The correct approach is to use AWS Systems Manager Patch Manager with a maintenance window and update the Auto Scaling group launch configuration to use a patched AMI for new instances. This works because Patch Manager applies security updates to running instances during a scheduled maintenance window, avoiding any termination or replacement that would cause downtime, while updating the launch configuration ensures any newly launched instances inherit the patched AMI for long-term consistency. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding of combining operational patching with infrastructure lifecycle management—a common trap is assuming you must recycle instances through a rolling update, which risks downtime if not carefully orchestrated. The key insight is that Patch Manager patches in-place on existing instances, and the launch configuration update handles future instances, creating a two-part strategy. Memory tip: “Patch live, launch fresh”—Patch Manager handles the live fleet, while the AMI update keeps new launches compliant.
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.
Solutions Architect needs to automate the patching of Amazon EC2 instances running Amazon Linux 2. The instances are in an Auto Scaling group and must be patched without downtime. Which approach is BEST?
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.
Use Amazon Inspector to scan for vulnerabilities and automatically apply patches.
Why wrong: Inspector only scans, it does not patch.
B
Terminate all instances and let the Auto Scaling group launch new instances from a patched AMI.
Why wrong: Causes downtime.
C
Use AWS Systems Manager Patch Manager with a maintenance window and update the Auto Scaling group launch configuration to use a patched AMI for new instances.
Patch Manager applies patches and rolling updates minimize downtime.
D
Create a custom AMI with latest patches and update the Auto Scaling group manually during a maintenance window.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS Systems Manager Patch Manager with a maintenance window and update the Auto Scaling group launch configuration to use a patched AMI for new instances.
Option C is correct because AWS Systems Manager Patch Manager automates patching of existing EC2 instances without downtime by using a maintenance window to schedule patch installation, and updating the Auto Scaling group launch configuration ensures new instances launched by the group use a patched AMI, maintaining consistency. This approach avoids terminating all instances at once (which would cause downtime) and leverages AWS-native automation for ongoing compliance.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use Amazon Inspector to scan for vulnerabilities and automatically apply patches.
Why it's wrong here
Inspector only scans, it does not patch.
✗
Terminate all instances and let the Auto Scaling group launch new instances from a patched AMI.
Why it's wrong here
Causes downtime.
✓
Use AWS Systems Manager Patch Manager with a maintenance window and update the Auto Scaling group launch configuration to use a patched AMI for new instances.
Why this is correct
Patch Manager applies patches and rolling updates minimize downtime.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a custom AMI with latest patches and update the Auto Scaling group manually during a maintenance window.
Why it's wrong here
Manual and not automated.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think Amazon Inspector can automatically patch instances (option A) because it integrates with Systems Manager, but Inspector only scans and reports vulnerabilities, not applying patches directly.
Detailed technical explanation
How to think about this question
AWS Systems Manager Patch Manager uses SSM Agent on EC2 instances to apply patches based on patch baselines (e.g., predefined rules for Amazon Linux 2), and maintenance windows define a schedule for execution, ensuring patches are applied during off-peak hours. The Auto Scaling group launch configuration or launch template must be updated to reference a patched AMI (e.g., using AWS Systems Manager Automation to create a new AMI after patching a reference instance), so new instances are patched from the start, while existing instances are patched in-place via Patch Manager without disruption.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Operations and Maintenance — This question tests Operations and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS Systems Manager Patch Manager with a maintenance window and update the Auto Scaling group launch configuration to use a patched AMI for new instances. — Option C is correct because AWS Systems Manager Patch Manager automates patching of existing EC2 instances without downtime by using a maintenance window to schedule patch installation, and updating the Auto Scaling group launch configuration ensures new instances launched by the group use a patched AMI, maintaining consistency. This approach avoids terminating all instances at once (which would cause downtime) and leverages AWS-native automation for ongoing compliance.
What should I do if I get this PAS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". 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?
Read the scenario before looking for a memorised answer.
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Question Discussion
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