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ACE Practice Question: A team needs to roll out a configuration change…
This ACE practice question tests your understanding of a team needs to roll out a configuration change…. 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 needs to roll out a configuration change to a MIG (Managed Instance Group) — updating the instance template to set a new environment variable. They want to validate the change on 1 VM before rolling it out to all 20 VMs. Which MIG update type supports this?
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
Distractor review
Snapshot the existing VMs and restore 1 with the new environment variable to test
Snapshotting and restoring VMs is not the MIG update mechanism. MIG's built-in canary update manages template versioning and partial rollout.
B
Distractor review
Recreate update — terminate all 20 VMs and recreate with the new template simultaneously
Recreate update terminates all instances at once — this causes complete outage, which is the opposite of a canary validation.
C
Distractor review
Opportunistic update — the new template applies only when VMs are naturally replaced
Opportunistic updates apply only when new VMs are created (autoscaling out) — they don't proactively update existing VMs on a schedule, which is needed for a canary test.
D
Best answer
Canary update — update 1 VM to the new template, verify, then roll out to all
MIG supports canary updates where a targetSize partition runs the new template while the rest run the old template. The team validates the canary VM before proceeding with full rollout.
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
Related ACE practice-question pages
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
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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: Canary update — update 1 VM to the new template, verify, then roll out to all — MIG Canary update (proactive update type with `maxSurge` and `maxUnavailable` set appropriately, combined with `targetSize` partition) allows updating a subset of instances first. The `--action=start` with `--version=template=[NEW],targetSize=1` (canary partition) updates only 1 instance while the rest remain on the old template.
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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