- A
Stop all instances in the Auto Scaling group, apply the update, and start them again.
Why wrong: Stopping instances suspends billing but does not trigger automatic replacement; you would need to manually start them.
- B
Detach all instances from the Auto Scaling group, apply the update, and reattach them.
Why wrong: Detaching instances requires manual reattachment and could cause downtime.
- C
Double the desired capacity of the Auto Scaling group, wait for new instances, then terminate old instances.
Why wrong: Doubling desired capacity temporarily increases costs and may not be necessary; also requires manual update of the launch configuration.
- D
Terminate instances one at a time, allowing the Auto Scaling group to launch new instances with the updated configuration.
Terminating instances one at a time allows the Auto Scaling group to launch new instances with updated configuration, maintaining capacity and minimizing downtime.
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 runs SAP on AWS. During a maintenance window, the SAP application team needs to apply a kernel update that requires a reboot of the SAP application servers. The environment uses an Auto Scaling group for the application tier. What is the BEST approach to minimize downtime?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Terminate instances one at a time, allowing the Auto Scaling group to launch new instances with the updated configuration.
Option C is correct because terminating instances one at a time allows the Auto Scaling group to launch new instances with updated configuration, maintaining capacity and minimizing downtime. Option A is wrong because stopping instances suspends billing but does not trigger automatic replacement. Option B is wrong because detaching instances requires manual reattachment. Option D is wrong because doubling desired capacity temporarily increases costs and may not be necessary.
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.
- ✗
Stop all instances in the Auto Scaling group, apply the update, and start them again.
Why it's wrong here
Stopping instances suspends billing but does not trigger automatic replacement; you would need to manually start them.
- ✗
Detach all instances from the Auto Scaling group, apply the update, and reattach them.
Why it's wrong here
Detaching instances requires manual reattachment and could cause downtime.
- ✗
Double the desired capacity of the Auto Scaling group, wait for new instances, then terminate old instances.
Why it's wrong here
Doubling desired capacity temporarily increases costs and may not be necessary; also requires manual update of the launch configuration.
- ✓
Terminate instances one at a time, allowing the Auto Scaling group to launch new instances with the updated configuration.
Why this is correct
Terminating instances one at a time allows the Auto Scaling group to launch new instances with updated configuration, maintaining capacity and minimizing downtime.
Clue confirmation
The clue words "best", "minimum / minimize" in the question point toward this answer.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
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 PAS-C01 NAT questions on configuration and troubleshooting.
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Operations and Maintenance — study guide chapter
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Operations and Maintenance practice questions
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Operations and Maintenance — This question tests Operations and Maintenance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Terminate instances one at a time, allowing the Auto Scaling group to launch new instances with the updated configuration. — Option C is correct because terminating instances one at a time allows the Auto Scaling group to launch new instances with updated configuration, maintaining capacity and minimizing downtime. Option A is wrong because stopping instances suspends billing but does not trigger automatic replacement. Option B is wrong because detaching instances requires manual reattachment. Option D is wrong because doubling desired capacity temporarily increases costs and may not be necessary.
What should I do if I get this PAS-C01 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 PAS-C01 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best", "minimum / minimize". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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