Question 442 of 750

Linux Commands and File Permissions →mediumMultiple ChoiceObjective-mapped

Troubleshooting Missing Group Write Permission on Shared Directory

This 220-1202 practice question tests your understanding of linux commands and file permissions. 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 help desk ticket states that a user cannot write to a shared directory /data/projects. The directory permissions are drwxr-xr-x and the user is in the 'staff' group. The directory's group owner is 'staff'. 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.

A
The user does not have read permission on the directory.
Why wrong: The directory has read for group (r-x), so the user can read the directory listing.
B
The directory lacks group write permission.
The group has r-x, meaning no write permission; adding group write (chmod g+w) would resolve the issue.
C
The user is not the owner of the directory.
Why wrong: Being the owner is not required; group membership should suffice if group permissions are set correctly.
D
The sticky bit is set on the directory.
Why wrong: The sticky bit (shown as 't' in permissions) prevents users from deleting others' files, but it does not prevent writing.

Full breakdown with real-world context →

Quick Answer

The answer is that the directory lacks group write permission. This is the most likely cause because the directory’s permission string drwxr-xr-x grants the owning group ‘staff’ only read and execute (r-x) access, not write (w). Since the user belongs to the ‘staff’ group, they are subject to these group-level permissions, and without the write bit, they cannot create, delete, or modify files inside /data/projects. On the CompTIA A+ Core 2 220-1202 exam, this scenario tests your understanding of Linux file permission syntax and the distinction between owner, group, and others—a common trap is confusing execute with write, or assuming membership in the group bypasses missing group write. Remember that the group permission triplet must include w for any group member to write, regardless of the owner’s permissions. A useful mnemonic: “If the group lacks w, the group can’t do.”

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

✓

The directory lacks group write permission.

The directory permissions are drwxr-xr-x, which means the owner has read, write, and execute (rwx), the group has read and execute (r-x), and others have read and execute (r-x). Since the user is in the 'staff' group and the directory's group owner is 'staff', the user's effective permissions are the group permissions, which lack write (w). Therefore, the user cannot write to the directory. Option B correctly identifies that the directory lacks group write permission.

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 user does not have read permission on the directory.
Why it's wrong here
The directory has read for group (r-x), so the user can read the directory listing.
✓
The directory lacks group write permission.
Why this is correct
The group has r-x, meaning no write permission; adding group write (chmod g+w) would resolve 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 user is not the owner of the directory.
Why it's wrong here
Being the owner is not required; group membership should suffice if group permissions are set correctly.
✗
The sticky bit is set on the directory.
Why it's wrong here
The sticky bit (shown as 't' in permissions) prevents users from deleting others' files, but it does not prevent writing.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The CompTIA A+ exam often tests the misconception that being a member of the group that owns a directory automatically grants write access, but candidates overlook that the group permissions must explicitly include the write bit (w) for the user to write to the directory.

Trap categories for this question

Command / output trap
The sticky bit (shown as 't' in permissions) prevents users from deleting others' files, but it does not prevent writing.

Detailed technical explanation

How to think about this question

In Linux, directory write permission controls the ability to create, rename, or delete files within that directory, regardless of file ownership. The execute permission on a directory is required to traverse it and access files inside. The group permissions (r-x) here allow reading and traversing but not modifying the directory's contents. A common real-world scenario is a shared project directory where the group needs write access to collaborate; without 'w', users can view files but cannot add or modify them.

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 220-1202 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.

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FAQ

Questions learners often ask

What does this 220-1202 question test?

Linux Commands and File Permissions — This question tests Linux Commands and File Permissions — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The directory lacks group write permission. — The directory permissions are drwxr-xr-x, which means the owner has read, write, and execute (rwx), the group has read and execute (r-x), and others have read and execute (r-x). Since the user is in the 'staff' group and the directory's group owner is 'staff', the user's effective permissions are the group permissions, which lack write (w). Therefore, the user cannot write to the directory. Option B correctly identifies that the directory lacks group write permission.

What should I do if I get this 220-1202 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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