- A
Leave the ASG attached to the previous Launch Template version so scale-out is stable.
Why wrong: Keeping an older Launch Template version prevents new instances from receiving updates. ASG scale-out should reflect the latest desired configuration. Stability is better handled by controlled version updates.
- B
Set the ASG to use the latest Launch Template version and optionally start an instance refresh for existing instances.
ASG scale-out uses the configured Launch Template version at instance launch time. Switching the ASG to the latest version ensures new instances are consistent. An instance refresh helps apply changes to running instances safely and predictably.
- C
Manually SSH into each new instance and reconfigure it after it launches.
Why wrong: Manual configuration does not scale and introduces drift between instances. It also delays readiness and can cause inconsistent behavior during rapid scaling. Launch Templates are intended to automate instance configuration.
- D
Move the configuration changes into a security group rule so the ASG updates them automatically.
Why wrong: Security groups control network access, not application configuration or runtime parameters. Putting configuration into security group rules is not an appropriate mechanism. ASG instance configuration is managed via Launch Template data.
SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. 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. A key principle to apply: aSGs launch new instances using their currently configured Launch Template version.. 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 web service runs on an Auto Scaling group (ASG). The team updates configuration (AMIs, environment variables) in a Launch Template and wants new instances created during scale-out to use the latest Launch Template version. What should the architect do?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Set the ASG to use the latest Launch Template version and optionally start an instance refresh for existing instances.
Option B is correct because the Auto Scaling group can be configured to use the latest version of a launch template by specifying the `$Latest` version. This ensures that any new instances launched during scale-out automatically use the most recent configuration. Additionally, an instance refresh can be initiated to update existing instances to the latest template version without manual intervention.
Key principle: ASGs launch new instances using their currently configured Launch Template version.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Leave the ASG attached to the previous Launch Template version so scale-out is stable.
Why it's wrong here
Keeping an older Launch Template version prevents new instances from receiving updates. ASG scale-out should reflect the latest desired configuration. Stability is better handled by controlled version updates.
- ✓
Set the ASG to use the latest Launch Template version and optionally start an instance refresh for existing instances.
Why this is correct
ASG scale-out uses the configured Launch Template version at instance launch time. Switching the ASG to the latest version ensures new instances are consistent. An instance refresh helps apply changes to running instances safely and predictably.
Related concept
ASGs launch new instances using their currently configured Launch Template version.
- ✗
Manually SSH into each new instance and reconfigure it after it launches.
Why it's wrong here
Manual configuration does not scale and introduces drift between instances. It also delays readiness and can cause inconsistent behavior during rapid scaling. Launch Templates are intended to automate instance configuration.
- ✗
Move the configuration changes into a security group rule so the ASG updates them automatically.
Why it's wrong here
Security groups control network access, not application configuration or runtime parameters. Putting configuration into security group rules is not an appropriate mechanism. ASG instance configuration is managed via Launch Template data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think the ASG automatically updates existing instances when the launch template is updated, but in reality, only new instances launched after the update use the new version unless an instance refresh is explicitly triggered.
Detailed technical explanation
How to think about this question
Under the hood, an Auto Scaling group references a launch template by its ID and version number (e.g., `1`, `$Default`, or `$Latest`). When set to `$Latest`, the ASG automatically uses the most recent version of the template for any new instance launches. An instance refresh works by terminating existing instances in a controlled manner (respecting health check grace periods and cooldowns) and replacing them with instances using the latest template version, which is useful for rolling out updates without downtime.
KKey Concepts to Remember
- ASGs launch new instances using their currently configured Launch Template version.
- Updating an ASG to a new Launch Template version ensures future scale-out instances use it.
- Instance refresh replaces existing instances with new ones from the updated Launch Template.
- Launch Templates define instance configuration, including AMI, instance type, and user data.
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
ASGs launch new instances using their currently configured Launch Template version.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Review aSGs launch new instances using their currently configured Launch Template version., then practise related SAA-C03 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design High-Performing Architectures — This question tests Design High-Performing Architectures — ASGs launch new instances using their currently configured Launch Template version..
What is the correct answer to this question?
The correct answer is: Set the ASG to use the latest Launch Template version and optionally start an instance refresh for existing instances. — Option B is correct because the Auto Scaling group can be configured to use the latest version of a launch template by specifying the `$Latest` version. This ensures that any new instances launched during scale-out automatically use the most recent configuration. Additionally, an instance refresh can be initiated to update existing instances to the latest template version without manual intervention.
What should I do if I get this SAA-C03 question wrong?
Review aSGs launch new instances using their currently configured Launch Template version., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
ASGs launch new instances using their currently configured Launch Template version.
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Last reviewed: Jun 11, 2026
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