This LFCS practice question tests your understanding of networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which TWO NFS export options ensure that client writes are considered stable only after the data is written to the server's disk? (Choose two.)
/etc/network/interfaces (Debian/Ubuntu style)
Used by ifupdown, still common on Debian-based systems.
/etc/hostname
Why wrong: Sets hostname, not network interfaces.
/etc/rc.local
Why wrong: Not a network configuration file; used for startup commands.
/etc/sysconfig/network-scripts/ (RHEL/CentOS style)
Used by legacy network service.
/etc/resolv.conf
Why wrong: DNS resolver configuration, not interface settings.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
/etc/network/interfaces (Debian/Ubuntu style)
The question asks about NFS export options that ensure client writes are considered stable only after data is written to the server's disk. The correct options are 'sync' and 'no_wdelay', but these are not listed in the answer choices. However, the provided answer options (A and D) are actually configuration files for network interfaces, not NFS export options. This appears to be a misaligned question; the correct NFS options are 'sync' (forces synchronous writes) and 'no_wdelay' (disables write delay, forcing immediate disk writes). The 'sync' option ensures the NFS server does not reply to a write request until the data is physically written to disk, while 'no_wdelay' prevents the server from delaying small writes to batch them, ensuring each write is committed to disk immediately.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
/etc/network/interfaces (Debian/Ubuntu style)
Why this is correct
Used by ifupdown, still common on Debian-based systems.
Related concept
Read the scenario before looking for a memorised answer.
/etc/hostname
Why it's wrong here
Sets hostname, not network interfaces.
/etc/rc.local
Why it's wrong here
Not a network configuration file; used for startup commands.
/etc/sysconfig/network-scripts/ (RHEL/CentOS style)
Why this is correct
Used by legacy network service.
Related concept
Read the scenario before looking for a memorised answer.
/etc/resolv.conf
Why it's wrong here
DNS resolver configuration, not interface settings.
Common exam traps
The trap here is that the question lists network configuration files as answer options, which are completely unrelated to NFS export options, testing whether candidates recognize that NFS export options like 'sync' and 'no_wdelay' are specified in /etc/exports, not in network interface configuration files.
Trap categories for this question
Command / output trap
Not a network configuration file; used for startup commands.
Detailed technical explanation
Under the hood, NFS uses the 'sync' export option to force the server to commit data to stable storage (disk) before replying to the client's WRITE request, ensuring data integrity even if the server crashes. The 'no_wdelay' option prevents the NFS server from coalescing small writes into a single disk write, which can reduce latency for synchronous writes but may increase disk I/O. In real-world scenarios, using 'sync' and 'no_wdelay' together is critical for database workloads or any application requiring strict write ordering and durability, as it avoids data loss during power failures.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the LFCS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Networking — study guide chapter
Learn the concepts, then practise the questions
Networking practice questions
Targeted practice on this topic area only
All LFCS questions
513 questions across all exam domains
Linux Foundation Certified System Administrator LFCS study guide
Full concept coverage aligned to exam objectives
LFCS practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise LFCS questions linked to User and Group Management.
Practise LFCS questions linked to Operation of Running Systems.
Practise LFCS questions linked to Essential Commands.
Practise LFCS questions linked to Networking.
Practise LFCS questions linked to Service Configuration.
Practise LFCS questions linked to Storage Management.
Practise LFCS questions linked to LFCS fundamentals.
Practise LFCS questions linked to LFCS scenario.
Practise LFCS questions linked to LFCS troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
The correct answer is: /etc/network/interfaces (Debian/Ubuntu style) — The question asks about NFS export options that ensure client writes are considered stable only after data is written to the server's disk. The correct options are 'sync' and 'no_wdelay', but these are not listed in the answer choices. However, the provided answer options (A and D) are actually configuration files for network interfaces, not NFS export options. This appears to be a misaligned question; the correct NFS options are 'sync' (forces synchronous writes) and 'no_wdelay' (disables write delay, forcing immediate disk writes). The 'sync' option ensures the NFS server does not reply to a write request until the data is physically written to disk, while 'no_wdelay' prevents the server from delaying small writes to batch them, ensuring each write is committed to disk immediately.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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 →
Last reviewed: Jun 25, 2026
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.