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.
A Linux client is configured to use PAM for authentication against an LDAP server. The /etc/pam.d/system-auth includes 'auth required pam_ldap.so'. Users can authenticate successfully. However, when a user runs 'id username', it shows 'uid=1000(username) gid=100(users) groups=100(users)' but the LDAP group membership is not shown. Which configuration file is most likely misconfigured?
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 /etc/nsswitch.conf 'group' line does not include 'ldap'.
The 'id' command queries the Name Service Switch (NSS) to resolve user and group information. Even though PAM (via pam_ldap.so) successfully authenticates the user against LDAP, the group membership lookup fails because NSS is not configured to consult LDAP for group data. The /etc/nsswitch.conf file must include 'ldap' in the 'group' line (e.g., 'group: files ldap') to enable the system to retrieve LDAP group memberships.
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 PAM configuration uses 'required' instead of 'sufficient' for pam_ldap.
Why it's wrong here
PAM module order affects auth, not group info.
✗
The /etc/ldap.conf file is missing the 'nss_base_group' line.
Why it's wrong here
But group might still be found if base is set; however, the issue is nsswitch.
✓
The /etc/nsswitch.conf 'group' line does not include 'ldap'.
Why this is correct
Without this, group info comes only from files.
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.
✗
The autofs service is not running.
Why it's wrong here
Unrelated to group membership.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse PAM (authentication) with NSS (name resolution), assuming that successful LDAP authentication automatically means LDAP group lookups work, when in fact they are separate subsystems controlled by different configuration files.
Detailed technical explanation
How to think about this question
Under the hood, PAM handles authentication (verifying credentials), while NSS handles information lookups (like user IDs, group IDs, and group memberships) via libc functions such as getgrnam() and getgrouplist(). The /etc/nsswitch.conf file controls the order and sources for these lookups; without 'ldap' in the 'group' line, the system will only check local files (/etc/group) and possibly other sources like systemd, ignoring LDAP group data entirely. In a real-world scenario, a user might log in successfully (PAM works) but fail to access resources that rely on group-based permissions (e.g., sudo rules or file ACLs) because the group membership is missing.
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 /etc/nsswitch.conf 'group' line does not include 'ldap'. — The 'id' command queries the Name Service Switch (NSS) to resolve user and group information. Even though PAM (via pam_ldap.so) successfully authenticates the user against LDAP, the group membership lookup fails because NSS is not configured to consult LDAP for group data. The /etc/nsswitch.conf file must include 'ldap' in the 'group' line (e.g., 'group: files ldap') to enable the system to retrieve LDAP group memberships.
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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