EX200 Configure local storage Practice Question
Exhibit
Refer to the exhibit. # mount | grep /dev/sdc1 /dev/sdc1 on /mnt/backup type ext4 (rw,noexec,nosuid) # cat /etc/fstab | grep sdc1 UUID=12345678-9abc-def0-1234-56789abcdef0 /mnt/backup ext4 defaults 0 0 # df -h /mnt/backup Filesystem Size Used Avail Use% Mounted on /dev/sdc1 100G 50G 50G 50% /mnt/backup
An administrator needs to mount the backup filesystem with the ‘exec’ option temporarily for a one-time script. Which command will remount the filesystem with exec without unmounting?
⚠ Common exam trap
The key trap is that candidates may believe only one syntax is correct for remounting. In reality, both specifying the device and mount point (e.g., mount -o remount,exec /dev/sdc1 /mnt/backup) or just the mount point (mount -o remount,exec /mnt/backup) work. The mount command can identify the filesystem from either identifier.
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
✓
mount -o exec,remount /dev/sdc1 /mnt/backup
Both options B and C are valid commands to remount a filesystem with the exec option without unmounting. Option B specifies both the device and mount point, which is accepted by the mount command when using the remount option. Option C uses only the mount point, which is also sufficient. The remount option allows changing mount options on a live filesystem. Options A and D are invalid: A unmounts and remounts, which is not a single remount operation and could cause issues; D attempts to remount all filesystems with exec, which may not apply correctly and does not target the specific filesystem.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
umount /mnt/backup && mount /mnt/backup
Why it's wrong here
This command unmounts and then remounts the filesystem, but it does not remount with the exec option on its own—it remounts with the default options unless specified. Moreover, this approach is not a single remount operation and may fail if the filesystem is busy. Correct approach is to use remount.
- ✓
mount -o exec,remount /dev/sdc1 /mnt/backup
Why this is correct
This command is correct. It uses the `remount` option to change mount options on an already-mounted filesystem, specifying both the device and mount point. The order of options (exec,remount or remount,exec) does not matter. The filesystem will be remounted with exec enabled.
- ✓
mount -o remount,exec /mnt/backup
Why this is correct
This command is correct. It uses the `remount` option with only the mount point, which is sufficient for the kernel to identify the filesystem and apply the new options. It is a common and valid syntax.
- ✗
mount -a -o exec
Why it's wrong here
This command attempts to remount all filesystems listed in /etc/fstab with exec, which may not apply to the specific backup filesystem if it is not listed or has different options. Also, it does not target the specific mount point /mnt/backup.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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