This LPIC-2 practice question tests your understanding of file sharing and samba. 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 Samba share uses the 'acl_xattr' VFS module to store NT ACLs in extended attributes. The administrator runs 'getfattr -d /srv/share/file.txt' and sees no system attributes related to NT ACLs. What is the most likely cause?
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 filesystem is not mounted with the 'user_xattr' option.
The 'acl_xattr' VFS module stores NT ACLs in extended attributes within the 'system' namespace. If 'getfattr -d' shows no system attributes, the most likely cause is that the underlying filesystem is not mounted with the 'user_xattr' option, which is required to enable extended attribute support. Without this mount option, the filesystem cannot store or retrieve extended attributes, so the NT ACL data is not persisted.
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 VFS module is not loaded globally.
Why it's wrong here
The VFS module can be loaded per share, and it may be configured correctly.
✓
The filesystem is not mounted with the 'user_xattr' option.
Why this is correct
Extended attributes require the user_xattr mount option.
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 share does not have 'nt acl support = yes' set.
Why it's wrong here
This parameter enables NT ACL translation, but xattr storage still needs filesystem support.
✗
The file's extended attributes are stored in a different namespace.
Why it's wrong here
NT ACLs are stored in the system.security namespace, which getfattr -d should show.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the 'user_xattr' mount option with the 'user' namespace for extended attributes, assuming it only affects user-defined attributes, when in fact it enables all extended attribute support on the filesystem.
Trap categories for this question
Command / output trap
NT ACLs are stored in the system.security namespace, which getfattr -d should show.
Detailed technical explanation
How to think about this question
Extended attributes in Linux are stored in namespaces such as 'user', 'system', 'security', and 'trusted'. The 'acl_xattr' VFS module uses the 'system' namespace for NT ACLs because it requires privileged access. The 'user_xattr' mount option is a legacy term; modern ext4 and XFS filesystems have extended attribute support enabled by default, but older filesystems or specific mount configurations may require it explicitly. In real-world scenarios, an administrator might forget to add 'user_xattr' to the fstab entry, causing silent failures where Samba accepts ACL changes but they are not persisted.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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.
File Sharing and Samba — This question tests File Sharing and Samba — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The filesystem is not mounted with the 'user_xattr' option. — The 'acl_xattr' VFS module stores NT ACLs in extended attributes within the 'system' namespace. If 'getfattr -d' shows no system attributes, the most likely cause is that the underlying filesystem is not mounted with the 'user_xattr' option, which is required to enable extended attribute support. Without this mount option, the filesystem cannot store or retrieve extended attributes, so the NT ACL data is not persisted.
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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