This CKA practice question tests your understanding of cluster architecture, installation and 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.
You need to back up etcd data for a cluster running Kubernetes v1.29. Which command correctly creates a snapshot?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
kubectl etcd snapshot save /backup/snapshot.db
Why wrong: kubectl does not have an etcd command.
etcdctl backup /backup/snapshot.db
Why wrong: 'backup' is not a valid etcdctl command.
ETCDCTL_API=2 etcdctl snapshot save /backup/snapshot.db
Why wrong: API v2 is deprecated and may not support snapshot.
ETCDCTL_API=3 etcdctl snapshot save /backup/snapshot.db
Correct API version and command.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ETCDCTL_API=3 etcdctl snapshot save /backup/snapshot.db
Option D is correct because etcd v3 is the default and supported version in Kubernetes v1.29, and the `ETCDCTL_API=3` environment variable ensures the etcdctl client uses the v3 API, which provides the `snapshot save` command for creating consistent backups. The command `ETCDCTL_API=3 etcdctl snapshot save /backup/snapshot.db` correctly captures a point-in-time snapshot of the etcd data store, which is essential for disaster recovery.
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.
kubectl etcd snapshot save /backup/snapshot.db
Why it's wrong here
kubectl does not have an etcd command.
etcdctl backup /backup/snapshot.db
Why it's wrong here
'backup' is not a valid etcdctl command.
ETCDCTL_API=2 etcdctl snapshot save /backup/snapshot.db
Why it's wrong here
API v2 is deprecated and may not support snapshot.
ETCDCTL_API=3 etcdctl snapshot save /backup/snapshot.db
Why this is correct
Correct API version and command.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse the deprecated etcd v2 API (which uses `etcdctl backup`) with the v3 API (which uses `etcdctl snapshot save`), and they may forget to set `ETCDCTL_API=3` or incorrectly assume `kubectl` can manage etcd snapshots.
Trap categories for this question
Command / output trap
kubectl does not have an etcd command.
Detailed technical explanation
The `ETCDCTL_API=3` environment variable is critical because etcdctl defaults to the v2 API in some older installations, and without it, the `snapshot save` command would fail with an unrecognized command error. The snapshot is a consistent, point-in-time copy of the entire etcd key-value store, including all cluster state, and is typically taken while the etcd leader is active to ensure data integrity. In production, you should also use the `--endpoints` and `--cacert`, `--cert`, `--key` flags to authenticate to the etcd cluster when running the command remotely.
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 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.
What to study next
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FAQ
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: ETCDCTL_API=3 etcdctl snapshot save /backup/snapshot.db — Option D is correct because etcd v3 is the default and supported version in Kubernetes v1.29, and the `ETCDCTL_API=3` environment variable ensures the etcdctl client uses the v3 API, which provides the `snapshot save` command for creating consistent backups. The command `ETCDCTL_API=3 etcdctl snapshot save /backup/snapshot.db` correctly captures a point-in-time snapshot of the etcd data store, which is essential for disaster recovery.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This CKA practice question is part of Courseiva's free CNCF 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 CKA exam.
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