XK0-006 System Management Practice Question
A Linux administrator is configuring a persistent mount for a new 2TB XFS filesystem on /dev/sdb1 so it mounts automatically at /data with quota accounting enabled. The administrator edits /etc/fstab and adds the entry, then runs mount -a to validate it. Which fstab field combination correctly applies user and group quota accounting on this XFS mount?
⚠ Common exam trap
The trap here is assuming XFS accepts the same usrquota and grpquota keywords that ext4 uses, when XFS actually requires its own uquota and gquota mount options.
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
✓
/dev/sdb1 /data xfs defaults,uquota,gquota 0 0
XFS uses its own quota mount keywords rather than the legacy ext-family usrquota/grpquota options. Specifying uquota and gquota in the fourth fstab field enables both user and group quota accounting each time the filesystem mounts, which satisfies the requirement for automatic quota enforcement at boot. The remaining options either use unsupported keywords or disable quotas entirely.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
/dev/sdb1 /data xfs defaults,quota 0 0
Why it's wrong here
A bare quota option is not a valid XFS mount keyword for enabling both user and group accounting; XFS expects explicit uquota and gquota (or usrquota equivalents through xfs_quota configuration) to activate the respective quota types. Using quota alone would not enable the group quota accounting the scenario requires, leaving group limits unenforced despite a successful mount.
- ✓
/dev/sdb1 /data xfs defaults,uquota,gquota 0 0
Why this is correct
The XFS driver recognizes uquota and gquota as the correct mount options to activate user and group quota accounting. Placing them in the fourth fstab field ensures the filesystem mounts with quota accounting enabled at boot. After mounting, the administrator still must run xfs_quota to assign limits, but accounting itself is correctly enabled by these options combined with defaults.
- ✗
/dev/sdb1 /data xfs defaults,noquota 0 0
Why it's wrong here
The noquota option explicitly disables quota enforcement on the mount, which is the opposite of what the administrator needs. Even if quotas were previously configured on the filesystem with xfs_quota, this fstab entry would override that and prevent accounting from taking effect. It is used to temporarily bypass quota checks, not to enable user and group quota tracking.
- ✗
/dev/sdb1 /data xfs defaults,usrquota,grpquota 0 0
Why it's wrong here
XFS does not honor the legacy usrquota and grpquota mount keywords inherited from ext-family filesystems; those keywords are silently ignored or rejected by the XFS driver. Quota enforcement on XFS must be enabled through project, user, or group quota options handled by xfs_quota, or the mount option uquota/gquota, so this entry would mount without the intended accounting active.
Go deeper
Related to this question
Learn chapter
User and Group Administration
Key term
Mount
Mounting is the process of making a file system or storage device accessible to a computer's operating system by attaching it to a specific directory in the existing directory tree.
Key term
XFS
XFS is a high-performance 64-bit journaling file system created by Silicon Graphics (SGI) and designed for large files, high throughput, and parallel I/O.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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