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 SAP system on AWS uses a custom AMI for its application servers. The operations team needs to update the AMI to include a new security patch. What is the MOST efficient way to update all existing instances without downtime?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a new AMI version, update the Auto Scaling group's launch template, and perform a rolling update.
Option B is correct because using a launch template with a new AMI version and rolling update via Auto Scaling group minimizes downtime. Option A is wrong because patching each instance individually is manual and error-prone. Option C is wrong because stopping instances causes downtime. Option D is wrong because creating new instances manually is inefficient.
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 a new AMI version, update the Auto Scaling group's launch template, and perform a rolling update.
Why this is correct
This approach updates the AMI and replaces instances with minimal downtime.
Related concept
Static NAT maps one inside address to one outside address.
✗
Stop all instances, apply the patch, create a new AMI, and start instances.
Why it's wrong here
Stopping instances causes downtime.
✗
Use AWS Systems Manager Patch Manager to apply the patch to all running instances.
Why it's wrong here
Patch Manager patches existing instances, but does not update the AMI for future instances.
✗
Create a new AMI, launch new instances manually, and terminate old ones.
Why it's wrong here
Manual process is inefficient and error-prone.
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: Create a new AMI version, update the Auto Scaling group's launch template, and perform a rolling update. — Option B is correct because using a launch template with a new AMI version and rolling update via Auto Scaling group minimizes downtime. Option A is wrong because patching each instance individually is manual and error-prone. Option C is wrong because stopping instances causes downtime. Option D is wrong because creating new instances manually is inefficient.
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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