The answer is an Auto Scaling group with a simple scaling policy based on a CloudWatch CPU alarm. This combination is correct because it directly ties the EC2 instance count to real-time CPU utilization metrics from the Application Load Balancer, enabling dynamic auto scaling that responds to actual load rather than scheduled or event-driven triggers. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of native scaling mechanisms versus managed services like Elastic Beanstalk or Lambda-based scheduling, which are not dynamic. A common trap is confusing a simple scaling policy with step or target tracking policies—simple scaling works well for steady-state CPU thresholds, but the exam expects you to recognize that any CloudWatch alarm-based policy on an Auto Scaling group provides the required dynamic response. Memory tip: “CPU + ALB = ASG with CloudWatch alarm” — if the question asks for services, always pick the Auto Scaling group itself, not a higher-level abstraction.
SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
This SAP-C02 practice question tests your understanding of accelerate workload migration and modernization. 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.
A company is migrating a web application to AWS and wants to automatically scale the application based on CPU utilization. The application runs on a set of EC2 instances behind an Application Load Balancer. Which combination of AWS services should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Auto Scaling group with a simple scaling policy based on CloudWatch CPU alarm
Option A (Auto Scaling group with a scaling policy based on CPU) is correct because it directly scales EC2 instances. Option B (Lambda scheduled scaling) is not dynamic. Option C (Elastic Beanstalk) is a PaaS, but the question asks for services: Auto Scaling group is the service. Option D (CloudFront) is a CDN.
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.
✗
AWS Lambda with scheduled scaling
Why it's wrong here
Lambda does not manage EC2 scaling; scheduled scaling is not dynamic.
✗
Amazon CloudFront with origin scaling
Why it's wrong here
CloudFront is a CDN, not for EC2 scaling.
✗
AWS Elastic Beanstalk with environment scaling
Why it's wrong here
Beanstalk uses Auto Scaling internally, but the direct service is Auto Scaling group.
✓
Auto Scaling group with a simple scaling policy based on CloudWatch CPU alarm
Why this is correct
Auto Scaling group can scale based on CPU utilization.
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
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 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.
Accelerate Workload Migration and Modernization — This question tests Accelerate Workload Migration and Modernization — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Auto Scaling group with a simple scaling policy based on CloudWatch CPU alarm — Option A (Auto Scaling group with a scaling policy based on CPU) is correct because it directly scales EC2 instances. Option B (Lambda scheduled scaling) is not dynamic. Option C (Elastic Beanstalk) is a PaaS, but the question asks for services: Auto Scaling group is the service. Option D (CloudFront) is a CDN.
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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