LPIC-2 Network Client Management Practice Question
This LPIC-2 practice question tests your understanding of network client management. 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.
Exhibit
Refer to the exhibit.
passwd: files ldap
group: files ldap
shadow: files ldap
netgroup: ldap
A new user has been added to the LDAP directory, but the user cannot log in. The admin confirms the LDAP server is reachable and the user entry exists. Which of the following is the most likely missing configuration?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The PAM configuration does not include pam_ldap.
D is correct because even if the LDAP server is reachable and the user entry exists, the system must be configured to use LDAP for authentication. PAM (Pluggable Authentication Modules) controls how authentication is performed; without pam_ldap (or pam_ldap.so) in the PAM stack, the system will not consult the LDAP server during login, so authentication fails regardless of the LDAP directory contents.
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.
✗
The LDAP server does not have the correct schema for the user.
Why it's wrong here
If the user entry exists, schema is likely correct.
✗
The nscd cache is stale and needs to be cleared.
Why it's wrong here
Caching may delay recognition but authentication would still work after cache flush.
✗
The nsswitch.conf file should have 'ldap' before 'files' for passwd.
Why it's wrong here
The order affects resolution but not authentication; the user entry exists and is found via 'files ldap'.
✓
The PAM configuration does not include pam_ldap.
Why this is correct
PAM is responsible for authentication; without pam_ldap, LDAP users cannot authenticate.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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 confuse name service resolution (nsswitch.conf) with authentication (PAM), assuming that if getent shows the user, login should work, but PAM is the gatekeeper for authentication and must be explicitly configured.
Detailed technical explanation
How to think about this question
Under the hood, PAM modules like pam_ldap (or pam_ldap.so) are invoked during the auth, account, password, and session stacks. The auth stack typically uses pam_ldap to bind to the LDAP server and verify the user's password via a simple bind or SASL mechanism. A common real-world scenario is that an admin configures nsswitch.conf and verifies getent passwd shows the LDAP user, but forgets to add pam_ldap to /etc/pam.d/system-auth or /etc/pam.d/sshd, leading to 'Permission denied' even though the user exists.
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 LPIC-2 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.
Network Client Management — This question tests Network Client Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The PAM configuration does not include pam_ldap. — D is correct because even if the LDAP server is reachable and the user entry exists, the system must be configured to use LDAP for authentication. PAM (Pluggable Authentication Modules) controls how authentication is performed; without pam_ldap (or pam_ldap.so) in the PAM stack, the system will not consult the LDAP server during login, so authentication fails regardless of the LDAP directory contents.
What should I do if I get this LPIC-2 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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