- A
kubectl create -f manifest.yaml
Why wrong: Create is imperative and does not track updates as well as apply.
- B
kubectl patch -f manifest.yaml
Why wrong: Patch is for partial updates, not for applying a full manifest.
- C
kubectl replace -f manifest.yaml
Why wrong: Replace is imperative and requires the resource to exist.
- D
kubectl apply -f manifest.yaml
Apply is the recommended declarative approach.
Question 759 of 997
kubectl apply vs create: Understanding Declarative Management and the Three-Way Merge
This KCNA practice question tests your understanding of kubernetes fundamentals. 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 kubectl commands would you use to apply a manifest file and also save it for later updates?
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
✓
kubectl apply -f manifest.yaml
Option D is correct because `kubectl apply` uses a declarative approach: it creates the resource if it doesn't exist and updates it if it does, while also storing the last-applied configuration as an annotation (`kubectl.kubernetes.io/last-applied-configuration`). This allows future `apply` calls to perform a three-way merge diff (current live state, last-applied config, and new manifest) to intelligently update the resource, making it the standard for managing manifests that need ongoing updates.
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.
- ✗
kubectl create -f manifest.yaml
Why it's wrong here
Create is imperative and does not track updates as well as apply.
- ✗
kubectl patch -f manifest.yaml
Why it's wrong here
Patch is for partial updates, not for applying a full manifest.
- ✗
kubectl replace -f manifest.yaml
Why it's wrong here
Replace is imperative and requires the resource to exist.
- ✓
kubectl apply -f manifest.yaml
Why this is correct
Apply is the recommended declarative approach.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `kubectl create` (which works for initial creation but fails on re-apply) with `kubectl apply` (which is idempotent and designed for ongoing updates), or they mistakenly think `kubectl replace` is equivalent to `apply` when it actually performs a full replacement without merge logic.
Detailed technical explanation
How to think about this question
Under the hood, `kubectl apply` leverages a three-way strategic merge patch: it compares the current live object, the last-applied configuration (stored as a JSON annotation), and the new manifest to compute the exact patch needed, preserving fields not specified in the manifest (e.g., default values set by the API server). In real-world GitOps workflows (e.g., with ArgoCD or Flux), `kubectl apply` is the foundation for reconciling desired state from a Git repository, ensuring that manual edits or controller-driven changes do not cause unexpected overwrites.
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.
- →
Kubernetes Fundamentals — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this KCNA question test?
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kubectl apply -f manifest.yaml — Option D is correct because `kubectl apply` uses a declarative approach: it creates the resource if it doesn't exist and updates it if it does, while also storing the last-applied configuration as an annotation (`kubectl.kubernetes.io/last-applied-configuration`). This allows future `apply` calls to perform a three-way merge diff (current live state, last-applied config, and new manifest) to intelligently update the resource, making it the standard for managing manifests that need ongoing updates.
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 →
Same concept, more angles
2 more ways this is tested on KCNA
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which kubectl command is used to apply a manifest file to create or update resources?
medium- A.kubectl update -f manifest.yaml
- B.kubectl run -f manifest.yaml
- ✓ C.kubectl apply -f manifest.yaml
- D.kubectl create -f manifest.yaml
Why C: Option C is correct because `kubectl apply -f manifest.yaml` is the declarative management command that creates or updates resources by applying a configuration manifest. It uses a three-way merge algorithm to compute the changes needed to reconcile the desired state in the manifest with the current state in the cluster, making it suitable for both initial creation and subsequent updates.
Variation 2. What is the primary purpose of the `kubectl apply` command?
easy- ✓ A.To create or update resources from a manifest
- B.To view resource details
- C.To delete resources
- D.To execute commands inside a container
Why A: The `kubectl apply` command uses a declarative approach to manage Kubernetes resources. It sends a PATCH request to the API server, which compares the desired state in the provided manifest (YAML/JSON) with the current state of the resource in the cluster. If the resource does not exist, it creates it; if it does exist, it updates only the fields specified in the manifest, preserving any fields not mentioned.
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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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