- A
Developers use kubectl exec to change environment variables in a running pod
Why wrong: Modifying a running pod changes its state and is contrary to immutability.
- B
When a container fails, the orchestrator terminates it and launches a new container from the same image
Immutable infrastructure treats containers as disposable; failures are handled by replacement, not repair.
- C
A configuration management tool runs periodically to ensure containers are up-to-date
Why wrong: This involves modifying containers in place, which is mutable.
- D
An operator logs into a running container and applies a security patch with apt-get update
Why wrong: Patching a running container modifies its state, violating immutability; the image should be rebuilt.
Question 134 of 997
Immutable Infrastructure in Kubernetes — Replace, Don't Modify | CKNA Explained
This KCNA practice question tests your understanding of container orchestration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 company wants to adopt immutable infrastructure for its containerized applications. Which practice BEST exemplifies immutability?
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
✓
When a container fails, the orchestrator terminates it and launches a new container from the same image
Option B is correct because immutable infrastructure means that once a container is deployed from a specific image, it is never modified in place. When a container fails, the orchestrator (e.g., Kubernetes) terminates it and launches a new container from the same image, ensuring consistency and reproducibility. This approach eliminates configuration drift and aligns with the principle that all changes should be made by rebuilding the image, not by altering running instances.
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.
- ✗
Developers use kubectl exec to change environment variables in a running pod
Why it's wrong here
Modifying a running pod changes its state and is contrary to immutability.
- ✓
When a container fails, the orchestrator terminates it and launches a new container from the same image
Why this is correct
Immutable infrastructure treats containers as disposable; failures are handled by replacement, not repair.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A configuration management tool runs periodically to ensure containers are up-to-date
Why it's wrong here
This involves modifying containers in place, which is mutable.
- ✗
An operator logs into a running container and applies a security patch with apt-get update
Why it's wrong here
Patching a running container modifies its state, violating immutability; the image should be rebuilt.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse immutability with automation, thinking that any automated update (like a config management tool) is acceptable, when in fact immutability in Kubernetes requires that no changes are made to running containers — only new images are deployed via rolling updates or similar mechanisms.
Detailed technical explanation
How to think about this question
Under the hood, immutable infrastructure relies on container images being read-only layers; any runtime changes are ephemeral and lost on container restart. In Kubernetes, this is enforced by the Pod lifecycle — when a container exits, the kubelet pulls the same image to create a fresh container, ensuring the environment matches the image exactly. A real-world scenario where this matters is in security compliance: if a vulnerability is patched via apt-get inside a running container, the fix is not captured in the image, so any new replicas will still be vulnerable until the image is rebuilt and redeployed.
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.
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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: When a container fails, the orchestrator terminates it and launches a new container from the same image — Option B is correct because immutable infrastructure means that once a container is deployed from a specific image, it is never modified in place. When a container fails, the orchestrator (e.g., Kubernetes) terminates it and launches a new container from the same image, ensuring consistency and reproducibility. This approach eliminates configuration drift and aligns with the principle that all changes should be made by rebuilding the image, not by altering running instances.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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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