- A
Servers that are updated in-place with configuration management tools
Why wrong: In-place updates are the opposite of immutable infrastructure.
- B
Infrastructure that is version-controlled and deployed using blue/green deployments
Why wrong: This is a related practice but not the core definition.
- C
Infrastructure components that are replaced rather than changed after deployment
Immutable infrastructure replaces components instead of modifying them.
- D
Infrastructure that uses only read-only file systems
Why wrong: Read-only file systems are a security measure but not the definition of immutable infrastructure.
Question 735 of 997
What is Immutable Infrastructure?
This KCNA practice question tests your understanding of container orchestration. 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 of the following best describes immutable infrastructure?
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 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
✓
Infrastructure components that are replaced rather than changed after deployment
Immutable infrastructure is a pattern where components (servers, containers, etc.) are never modified after deployment. Instead, any change requires building a new instance from a golden image or template and replacing the old one. This eliminates configuration drift and ensures consistency, which is a core principle in container orchestration with tools like Kubernetes, where Pods are replaced rather than patched in place.
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.
- ✗
Servers that are updated in-place with configuration management tools
Why it's wrong here
In-place updates are the opposite of immutable infrastructure.
- ✗
Infrastructure that is version-controlled and deployed using blue/green deployments
Why it's wrong here
This is a related practice but not the core definition.
- ✓
Infrastructure components that are replaced rather than changed after deployment
Why this is correct
Immutable infrastructure replaces components instead of modifying them.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Infrastructure that uses only read-only file systems
Why it's wrong here
Read-only file systems are a security measure but not the definition of immutable infrastructure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse immutable infrastructure with specific deployment patterns (blue/green) or security features (read-only filesystems), rather than recognizing the core principle of replacement over modification.
Detailed technical explanation
How to think about this question
Under the hood, immutable infrastructure relies on creating a new instance from a pre-baked image (e.g., an AMI or container image) and terminating the old one. In Kubernetes, this is enforced by the ReplicaSet controller, which replaces Pods with new ones when the Pod template changes, rather than exec-ing into running containers to apply patches. A real-world scenario where this matters is during a security vulnerability patch: instead of SSH-ing into 100 servers to run `yum update`, you rebuild the image with the fix and roll it out via a rolling update, ensuring every instance is identical and free of drift.
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 KCNA 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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Container Orchestration — study guide chapter
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FAQ
Questions learners often ask
What does this KCNA question test?
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Infrastructure components that are replaced rather than changed after deployment — Immutable infrastructure is a pattern where components (servers, containers, etc.) are never modified after deployment. Instead, any change requires building a new instance from a golden image or template and replacing the old one. This eliminates configuration drift and ensures consistency, which is a core principle in container orchestration with tools like Kubernetes, where Pods are replaced rather than patched in place.
What should I do if I get this KCNA 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.
About these practice questions
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Last reviewed: Jul 4, 2026
This KCNA 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 KCNA exam.
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