This LPIC-2 practice question tests your understanding of file sharing and samba. 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.
A small office uses a Samba server for file sharing. The server is running Samba 4.9 on Ubuntu 18.04. Recently, the administrator added a new user 'john' to the system and added him to the 'staff' group. However, when John tries to access the share 'docs' from his Windows laptop, he gets an 'Access Denied' error. The share configuration is:
[docs]
path = /srv/docs
valid users = @staff
read only = No
create mask = 0644
directory mask = 0755
The administrator verifies that John is a member of the staff group by running 'groups john' which shows staff. Other users in staff can access the share. 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
✓
John's Windows credentials are cached from a previous failed attempt.
Option C is correct because Samba caches user credentials and group memberships at the time of the initial connection. When John first attempted to access the share, Samba cached his credentials (including group membership) before he was added to the staff group. Even though the system now shows John as a member of staff, Samba continues to use the cached credentials, resulting in 'Access Denied'. Clearing the cached credentials on the Windows client (e.g., via 'net use * /delete' or Credential Manager) forces a fresh authentication and group lookup.
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 create mask is too restrictive for John's files.
Why it's wrong here
create mask applies to new files, not access permissions.
✗
The valid users parameter requires the group to be listed with a plus sign for domain groups.
Why it's wrong here
The group is a local UNIX group, not a domain group.
✓
John's Windows credentials are cached from a previous failed attempt.
Why this is correct
Cached credentials can cause access denied; clearing them resolves the issue.
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 Samba service needs to be restarted to reload the group membership.
Why it's wrong here
Samba dynamically reads group membership; restart is not required.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Samba must be restarted or that the share configuration is incorrect, when in fact the issue is client-side credential caching—a subtle but critical detail in Samba troubleshooting.
Detailed technical explanation
How to think about this question
Samba uses the 'smbd' daemon to handle file sharing, and it relies on the system's NSS for user and group lookups. However, Windows clients cache credentials and session tokens (including group SIDs) for the duration of the SMB session. When a user is added to a new group, the cached token on the Windows client does not automatically update; the client must re-authenticate to obtain a new token. This is a common issue in mixed environments where group membership changes are not immediately reflected in active SMB sessions.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: John's Windows credentials are cached from a previous failed attempt. — Option C is correct because Samba caches user credentials and group memberships at the time of the initial connection. When John first attempted to access the share, Samba cached his credentials (including group membership) before he was added to the staff group. Even though the system now shows John as a member of staff, Samba continues to use the cached credentials, resulting in 'Access Denied'. Clearing the cached credentials on the Windows client (e.g., via 'net use * /delete' or Credential Manager) forces a fresh authentication and group lookup.
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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