CKA Practice Question: Cluster Architecture, Installation & Configuration
This CKA practice question tests your understanding of cluster architecture, installation & configuration. 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 DevOps engineer is designing a Kubernetes cluster for a production environment. Which of the following is a best practice for etcd deployment?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy etcd on dedicated nodes with SSD storage.
Option C is correct because etcd is the Kubernetes cluster's primary data store, and its performance directly impacts the entire cluster's stability and responsiveness. Dedicated nodes prevent resource contention from other workloads, while SSD storage provides the low-latency, high-IOPS performance required for etcd's frequent write operations (especially with the default 1 MB write-ahead log). This isolation is a recommended best practice in the official Kubernetes documentation for production clusters.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Deploy etcd on exactly 2 nodes for simplicity.
Why it's wrong here
2 nodes can cause split-brain; odd number is recommended.
✗
Deploy etcd on all worker nodes to maximize redundancy.
Why it's wrong here
Co-locating etcd with workers can cause resource contention and is not recommended.
✓
Deploy etcd on dedicated nodes with SSD storage.
Why this is correct
Dedicated nodes with fast storage are recommended for etcd performance and stability.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deploy etcd on the same nodes as GPU-accelerated workloads.
Why it's wrong here
GPU workloads are not related to etcd; separation is better.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume 'more nodes = more redundancy' (Option B) or that 'simplicity is better' (Option A), without understanding that etcd's Raft consensus requires an odd number of members and that dedicated, fast storage is non-negotiable for production reliability.
Detailed technical explanation
How to think about this question
Under the hood, etcd uses the Raft consensus protocol, which requires a majority of nodes to be healthy for writes to succeed; with 3 nodes, one failure is tolerated, but with 2 nodes, any single failure breaks quorum. etcd's performance is heavily dependent on disk fsync latency—SSDs with a high IOPS rating (e.g., 10,000+ random write IOPS) are critical because every write to etcd triggers an fsync to the write-ahead log, and even microsecond delays can cascade into cluster-wide timeouts. In real-world scenarios, a shared disk subsystem with noisy neighbors (e.g., GPU workloads doing frequent checkpointing) can cause etcd to miss its heartbeat intervals, leading to leader elections and temporary cluster unavailability.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CKA 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKA question in full detail.
Cluster Architecture, Installation & Configuration — This question tests Cluster Architecture, Installation & Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy etcd on dedicated nodes with SSD storage. — Option C is correct because etcd is the Kubernetes cluster's primary data store, and its performance directly impacts the entire cluster's stability and responsiveness. Dedicated nodes prevent resource contention from other workloads, while SSD storage provides the low-latency, high-IOPS performance required for etcd's frequent write operations (especially with the default 1 MB write-ahead log). This isolation is a recommended best practice in the official Kubernetes documentation for production clusters.
What should I do if I get this CKA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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