The correct command is kubectl apply -f api-deployment.yaml. This is because kubectl apply uses a declarative management approach, meaning it reads the desired state from the YAML manifest and instructs the Kubernetes API to reconcile the current cluster state with that definition—creating the Deployment if it doesn't exist, or performing a rolling update if it does. In contrast, kubectl create is imperative and will fail if the resource already exists, making it unsuitable for updates. On the Google Associate Cloud Engineer exam, this distinction tests your understanding of Kubernetes resource management and the declarative vs. imperative paradigm, often appearing in scenario-based questions where you must choose the command that handles both creation and updates safely. A common trap is confusing create with apply when a manifest already exists; remember that apply is idempotent and merge-friendly, while create is not. Memory tip: think of apply as “apply the desired state, no matter what’s already there,” and create as “create from scratch, only once.”
Google ACE Deploying and implementing a cloud solution Practice Question
This ACE practice question tests your understanding of deploying and implementing a cloud solution. 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.
A developer has a Kubernetes Deployment manifest in a file named 'api-deployment.yaml'. Which command creates the Deployment if it doesn't exist, or updates it if it does?
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
✓
kubectl apply -f api-deployment.yaml
Option C is correct because `kubectl apply -f api-deployment.yaml` uses a declarative approach: it creates the Deployment if it does not exist, or performs a rolling update if it already exists, by applying the desired state defined in the YAML manifest. This command leverages the Kubernetes API's server-side apply logic, merging changes without requiring the resource to be deleted first.
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 api-deployment.yaml
Why it's wrong here
`kubectl create -f` fails with an error if the resource already exists — it is not idempotent like `apply`.
✗
kubectl run api-deployment.yaml
Why it's wrong here
`kubectl run` creates a Pod directly from an image name — it does not apply a YAML manifest file.
✓
kubectl apply -f api-deployment.yaml
Why this is correct
`kubectl apply -f` reads the manifest and creates or updates the resource declaratively — the standard command for deploying from YAML files.
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.
✗
kubectl deploy -f api-deployment.yaml
Why it's wrong here
`kubectl deploy` is not a valid kubectl command. Use `kubectl apply` or `kubectl create`.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between `create` (imperative, fails on existing resources) and `apply` (declarative, idempotent), trapping candidates who think `create` can also update or who confuse `run` with `apply`.
Trap categories for this question
Command / output trap
`kubectl deploy` is not a valid kubectl command. Use `kubectl apply` or `kubectl create`.
Detailed technical explanation
How to think about this question
Under the hood, `kubectl apply` sends a PATCH request to the Kubernetes API server using the `application/apply-patch+yaml` content type, which triggers server-side apply (SSA) in recent versions. This mechanism tracks field ownership via `managedFields`, allowing multiple controllers to collaborate without overwriting each other's changes. A real-world scenario where this matters is in CI/CD pipelines: using `apply` ensures that only the desired state in the YAML is enforced, while preserving annotations or labels added by other tools like Helm or operators.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this ACE question in full detail.
Deploying and implementing a cloud solution — This question tests Deploying and implementing a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kubectl apply -f api-deployment.yaml — Option C is correct because `kubectl apply -f api-deployment.yaml` uses a declarative approach: it creates the Deployment if it does not exist, or performs a rolling update if it already exists, by applying the desired state defined in the YAML manifest. This command leverages the Kubernetes API's server-side apply logic, merging changes without requiring the resource to be deleted first.
What should I do if I get this ACE 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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