The answer is to create a new AMI with the patch, update the Auto Scaling group's launch template, and terminate instances one by one to trigger replacement. This is the most efficient way to remediate a vulnerability in an Auto Scaling group because it addresses both the running instances and the group's future scaling behavior; manually patching live instances is wasted effort since Auto Scaling will replace them with unpatched instances from the old AMI, while updating the launch template ensures all new instances are clean. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of immutable infrastructure and rolling updates—a common trap is choosing Systems Manager Patch Manager, which patches running instances but does not fix the launch template, leaving the group vulnerable on scale-out. Remember the memory tip: "Patch the source, not the symptom"—always update the AMI and launch template first, then cycle instances.
DOP-C02 Security and Compliance Practice Question
This DOP-C02 practice question tests your understanding of security and compliance. 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 uses Amazon Inspector to scan EC2 instances for vulnerabilities. The security team discovers that a critical vulnerability is present on an instance, but the instance is part of an Auto Scaling group. What is the MOST efficient way to remediate this vulnerability while ensuring the Auto Scaling group remains operational?
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 with the patch, update the Auto Scaling group's launch template, and terminate instances one by one to trigger replacement.
The most efficient way is to create a new Amazon Machine Image (AMI) with the vulnerability patched, update the Auto Scaling group's launch configuration/template to use the new AMI, and then perform a rolling update (e.g., by terminating instances one by one). Manually patching each instance is inefficient because Auto Scaling will launch new instances from the old AMI. Using AWS Systems Manager Patch Manager can patch on the fly but does not update the launch template for future instances. Isolating the instance does not fix the root cause.
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.
✗
Patch the instance manually via SSH, then create a new AMI from it and update the launch configuration.
Why it's wrong here
Manual patching is not efficient and prone to error.
✗
Detach the instance from the Auto Scaling group, patch it, and reattach it.
Why it's wrong here
Does not fix the launch configuration; future instances will still be vulnerable.
✗
Use AWS Systems Manager Patch Manager to patch the instance and then set the instance to not receive future updates.
Why it's wrong here
Does not update the launch template; new instances will still use old AMI.
✓
Create a new AMI with the patch, update the Auto Scaling group's launch template, and terminate instances one by one to trigger replacement.
Why this is correct
This ensures all new instances are patched with minimal disruption.
Related concept
Static NAT maps one inside address to one outside address.
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 DOP-C02 NAT questions on configuration and troubleshooting.
Security and Compliance — This question tests Security and Compliance — 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 with the patch, update the Auto Scaling group's launch template, and terminate instances one by one to trigger replacement. — The most efficient way is to create a new Amazon Machine Image (AMI) with the vulnerability patched, update the Auto Scaling group's launch configuration/template to use the new AMI, and then perform a rolling update (e.g., by terminating instances one by one). Manually patching each instance is inefficient because Auto Scaling will launch new instances from the old AMI. Using AWS Systems Manager Patch Manager can patch on the fly but does not update the launch template for future instances. Isolating the instance does not fix the root cause.
What should I do if I get this DOP-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 DOP-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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