The correct answer is to create a new launch template with a patched AMI, then perform a rolling update that detaches and reattaches the existing EBS volumes. This approach works because it separates the compute lifecycle from the data lifecycle: by detaching the existing EBS volumes from the old instances and reattaching them to the new, patched instances, you preserve all application state and data while achieving minimal downtime through a rolling replacement. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of stateful workload management within Auto Scaling groups, a common trap being the assumption that you must terminate instances and lose data or use in-place patching that causes extended downtime. The key insight is that EBS volumes are independent network-attached storage, so you can move them between instances. Memory tip: think "patch the AMI, not the volume" — the volume holds your state, so you swap the compute around it.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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.
A company runs a stateful application on Amazon EC2 instances in an Auto Scaling group. The application stores data on an Amazon EBS volume attached to each instance. The company wants to implement a patching strategy that minimizes downtime and preserves data. What should a solutions architect do?
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 launch template with a patched AMI, then perform a rolling update that detaches and reattaches the existing EBS volumes.
Option D is correct because replacing instances with a new launch template and attaching the existing EBS volumes preserves data. Option A is wrong because it causes downtime. Option B is wrong because it does not preserve state. Option C is wrong because it does not preserve data.
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.
✗
Use a rolling update with a new Auto Scaling group and delete old instances.
Why it's wrong here
Rolling update replaces instances, losing data unless volumes are detached.
✓
Create a new launch template with a patched AMI, then perform a rolling update that detaches and reattaches the existing EBS volumes.
Why this is correct
This replaces instances while preserving data by reattaching volumes, minimizing downtime.
Related concept
Static NAT maps one inside address to one outside address.
✗
Terminate all instances and launch new ones with a patched AMI.
Why it's wrong here
This loses data on EBS volumes.
✗
Use Systems Manager Patch Manager to apply patches to running instances.
Why it's wrong here
Patching while running may require reboots causing 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 SAP-C02 NAT questions on configuration and troubleshooting.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — 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 launch template with a patched AMI, then perform a rolling update that detaches and reattaches the existing EBS volumes. — Option D is correct because replacing instances with a new launch template and attaching the existing EBS volumes preserves data. Option A is wrong because it causes downtime. Option B is wrong because it does not preserve state. Option C is wrong because it does not preserve data.
What should I do if I get this SAP-C02 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 SAP-C02 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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