Question 278 of 991

Application Deployment →hardMultiple ChoiceObjective-mapped

CKAD Application Deployment Practice Question

This CKAD practice question tests your understanding of application deployment. 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 canary deployment is being implemented using two Deployments (stable and canary) and a Service. The Service's label selector has two entries: 'app: myapp' and 'version: stable'. Initially, the canary Deployment's pods have label 'version: canary'. To route a small percentage of traffic to the canary, what should you do?

Question 1hardmultiple choice

Review the full routing breakdown →

A
Update the Service's selector to include both 'version: stable' and 'version: canary'
Why wrong: A label selector can only match pods that have all the specified labels. If you add 'version: canary' as an additional selector, it would require pods to have both 'stable' and 'canary' which is impossible unless a pod has both labels. This would not work.
B
Change the canary Deployment's pod template labels to also include 'version: stable' so that the Service selects them
By adding the label 'version: stable' to the canary pods, they will be selected by the Service. Since the canary has fewer replicas, it will receive a proportionally smaller amount of traffic.
C
Use a NetworkPolicy to allow traffic to the canary
Why wrong: NetworkPolicy controls pod-to-pod communication, not Service traffic routing.
D
Create a new Service that points to both Deployments
Why wrong: Creating a new Service would not affect the existing Service. The client would need to be aware of both Services.

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

✓

Change the canary Deployment's pod template labels to also include 'version: stable' so that the Service selects them

The Service currently selects only pods with 'version: stable'. To route some traffic to canary, you need the canary pods to also be selected by the Service. You can change the canary pods' 'version' label to 'stable' (or add an additional label), or modify the Service selector to include both versions. However, the simplest approach is to update the canary Deployment's pod template labels to include 'version: stable' so that both Deployments have the same label, but the canary has a smaller number of replicas. Alternatively, you can use a Service Mesh like Istio for fine-grained traffic splitting. But among the options, updating the canary pod labels to match the Service selector is a common technique.

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.

✗
Update the Service's selector to include both 'version: stable' and 'version: canary'
Why it's wrong here
A label selector can only match pods that have all the specified labels. If you add 'version: canary' as an additional selector, it would require pods to have both 'stable' and 'canary' which is impossible unless a pod has both labels. This would not work.
✓
Change the canary Deployment's pod template labels to also include 'version: stable' so that the Service selects them
Why this is correct
By adding the label 'version: stable' to the canary pods, they will be selected by the Service. Since the canary has fewer replicas, it will receive a proportionally smaller amount of traffic.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use a NetworkPolicy to allow traffic to the canary
Why it's wrong here
NetworkPolicy controls pod-to-pod communication, not Service traffic routing.
✗
Create a new Service that points to both Deployments
Why it's wrong here
Creating a new Service would not affect the existing Service. The client would need to be aware of both Services.

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.

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 CKAD NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this CKAD question test?

Application Deployment — This question tests Application Deployment — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Change the canary Deployment's pod template labels to also include 'version: stable' so that the Service selects them — The Service currently selects only pods with 'version: stable'. To route some traffic to canary, you need the canary pods to also be selected by the Service. You can change the canary pods' 'version' label to 'stable' (or add an additional label), or modify the Service selector to include both versions. However, the simplest approach is to update the canary Deployment's pod template labels to include 'version: stable' so that both Deployments have the same label, but the canary has a smaller number of replicas. Alternatively, you can use a Service Mesh like Istio for fine-grained traffic splitting. But among the options, updating the canary pod labels to match the Service selector is a common technique.

What should I do if I get this CKAD question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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