CKA Practice Question: Cluster Architecture, Installation and Configuration
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.
Which command correctly backs up etcd data using etcdctl with API version 3?
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.
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 A is correct because etcdctl requires the environment variable `ETCDCTL_API=3` to use the v3 API, which supports the `snapshot save` command for creating a consistent point-in-time backup of etcd data. The command `ETCDCTL_API=3 etcdctl snapshot save /backup/snapshot.db` correctly specifies the API version and the subcommand to save a snapshot to the given file path.
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.
✓
ETCDCTL_API=3 etcdctl snapshot save /backup/snapshot.db
Why this is correct
This is the correct command for etcd backup using API v3.
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.
✗
etcdctl backup /backup/snapshot.db
Why it's wrong here
'backup' is not a valid etcdctl subcommand for API v3.
'--snapshot' is not a valid flag; the correct subcommand is 'snapshot save'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the deprecated v2 API `etcdctl backup` command with the v3 API `snapshot save` command, or incorrectly assume a flag like `--snapshot` can replace the required subcommand structure.
Trap categories for this question
Command / output trap
'backup' is not a valid etcdctl subcommand for API v3.
Detailed technical explanation
How to think about this question
The `snapshot save` command uses the etcd v3 gRPC API to request a consistent snapshot from the etcd leader, which includes all key-value data, metadata, and the WAL (Write-Ahead Log) state. In a multi-node cluster, restoring from a snapshot requires using `etcdctl snapshot restore` with the `--initial-cluster` and `--initial-advertise-peer-urls` flags to reinitialize the member, as the snapshot does not preserve cluster membership. This is critical for disaster recovery scenarios where a corrupted etcd member must be replaced.
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 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.
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 and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ETCDCTL_API=3 etcdctl snapshot save /backup/snapshot.db — Option A is correct because etcdctl requires the environment variable `ETCDCTL_API=3` to use the v3 API, which supports the `snapshot save` command for creating a consistent point-in-time backup of etcd data. The command `ETCDCTL_API=3 etcdctl snapshot save /backup/snapshot.db` correctly specifies the API version and the subcommand to save a snapshot to the given file path.
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: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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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