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.
You need to perform a canary deployment where 10% of traffic goes to the new version. You have a Deployment 'app-v1' with 9 replicas and 'app-v2' with 1 replica. What must be true for the Service to distribute traffic roughly 90/10?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Service selector must include a label that both Deployments share, e.g., 'app: myapp'
The Service must select both versions using a common label that both Deployments share, such as 'app: myapp'. The replicas count difference will naturally route about 90% to v1 and 10% to v2. Option B is correct. Option A would only select v1. Option C is incorrect because the Service should select both. Option D would not help.
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.
✗
The Service must have 'sessionAffinity: ClientIP' to ensure sticky sessions
Why it's wrong here
Session affinity is not required for traffic distribution.
✗
The Service must not have any selectors, and endpoints must be manually managed
Why it's wrong here
Not necessary for canary.
✗
The Service selector must include only 'version: v2'
Why it's wrong here
Would only route to v2.
✓
The Service selector must include a label that both Deployments share, e.g., 'app: myapp'
Why this is correct
Both Deployments have the same app label, so the Service selects both sets of pods.
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.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
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.
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: The Service selector must include a label that both Deployments share, e.g., 'app: myapp' — The Service must select both versions using a common label that both Deployments share, such as 'app: myapp'. The replicas count difference will naturally route about 90% to v1 and 10% to v2. Option B is correct. Option A would only select v1. Option C is incorrect because the Service should select both. Option D would not help.
What should I do if I get this CKAD 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 CKAD NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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