This LFCS practice question tests your understanding of storage management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 system administrator needs to increase the size of an existing filesystem mounted at /var/www. The filesystem resides on a logical volume /dev/vg_web/lv_web. The volume group has free space. The administrator runs: lvextend -L +5G /dev/vg_web/lv_web, and then resize2fs /dev/vg_web/lv_web. The commands complete without error, but df shows the filesystem size did not change. What is the most likely reason?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The filesystem is not ext4; it is XFS, which requires xfs_growfs.
Option B is correct because if the filesystem is XFS (common for /var/www), resize2fs will not work; xfs_growfs must be used. Option A is false; resize2fs can take the device path. Option C is unnecessary; lvextend does not require pvresize. Option D would have produced an error if lvextend failed.
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 resize2fs command was run without the device path; it requires the mount point.
Why it's wrong here
resize2fs accepts either device path or mount point.
✗
The volume group does not have enough free extents; the lvextend failed silently.
Why it's wrong here
lvextend would report an error if no free space.
✓
The filesystem is not ext4; it is XFS, which requires xfs_growfs.
Why this is correct
Correct: XFS uses xfs_growfs, not resize2fs.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The logical volume was not properly extended; need to use pvresize.
Why it's wrong here
pvresize is needed on the PV only if the underlying disk changed; not here.
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 LFCS NAT questions on configuration and troubleshooting.
Storage Management — This question tests Storage Management — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The filesystem is not ext4; it is XFS, which requires xfs_growfs. — Option B is correct because if the filesystem is XFS (common for /var/www), resize2fs will not work; xfs_growfs must be used. Option A is false; resize2fs can take the device path. Option C is unnecessary; lvextend does not require pvresize. Option D would have produced an error if lvextend failed.
What should I do if I get this LFCS 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 LFCS NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.