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ACE Practice Question: A team deploys a new version of their application…
This ACE practice question tests your understanding of a team deploys a new version of their application…. 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 team deploys a new version of their application using a blue-green strategy on GKE. The 'green' deployment is running but still in testing. When ready, traffic should instantly switch from 'blue' to 'green' with rollback possible in seconds. How is the instant switch implemented?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Update the Service's label selector from 'version: blue' to 'version: green'
Changing the Service selector instantly redirects all new traffic to green Pods. Blue Pods continue running for instant rollback — simply change the selector back.
B
Distractor review
Use kubectl patch to update the Service's ClusterIP to point to the green Deployment
ClusterIP is assigned by Kubernetes and cannot be manually patched to point to a different Deployment — Services route via label selectors, not IPs.
C
Distractor review
Delete the blue Deployment and create the green Deployment as the replacement
Deleting the blue Deployment first creates downtime between deletion and creation. Blue-green keeps both running simultaneously.
D
Distractor review
Update the Deployment's container image tag — GKE automatically performs a blue-green rollout
Updating the container image triggers a RollingUpdate by default, not a blue-green switch. Blue-green requires separate Deployments with a Service selector switch.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
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Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
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Question 2
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Question 3
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Question 4
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Question 5
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Question 6
A startup creates its first Google Cloud project. Before deploying any paid resources, what must be linked to the project?
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FAQ
Questions learners often ask
What does this ACE question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Update the Service's label selector from 'version: blue' to 'version: green' — In a blue-green deployment on Kubernetes, two Deployments (blue and green) run simultaneously. The Service selects Pods using a label selector (e.g., `version: blue`). Switching traffic is done by updating the Service's selector to `version: green` — atomic and instant with rollback possible by switching back.
What should I do if I get this ACE 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 ACE NAT questions on configuration and troubleshooting.
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