KCNA Cloud Native Application Delivery Practice Question
This KCNA practice question tests your understanding of cloud native application delivery. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 Kubernetes cluster runs a critical application that must be updated with zero downtime. The team wants to gradually shift traffic from the old version to the new version over a period of time. Which deployment pattern is MOST appropriate?
Why wrong: Rolling update replaces pods incrementally but does not provide fine-grained traffic shifting; it is a simple phased replacement.
B
Recreate deployment
Why wrong: Recreate terminates all old pods before creating new ones, causing downtime.
C
Blue-green deployment
Why wrong: Blue-green deployment switches traffic all at once from the old to the new version after validation, but does not gradually shift traffic over a period.
D
Canary deployment
Canary deployment gradually shifts a percentage of traffic to the new version, allowing monitoring and controlled rollout.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Canary deployment
Canary deployment involves rolling out the new version to a small subset of users initially and gradually increasing traffic while monitoring for issues. This minimizes risk and provides control over the rollout.
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.
✗
Rolling update
Why it's wrong here
Rolling update replaces pods incrementally but does not provide fine-grained traffic shifting; it is a simple phased replacement.
✗
Recreate deployment
Why it's wrong here
Recreate terminates all old pods before creating new ones, causing downtime.
✗
Blue-green deployment
Why it's wrong here
Blue-green deployment switches traffic all at once from the old to the new version after validation, but does not gradually shift traffic over a period.
✓
Canary deployment
Why this is correct
Canary deployment gradually shifts a percentage of traffic to the new version, allowing monitoring and controlled rollout.
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 KCNA 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 KCNA NAT questions on configuration and troubleshooting.
Cloud Native Application Delivery — This question tests Cloud Native Application Delivery — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Canary deployment — Canary deployment involves rolling out the new version to a small subset of users initially and gradually increasing traffic while monitoring for issues. This minimizes risk and provides control over the rollout.
What should I do if I get this KCNA 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 KCNA 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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