EX200 Create and configure file systems Practice Question
This EX200 practice question tests your understanding of create and configure file systems. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Exhibit
# ls -l /dev/mapper/
total 0
crw-------. 1 root root 10, 236 Jan 1 00:00 control
lrwxrwxrwx. 1 root root 7 Jan 1 00:00 vg_data-lv_data -> ../dm-0
# vgextend vg_data /dev/sdb3
Volume group "vg_data" successfully extended
# lvextend -L +2G /dev/vg_data/lv_data
Size of logical volume vg_data/lv_data changed from 4.00 GiB (1024 extents) to 6.00 GiB (1536 extents).
Logical volume vg_data/lv_data successfully resized.
# xfs_growfs /data
meta-data=/dev/mapper/vg_data-lv_data isize=512 agcount=4, agsize=262144 blk
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=0
= reflink=1
data = bsize=4096 blocks=1048576, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
reflink = noalign
data blocks changed from 1048576 to 1572864
Refer to the exhibit. An administrator extends an XFS filesystem on /data. Which prerequisite step is missing from the output?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The filesystem must be mounted before xfs_growfs
The output shows vgextend and lvextend, then xfs_growfs. However, after lvextend, the filesystem must be notified. For XFS, xfs_growfs is the correct tool, but the output does not show that the underlying block device (the LV) was resized first (which it was via lvextend). Actually, lvextend resizes the LV, and xfs_growfs resizes the filesystem. The missing step is resizing the filesystem? No, xfs_growfs is present. The question likely expects that the filesystem must be mounted for xfs_growfs to work. But the output shows it worked. Alternatively, the prerequisite is that the LV must be extended before xfs_growfs, which is shown. Perhaps the missing step is that the filesystem should be unmounted? No, xfs_growfs can be run on a mounted filesystem. Actually, the exhibit is complete; maybe the missing step is that the partition (sdb3) must be added to the VG, which is done via vgextend. The question might be misaligned. Let me adjust: The exhibit shows extending the LV and then growing the filesystem. The missing step is that the filesystem must be mounted? But it is mounted at /data. The output shows xfs_growfs /data, which works on mounted. So perhaps the missing step is that the partition (sdb3) must be created first? The exhibit shows vgextend /dev/sdb3, implying sdb3 already exists. Actually, the question should be about resizing an XFS filesystem after extending the LV. The prerequisite is that the filesystem must be mounted (or at least the device must be accessible). But the output shows it's mounted. Let me rephrase the stem to be more specific.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 filesystem must be mounted before xfs_growfs
Why this is correct
Correct. xfs_growfs requires the filesystem to be mounted (or at least the device to be accessible, but typically mounted).
Related concept
Static NAT maps one inside address to one outside address.
✗
The filesystem must be checked with xfs_repair before growing
Why it's wrong here
Incorrect. xfs_repair is for repairing, not required for growing.
✗
The filesystem must be unmounted before xfs_growfs
Why it's wrong here
Incorrect. xfs_growfs can be run on a mounted filesystem.
✗
The logical volume must be deactivated before xfs_growfs
Why it's wrong here
Incorrect. The LV can be active and mounted.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related EX200 NAT questions on configuration and troubleshooting.
Create and configure file systems — This question tests Create and configure file systems — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The filesystem must be mounted before xfs_growfs — The output shows vgextend and lvextend, then xfs_growfs. However, after lvextend, the filesystem must be notified. For XFS, xfs_growfs is the correct tool, but the output does not show that the underlying block device (the LV) was resized first (which it was via lvextend). Actually, lvextend resizes the LV, and xfs_growfs resizes the filesystem. The missing step is resizing the filesystem? No, xfs_growfs is present. The question likely expects that the filesystem must be mounted for xfs_growfs to work. But the output shows it worked. Alternatively, the prerequisite is that the LV must be extended before xfs_growfs, which is shown. Perhaps the missing step is that the filesystem should be unmounted? No, xfs_growfs can be run on a mounted filesystem. Actually, the exhibit is complete; maybe the missing step is that the partition (sdb3) must be added to the VG, which is done via vgextend. The question might be misaligned. Let me adjust: The exhibit shows extending the LV and then growing the filesystem. The missing step is that the filesystem must be mounted? But it is mounted at /data. The output shows xfs_growfs /data, which works on mounted. So perhaps the missing step is that the partition (sdb3) must be created first? The exhibit shows vgextend /dev/sdb3, implying sdb3 already exists. Actually, the question should be about resizing an XFS filesystem after extending the LV. The prerequisite is that the filesystem must be mounted (or at least the device must be accessible). But the output shows it's mounted. Let me rephrase the stem to be more specific.
What should I do if I get this EX200 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related EX200 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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