- A
kubectl update deployment/nginx-deployment --image=nginx:1.21 --strategy=rolling
Why wrong: There is no 'kubectl update' command. The correct command is 'kubectl set image'.
- B
kubectl edit deployment/nginx-deployment --patch '{"spec":{"template":{"spec":{"containers":[{"name":"nginx","image":"nginx:1.21"}]}}}}'
Why wrong: While this works, it is not the simplest or most recommended command for a simple image update.
- C
kubectl rollout set image deployment/nginx-deployment nginx=nginx:1.21 --max-surge=2
Why wrong: The 'rollout' command does not have 'set image'; 'kubectl set image' is correct. Also, '--max-surge' is not a flag for this command.
- D
kubectl set image deployment/nginx-deployment nginx=nginx:1.21
This updates the container image. The default strategy is RollingUpdate with maxSurge=25%, which allows at least 2 extra pods for a desired count of 8 or more.
CKA Workloads and Scheduling Practice Question
This CKA practice question tests your understanding of workloads and scheduling. 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.
You need to update a Deployment's container image to 'nginx:1.21' and ensure the rollout performs a rolling update with 2 extra pods allowed above the desired count during the update. Which command should you use?
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 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 set image deployment/nginx-deployment nginx=nginx:1.21
Option C is correct. The 'kubectl set image' command updates the container image, and the '--record' flag is not needed in v1.29+ (but still works). The '--rollout' flag does not exist; 'kubectl rollout' is a separate command. To set maxSurge, you need to edit the Deployment or use 'kubectl patch'. However, the question asks for the command to update the image and ensure rolling update; the default strategy is RollingUpdate with default maxSurge=25%, which satisfies the requirement. Option A uses incorrect flags.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 update deployment/nginx-deployment --image=nginx:1.21 --strategy=rolling
Why it's wrong here
There is no 'kubectl update' command. The correct command is 'kubectl set image'.
- ✗
kubectl edit deployment/nginx-deployment --patch '{"spec":{"template":{"spec":{"containers":[{"name":"nginx","image":"nginx:1.21"}]}}}}'
Why it's wrong here
While this works, it is not the simplest or most recommended command for a simple image update.
- ✗
kubectl rollout set image deployment/nginx-deployment nginx=nginx:1.21 --max-surge=2
Why it's wrong here
The 'rollout' command does not have 'set image'; 'kubectl set image' is correct. Also, '--max-surge' is not a flag for this command.
- ✓
kubectl set image deployment/nginx-deployment nginx=nginx:1.21
Why this is correct
This updates the container image. The default strategy is RollingUpdate with maxSurge=25%, which allows at least 2 extra pods for a desired count of 8 or more.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
There is no 'kubectl update' command. The correct command is 'kubectl set image'.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CKA NAT questions on configuration and troubleshooting.
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Workloads and Scheduling — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this CKA question test?
Workloads and Scheduling — This question tests Workloads and Scheduling — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: kubectl set image deployment/nginx-deployment nginx=nginx:1.21 — Option C is correct. The 'kubectl set image' command updates the container image, and the '--record' flag is not needed in v1.29+ (but still works). The '--rollout' flag does not exist; 'kubectl rollout' is a separate command. To set maxSurge, you need to edit the Deployment or use 'kubectl patch'. However, the question asks for the command to update the image and ensure rolling update; the default strategy is RollingUpdate with default maxSurge=25%, which satisfies the requirement. Option A uses incorrect flags.
What should I do if I get this CKA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CKA NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
This CKA 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 CKA exam.
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