EX200 Create and configure file systems Practice Question
Which TWO of the following are valid mount options for enabling quotas on an ext4 file system?
⚠ Common exam trap
Test-takers frequently confuse the generic `quota` command with a mount option, or misremember the exact option names (e.g., `userquota` instead of `usrquota`), leading them to select incorrect options like `quota` or `userquota`.
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
✓
grpquota
`grpquota` is a valid mount option for enabling group quotas on an ext4 file system. Option E is correct because `usrquota` is the valid mount option for enabling user quotas. Both options are recognized by the `mount` command and the ext4 driver to activate quota tracking at mount time.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
grpquota
Why this is correct
The `grpquota` mount option instructs the kernel to enable per-group quota accounting and enforcement on an ext4 filesystem. When placed in `/etc/fstab` or passed via `mount -o remount,grpquota`, the kernel tracks block and inode usage by group ID and can enforce limits when the `quotaon` utility activates them. This option is used alongside `usrquota` when both user and group limits are required, but it is equally valid by itself.
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quota
Why it's wrong here
The bare `quota` string is not a valid mount option for ext4; the kernel only recognizes the specific `usrquota` and `grpquota` flags. Attempting to mount with `-o quota` will be rejected because `mount(8)` cannot map it to a filesystem-specific option. To enable quota functionality, you must always spell out which quota type you are enabling, either for users, for groups, or for both. This prevents ambiguity and is why a generic "quota" option does not exist.
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userquota
Why it's wrong here
`userquota` is a common but incorrect variant of the ext4 mount option `usrquota`. The kernel parses mount options as exact strings, so `userquota` is not recognized and will cause mount to fail or, at best, be silently ignored. The correct spelling replaces the "er" with an "r" to match the historical `usr` prefix used by the quota system (as in `usrquota` and `aquota.user`). Always verify the exact option name in `man 5 ext4` or `man mount` before writing it into `/etc/fstab`.
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noquota
Why it's wrong here
`noquota` is not a supported mount option on ext4, despite its intuitive appearance. Unlike filesystems such as XFS where `noquota` explicitly disables quota enforcement, ext4 quotas are off by default and only become active when `usrquota` or `grpquota` is present. To disable quotas on an ext4 filesystem after they have been enabled, you simply remount the filesystem without those quota flags rather than passing a "noquota" option. As a result, specifying `noquota` will cause an unknown option error.
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usrquota
Why this is correct
The `usrquota` mount option enables per-user quota accounting and enforcement on an ext4 filesystem. When this flag is set, the kernel records block and inode usage for each user ID and applies the limits defined in the quota database (typically `aquota.user`). It is often paired with `grpquota` to manage both user and group quotas simultaneously, but it can be used alone. After mounting with `usrquota`, you must run `quotaon` to activate the quotas.
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