The answer is to use an Auto Scaling group with a launch template referencing a patched AMI and perform a rolling update. This approach is correct because it decouples the SAP application from the underlying OS by provisioning a new, patched EC2 instance from the updated AMI, then shifting traffic to it before terminating the old instance, thereby patching EC2 for SAP without downtime. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of stateless architecture patterns for critical SAP workloads, where the common trap is assuming in-place patching tools like Patch Manager or manual reboots are acceptable—they always cause SAP downtime. Remember the key principle: for zero-downtime OS patching, you never patch the running instance; you replace it. A useful memory tip is “Replace, don’t repair” to recall that rolling updates via Auto Scaling groups are the only way to avoid rebooting the SAP application.
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. 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.
An organization runs SAP ERP on a single EC2 instance with a separate RDS for Oracle database. The Operations team needs to patch the operating system of the EC2 instance without causing downtime for the SAP application. What is the most effective approach?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an Auto Scaling group with a launch template that references a patched AMI, and perform a rolling update.
Option D is correct because using an Auto Scaling group with a launch template that includes the updated AMI allows for rolling updates with minimal downtime. Option A is wrong because patching a running instance requires a reboot, causing downtime. Option B is wrong because Systems Manager Patch Manager also requires a reboot. Option C is wrong because Snapshots are for data backup, not OS patching.
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.
✗
Create an AMI of the instance, launch a new instance from the AMI, and patch it.
Why it's wrong here
This causes downtime during the switchover.
✓
Use an Auto Scaling group with a launch template that references a patched AMI, and perform a rolling update.
Why this is correct
Rolling updates replace instances gradually, minimizing downtime.
Related concept
Static NAT maps one inside address to one outside address.
✗
Apply patches using AWS Systems Manager Patch Manager during a maintenance window.
Why it's wrong here
Patching typically requires a reboot, causing downtime.
✗
Use AWS Systems Manager to run a script that patches the OS without rebooting.
Why it's wrong here
Most OS patches require a reboot to take effect.
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 an Auto Scaling group with a launch template that references a patched AMI, and perform a rolling update. — Option D is correct because using an Auto Scaling group with a launch template that includes the updated AMI allows for rolling updates with minimal downtime. Option A is wrong because patching a running instance requires a reboot, causing downtime. Option B is wrong because Systems Manager Patch Manager also requires a reboot. Option C is wrong because Snapshots are for data backup, not OS patching.
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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