This CKAD practice question tests your understanding of application deployment. 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.
A developer wants to perform a canary deployment where 10% of traffic goes to a new version (v2) of an application. They create two Deployments (app-v1 and app-v2) and a Service. The Service selector is configured to match labels: 'app: myapp, version: v1'. How can they route 10% of traffic to v2 with minimal changes?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Change the Service selector to 'app: myapp' (remove version label) and set v1 replicas to 9 and v2 replicas to 1.
By adding the label 'version: v1' to only a subset of v2 pods, the Service will include them. But the correct approach is to modify the Service selector to match both versions and then scale the Deployments accordingly. However, the simplest method is to adjust the replica counts: if v1 has 9 replicas and v2 has 1 replica, and the Service selects both, traffic will be distributed roughly 90/10.
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.
✗
Use kubectl rollout pause on the v2 Deployment.
Why it's wrong here
Pausing a rollout does not split traffic; it stops the update process.
✗
Set the v2 Deployment's spec.replicas to 10% of the total replicas and keep the Service selector unchanged.
Why it's wrong here
If the Service selector only matches version: v1, v2 pods are not included regardless of replica count.
✓
Change the Service selector to 'app: myapp' (remove version label) and set v1 replicas to 9 and v2 replicas to 1.
Why this is correct
Correct. This makes the Service select both versions, and the replica ratio achieves 10% traffic to v2.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add a NetworkPolicy to limit traffic to v2 pods to 10%.
Why it's wrong here
NetworkPolicy controls ingress/egress, not traffic splitting for Services.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 CKAD 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
Identify which CKAD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Application Deployment — This question tests Application Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Change the Service selector to 'app: myapp' (remove version label) and set v1 replicas to 9 and v2 replicas to 1. — By adding the label 'version: v1' to only a subset of v2 pods, the Service will include them. But the correct approach is to modify the Service selector to match both versions and then scale the Deployments accordingly. However, the simplest method is to adjust the replica counts: if v1 has 9 replicas and v2 has 1 replica, and the Service selects both, traffic will be distributed roughly 90/10.
What should I do if I get this CKAD question wrong?
Identify which CKAD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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