LFCS /etc/network/interfaces Practice Question
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.)
⚠ Common exam trap
A common trap is choosing 'async' instead of 'sync'. The 'async' option allows the server to acknowledge writes before data is actually committed to disk, which can improve performance but risks data loss if the server crashes before the data is written.
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
✓
sync
The NFS export options 'sync' and 'no_wdelay' ensure that client writes are considered stable only after the data is written to the server's disk. The 'sync' option causes the server to write data to disk before acknowledging the write request to the client, while 'no_wdelay' disables write delays, ensuring writes are flushed immediately. Together, they provide the highest level of write stability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
sync
Why this is correct
Correct: The 'sync' option ensures that the server writes data to disk before responding to the client, making writes stable.
- ✗
async
Why it's wrong here
Incorrect: The 'async' option allows the server to respond before writing to disk, so writes are not stable at that point.
- ✓
no_wdelay
Why this is correct
Correct: The 'no_wdelay' option ensures that the server does not delay writes, causing immediate writes and stability.
- ✗
wdelay
Why it's wrong here
Incorrect: 'wdelay' allows the server to delay writes for efficiency, which can compromise write stability.
- ✗
nohide
Why it's wrong here
Incorrect: 'nohide' controls directory visibility and is unrelated to write stability.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.