The answer is to attach the Auto Scaling group directly to an ALB target group. This is the correct approach because when an Auto Scaling group is associated with a target group, any EC2 instance launched by the group is automatically registered with the Application Load Balancer, which in turn forwards traffic to the SAP Web Dispatcher. This leverages the native lifecycle hook of the Auto Scaling group to handle registration without additional scripting or external triggers. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding of how to integrate AWS-native scaling with SAP’s stateless application layer, often appearing as a trap where candidates overcomplicate the solution with Lambda or Systems Manager. The key insight is that the ALB target group acts as the bridge between the Auto Scaling group and the Web Dispatcher, making manual registration unnecessary. Memory tip: Think “ASG to ALB” as a direct handshake—no middlemen needed.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. 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.
An SAP system is deployed on AWS using an Auto Scaling group of EC2 instances for the SAP application server layer. The application servers are stateless. The company wants to ensure that when a new instance is launched, it automatically registers with the SAP Web Dispatcher. The Web Dispatcher is configured with an Application Load Balancer (ALB). What is the best way to achieve automatic registration?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attach the Auto Scaling group to an ALB target group.
Option C is correct: The Auto Scaling group can be attached to the ALB target group, so instances are automatically registered. Option A is wrong because user data can configure the instance but not register with Web Dispatcher directly. Option B is wrong because CloudWatch Events can trigger a Lambda, but this is more complex. Option D is wrong because Systems Manager State Manager can run scripts, but not as straightforward as attaching to ALB.
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 Amazon CloudWatch Events to trigger an AWS Lambda function that registers the instance.
Why it's wrong here
This adds complexity.
✗
Use AWS Systems Manager State Manager to run a registration script on the instance.
Why it's wrong here
State Manager can run scripts but not automatically on launch.
✗
Configure the EC2 instance's user data to run a script that registers with the Web Dispatcher.
Why it's wrong here
User data runs at launch but cannot register with ALB.
✓
Attach the Auto Scaling group to an ALB target group.
Why this is correct
Auto Scaling automatically registers instances with the target group.
Clue confirmation
The clue word "best" in the question point toward this answer.
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 PAS-C01 NAT questions on configuration and troubleshooting.
Technology — This question tests Technology — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Attach the Auto Scaling group to an ALB target group. — Option C is correct: The Auto Scaling group can be attached to the ALB target group, so instances are automatically registered. Option A is wrong because user data can configure the instance but not register with Web Dispatcher directly. Option B is wrong because CloudWatch Events can trigger a Lambda, but this is more complex. Option D is wrong because Systems Manager State Manager can run scripts, but not as straightforward as attaching to ALB.
What should I do if I get this PAS-C01 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 PAS-C01 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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