Question 865 of 997

Kubernetes Fundamentals →mediumMultiple ChoiceObjective-mapped

How to Create a Deployment with kubectl create deployment

This KCNA practice question tests your understanding of kubernetes fundamentals. 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 creates a Deployment named 'nginx-deployment' from the image 'nginx:1.25' and exposes it on port 80?

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.

A
kubectl create deployment nginx-deployment --image=nginx:1.25 --port=80
This creates a Deployment with the specified image and port exposure.
B
kubectl run nginx-deployment --image=nginx:1.25 --port=80
Why wrong: This creates a Pod, not a Deployment.
C
kubectl apply -f nginx-deployment.yaml
Why wrong: This applies a manifest, but no YAML file is given.
D
kubectl expose deployment nginx-deployment --type=ClusterIP
Why wrong: This exposes an existing deployment, but does not create it.

Full breakdown with real-world context →

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 create deployment nginx-deployment --image=nginx:1.25 --port=80

Option A is correct because the `kubectl create deployment` command is the standard way to create a Deployment resource in Kubernetes. The `--image=nginx:1.25` flag specifies the container image, and the `--port=80` flag sets the container port in the pod template spec, which allows the Deployment to expose the container on port 80.

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 deployment nginx-deployment --image=nginx:1.25 --port=80
Why this is correct
This creates a Deployment with the specified image and port exposure.
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 run nginx-deployment --image=nginx:1.25 --port=80
Why it's wrong here
This creates a Pod, not a Deployment.
✗
kubectl apply -f nginx-deployment.yaml
Why it's wrong here
This applies a manifest, but no YAML file is given.
✗
kubectl expose deployment nginx-deployment --type=ClusterIP
Why it's wrong here
This exposes an existing deployment, but does not create it.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse `kubectl run` with `kubectl create deployment`, as `kubectl run` can create a pod but not a Deployment in modern Kubernetes, and they may think the `--port` flag works with `kubectl run` when it does not.

Detailed technical explanation

How to think about this question

The `kubectl create deployment` command generates a Deployment resource with a ReplicaSet and pod template, setting the container port via the `--port` flag which populates the `containerPort` field in the pod spec. Under the hood, this triggers the Kubernetes controller manager to create a ReplicaSet and then pods, and the port is used for service discovery and network policies. In real-world scenarios, you would often combine this with `kubectl expose` to create a Service, but the question specifically asks for the command that creates the Deployment and exposes it on port 80, which is achieved by the `--port` flag in the create command.

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?

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 create deployment nginx-deployment --image=nginx:1.25 --port=80 — Option A is correct because the `kubectl create deployment` command is the standard way to create a Deployment resource in Kubernetes. The `--image=nginx:1.25` flag specifies the container image, and the `--port=80` flag sets the container port in the pod template spec, which allows the Deployment to expose the container on port 80.

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: "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.

About these practice questions

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Same concept, more angles

1 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 command creates a Deployment named 'nginx' from the 'nginx:1.19' image?

easy

A.kubectl run nginx --image=nginx:1.19
✓ B.kubectl create deployment nginx --image=nginx:1.19
C.kubectl start deployment nginx --image=nginx:1.19
D.kubectl apply -f nginx-deployment.yaml

Why B: Option B is correct because the `kubectl create deployment` command is the standard Kubernetes imperative method to create a Deployment resource, and specifying `--image=nginx:1.19` directly sets the container image for the pod template. This command generates a Deployment object that manages a ReplicaSet with the specified image, ensuring declarative updates and rollback capabilities.

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