The answer is that the Auto Scaling group is using a cached version of the launch template and needs to be updated or have its instances replaced. This occurs because when an Auto Scaling launch template references an SSM parameter for the AMI ID, the group resolves that parameter once at the time of launch template creation or association, caching the resolved AMI value. Updating the SSM parameter alone does not invalidate this cache; the launch template itself must be versioned or the group must be explicitly refreshed to force re-resolution of the parameter. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your understanding of how Auto Scaling caches resolved launch template values, a common trap where candidates assume dynamic SSM parameter lookups happen on every instance launch. Remember that the launch template caches the AMI ID at creation time, not at instance launch time. A useful memory tip: “Cache the template, not the parameter”—the group holds the old AMI until you update the template version or replace all instances.
SOA-C02 Deployment, Provisioning, and Automation Practice Question
This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. 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 runs a critical application on a fleet of EC2 instances managed by an Auto Scaling group. The application is deployed using a custom AMI that is updated monthly. The SysOps administrator uses a launch template that references the latest AMI ID via an AWS Systems Manager parameter. During a recent deployment, the administrator updated the AMI ID in the parameter, but the new instances launched by the Auto Scaling group still use the old AMI. The administrator confirms that the launch template is configured to reference the parameter. The Auto Scaling group has a desired capacity of 5, and the administrator manually terminates one instance to trigger a replacement. The new instance also uses the old AMI. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Auto Scaling group is using a cached version of the launch template and needs to be updated or have its instances replaced.
Option B is correct because the Auto Scaling group caches the resolved AMI ID from the launch template at the time of creation or when the launch template is updated. If the launch template is not updated or the group is not refreshed, the group continues to use the cached value. Option A is incorrect because the Systems Manager parameter does not need special permissions for the launch template to reference it; the launch template resolution happens at the account level. Option C is incorrect because instance metadata does not affect which AMI is used for launch. Option D is incorrect because Amazon CloudWatch does not control AMI resolution.
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.
✗
The Amazon CloudWatch alarm that triggers scaling is not configured correctly.
Why it's wrong here
Why D is wrong
✗
The IAM role associated with the Auto Scaling group does not have permission to read the Systems Manager parameter.
Why it's wrong here
Why A is wrong
✓
The Auto Scaling group is using a cached version of the launch template and needs to be updated or have its instances replaced.
Why this is correct
Why B is correct
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The instance metadata service (IMDS) is disabled on the launch template.
Why it's wrong here
Why C is wrong
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 SOA-C02 NAT questions on configuration and troubleshooting.
Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The Auto Scaling group is using a cached version of the launch template and needs to be updated or have its instances replaced. — Option B is correct because the Auto Scaling group caches the resolved AMI ID from the launch template at the time of creation or when the launch template is updated. If the launch template is not updated or the group is not refreshed, the group continues to use the cached value. Option A is incorrect because the Systems Manager parameter does not need special permissions for the launch template to reference it; the launch template resolution happens at the account level. Option C is incorrect because instance metadata does not affect which AMI is used for launch. Option D is incorrect because Amazon CloudWatch does not control AMI resolution.
What should I do if I get this SOA-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 SOA-C02 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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