The answer is to perform an instance refresh to gradually replace instances, which is the core of automating SAP patching with rolling update using AMI and Auto Scaling. This approach works because you first create a new, patched AMI, then update the launch configuration or template to reference it, and finally trigger an instance refresh so the Auto Scaling group replaces old instances with new ones in a controlled, staggered fashion—ensuring zero downtime for your SAP landscape. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of rolling update patterns versus blue/green deployments, with a common trap being the temptation to use AWS Systems Manager for in-place patching, which can introduce complexity and risk of downtime. Remember the memory tip: “AMI, launch, refresh—no downtime, no stress.”
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 and wants to automate the patching of SAP application servers. The servers are in an Auto Scaling group. Which THREE steps should be included in the automation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Update the Auto Scaling group's launch configuration or launch template to use the new AMI.
Options A, C, and E are correct because creating a new AMI, updating the launch configuration, and gradually replacing instances is a standard rolling update. Option B is wrong because SSM can be used but introduces complexity and potential downtime. Option D is wrong because terminating instances before new ones are ready causes downtime.
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.
✓
Update the Auto Scaling group's launch configuration or launch template to use the new AMI.
Why this is correct
This ensures new instances use the patched AMI.
Related concept
Static NAT maps one inside address to one outside address.
✓
Create a new AMI with the patches applied.
Why this is correct
A patched AMI ensures new instances are up-to-date.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use AWS Systems Manager to apply patches to running instances.
Why it's wrong here
This can cause downtime if instances reboot simultaneously.
✓
Perform an instance refresh to gradually replace instances.
Why this is correct
Instance refresh replaces instances in a rolling fashion, maintaining availability.
Related concept
Static NAT maps one inside address to one outside address.
✗
Terminate all existing instances at once.
Why it's wrong here
Terminating all instances causes complete 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: Update the Auto Scaling group's launch configuration or launch template to use the new AMI. — Options A, C, and E are correct because creating a new AMI, updating the launch configuration, and gradually replacing instances is a standard rolling update. Option B is wrong because SSM can be used but introduces complexity and potential downtime. Option D is wrong because terminating instances before new ones are ready causes downtime.
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.
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Question Discussion
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