is used to verify and apply PAM configuration changes without restarting services. It checks the syntax of PAM configuration files and ensures they are valid, preventing lockouts like the one described. This is the correct tool for testing PAM syntax in Debian-based systems, as it integrates with the system's PAM profile management.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
Why it's wrong here
No such option; pam_unix is a module, not a command.
- ✓
pam-auth-update --package
Why this is correct
On Debian systems, this command can reconfigure PAM and validate module entries.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
pam_tally2 --check
Why it's wrong here
Checks failed login counts, not syntax.
- ✗
pam_faillock --test
Why it's wrong here
Tests lockout, not syntax.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse PAM module commands (like `pam_tally2` or `pam_faillock`) with syntax validation tools, or assume `pam_unix` can be run as a standalone command for testing.
Trap categories for this question
Command / output trap
No such option; pam_unix is a module, not a command.
Detailed technical explanation
How to think about this question
PAM configuration files (e.g., `/etc/pam.d/sshd`) are parsed at runtime by the PAM library; syntax errors can cause authentication failures. The `pam-auth-update` command, part of the `libpam-runtime` package, manages PAM profiles and validates changes by running `pam-auth-update --package` to ensure the configuration is coherent before applying it. In real-world scenarios, administrators often test changes on a secondary session to avoid lockouts, as syntax errors can silently break authentication.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the XK0-005 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Visual reference
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Security — study guide chapter
Learn the concepts, then practise the questions
- →
Security practice questions
Targeted practice on this topic area only
- →
All XK0-005 questions
1,000 questions across all exam domains
- →
CompTIA Linux+ XK0-005 study guide
Full concept coverage aligned to exam objectives
- →
XK0-005 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related XK0-005 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Security practice questions
Practise XK0-005 questions linked to Security.
Troubleshooting practice questions
Practise XK0-005 questions linked to Troubleshooting.
Scripting, Containers, and Automation practice questions
Practise XK0-005 questions linked to Scripting, Containers, and Automation.
System Management practice questions
Practise XK0-005 questions linked to System Management.
Scripting, Containers and Automation practice questions
Practise XK0-005 questions linked to Scripting, Containers and Automation.
XK0-005 fundamentals practice questions
Practise XK0-005 questions linked to XK0-005 fundamentals.
XK0-005 scenario practice questions
Practise XK0-005 questions linked to XK0-005 scenario.
XK0-005 troubleshooting practice questions
Practise XK0-005 questions linked to XK0-005 troubleshooting.
Practice this exam
Start a free XK0-005 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this XK0-005 question test?
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: pam-auth-update --package — The `pam-auth-update --package` command is used to verify and apply PAM configuration changes without restarting services. It checks the syntax of PAM configuration files and ensures they are valid, preventing lockouts like the one described. This is the correct tool for testing PAM syntax in Debian-based systems, as it integrates with the system's PAM profile management.
What should I do if I get this XK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This XK0-005 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 XK0-005 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.