- A
Using the pam_cracklib module
pam_cracklib is the legacy module, still available and functional for password complexity.
- B
Using the passwd command with --stdin
Why wrong: passwd sets a password but does not impose complexity checks unless PAM is configured to do so.
- C
Using the chage command
Why wrong: chage modifies password aging parameters (e.g., minimum/maximum days), not complexity.
- D
Editing the /etc/shadow file manually
Why wrong: The /etc/shadow file stores password hashes and aging info, but does not enforce complexity rules.
- E
Using the pam_pwquality module
pam_pwquality is the modern PAM module for password quality enforcement.
Question 162 of 537
Setting Password Complexity on RHEL Using PAM Modules
This EX200 practice question tests your understanding of manage security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which TWO of the following are valid methods to enforce password complexity requirements on a Red Hat Enterprise Linux 9 system?
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
✓
Using the pam_cracklib module
Option A is correct because the pam_cracklib module is a legacy PAM module that enforces password complexity rules such as minimum length, character classes, and reuse restrictions on RHEL 9. It is invoked via the /etc/pam.d/system-auth and /etc/pam.d/password-auth configuration files, and while deprecated in favor of pam_pwquality, it remains a valid method for enforcing complexity.
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.
- ✓
Using the pam_cracklib module
Why this is correct
pam_cracklib is the legacy module, still available and functional for password complexity.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Using the passwd command with --stdin
Why it's wrong here
passwd sets a password but does not impose complexity checks unless PAM is configured to do so.
- ✗
Using the chage command
Why it's wrong here
chage modifies password aging parameters (e.g., minimum/maximum days), not complexity.
- ✗
Editing the /etc/shadow file manually
Why it's wrong here
The /etc/shadow file stores password hashes and aging info, but does not enforce complexity rules.
- ✓
Using the pam_pwquality module
Why this is correct
pam_pwquality is the modern PAM module for password quality enforcement.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse password aging (managed by chage) with password complexity enforcement, or assume that any password change method (like passwd --stdin) inherently validates complexity, when in fact complexity is only enforced by the configured PAM modules in the authentication stack.
Detailed technical explanation
How to think about this question
Under the hood, both pam_cracklib and pam_pwquality are PAM modules that hook into the password change process via the 'password' stack in /etc/pam.d/system-auth. pam_pwquality uses libpwquality to check passwords against configurable parameters like minlen, dcredit, ucredit, lcredit, ocredit, and enforce retry limits. A subtle behavior is that pam_pwquality can also enforce a minimum number of character classes (e.g., at least one digit, one uppercase) even if the total length is short, which can cause unexpected failures in automated password changes if the policy is not well understood.
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 EX200 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.
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.
- →
Manage security — study guide chapter
Learn the concepts, then practise the questions
- →
Manage security practice questions
Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this EX200 question test?
Manage security — This question tests Manage security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Using the pam_cracklib module — Option A is correct because the pam_cracklib module is a legacy PAM module that enforces password complexity rules such as minimum length, character classes, and reuse restrictions on RHEL 9. It is invoked via the /etc/pam.d/system-auth and /etc/pam.d/password-auth configuration files, and while deprecated in favor of pam_pwquality, it remains a valid method for enforcing complexity.
What should I do if I get this EX200 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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