The answer is to use AWS CloudFormation with a rolling update policy to gradually replace instances in the Auto Scaling group. This strategy is correct because it applies the critical OS security patch by terminating and launching instances one at a time, ensuring that the SAP application servers remain available throughout the patching process. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of maintaining high availability during patching SAP ASG with rolling update, often appearing as a distractor against options like stopping all instances or using Patch Manager alone. A common trap is assuming Patch Manager handles Auto Scaling groups gracefully, but it lacks the orchestrated instance replacement that CloudFormation’s UpdatePolicy provides. Remember the memory tip: “Rolling, not stopping” — a rolling update keeps SAP running, while stopping all instances causes downtime.
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An administrator needs to apply a critical OS security patch to multiple SAP application servers in an Auto Scaling group without disrupting ongoing operations. Which strategy should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS CloudFormation with a rolling update policy to gradually replace instances in the Auto Scaling group.
Option D (Use a rolling update via AWS CloudFormation with UpdatePolicy) is correct because it allows gradual replacement of instances. Option A (Stop all instances, apply patch, restart) causes downtime. Option B (Use AWS Systems Manager Patch Manager) is good but may not handle Auto Scaling gracefully. Option C (Create new AMI, update Auto Scaling group) is a blue/green approach but may be slower.
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, apply the patch using AWS Systems Manager, then restart all instances.
Why it's wrong here
This causes full downtime.
✓
Use AWS CloudFormation with a rolling update policy to gradually replace instances in the Auto Scaling group.
Why this is correct
Rolling update minimizes downtime by replacing instances one by one.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use AWS Systems Manager Patch Manager to patch instances at the next maintenance window.
Why it's wrong here
Patch Manager does not coordinate with Auto Scaling to avoid disruption.
✗
Create a new Amazon Machine Image (AMI) with the patch, update the Auto Scaling group's launch configuration, and terminate all instances.
Why it's wrong here
Terminating all instances causes downtime.
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 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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
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: Use AWS CloudFormation with a rolling update policy to gradually replace instances in the Auto Scaling group. — Option D (Use a rolling update via AWS CloudFormation with UpdatePolicy) is correct because it allows gradual replacement of instances. Option A (Stop all instances, apply patch, restart) causes downtime. Option B (Use AWS Systems Manager Patch Manager) is good but may not handle Auto Scaling gracefully. Option C (Create new AMI, update Auto Scaling group) is a blue/green approach but may be slower.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An SAP administrator needs to apply an OS security patch to all SAP application servers running on EC2 instances in an Auto Scaling group. The patch requires a reboot. What is the most efficient way to apply the patch with minimal downtime?
easy
A.SSH into each instance and apply the patch manually
B.Create a new AMI with the patch and update the Auto Scaling group
C.Use AWS CloudFormation to update the instances
✓ D.Use AWS Systems Manager Patch Manager with a maintenance window
Why D: Option D is correct because AWS Systems Manager Patch Manager can orchestrate patching across instances, and using a maintenance window with a reboot strategy minimizes downtime. Option A is wrong because manual patching is not efficient. Option B is wrong because CloudFormation is for infrastructure provisioning, not patching. Option C is wrong because replacing instances with new AMIs requires more effort.
Last reviewed: Jun 20, 2026
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This PAS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PAS-C01 exam.
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