Google ACE Deploying and implementing a cloud solution Practice Question
This ACE practice question tests your understanding of deploying and implementing a cloud solution. 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 company wants to deploy a new version of their application with zero downtime. They are using a managed instance group (MIG) behind a load balancer. Which deployment method should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Perform a rolling update using a new instance template, with a health check
Option D is correct because a rolling update using a new instance template allows the managed instance group (MIG) to gradually replace instances with the new version while health checks ensure each new instance is healthy before proceeding. This maintains the desired capacity and avoids downtime, as the load balancer automatically directs traffic only to healthy instances throughout the process.
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.
✗
Create a new MIG, then update the load balancer's backend service
Why it's wrong here
This is a blue/green deployment, which is more work but also valid; however, rolling update is simpler and standard.
✗
Delete the current MIG and create a new one with the updated template
Why it's wrong here
This causes downtime.
✗
Update the instance template and restart all instances
Why it's wrong here
Restarting all instances simultaneously causes downtime.
✓
Perform a rolling update using a new instance template, with a health check
Why this is correct
Rolling updates replace instances gradually, and health checks ensure availability.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that updating the instance template and restarting all instances (Option C) is acceptable for zero downtime, but this ignores the fact that simultaneous restarts cause a full outage unless the MIG is configured for a rolling update with health checks.
Detailed technical explanation
How to think about this question
A rolling update in a MIG uses the `maxSurge` and `maxUnavailable` settings to control how many instances are created or removed at a time, ensuring the target capacity is maintained. The health check (e.g., HTTP, TCP, or SSL) is integrated with the load balancer's backend service to automatically drain connections from unhealthy instances before replacement. In practice, this approach is critical for stateful applications where session affinity (sticky sessions) must be preserved during the update.
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.
TExam Day Tips
→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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this ACE question in full detail.
Deploying and implementing a cloud solution — This question tests Deploying and implementing a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Perform a rolling update using a new instance template, with a health check — Option D is correct because a rolling update using a new instance template allows the managed instance group (MIG) to gradually replace instances with the new version while health checks ensure each new instance is healthy before proceeding. This maintains the desired capacity and avoids downtime, as the load balancer automatically directs traffic only to healthy instances throughout the process.
What should I do if I get this ACE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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