The answer is that the SAP application (disp+work) is not running on the instance. This is the most likely cause because the ELB health check targets the path /sap/public/ping, which is only served by a live SAP application server process; if disp+work is stopped or crashed, the web dispatcher or ICM cannot respond, and the health check fails with a 503 or connection refused. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding that ELB health checks verify application-level availability, not just network or instance status—a common trap is assuming security groups or incorrect paths are the root cause, but those would produce timeouts or 404s, not a failed health check. Remember the memory tip: “No disp, no ping”—if the SAP dispatcher isn’t running, the ping endpoint goes silent.
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 administrator notices that the SAP application server is failing health checks in the Elastic Load Balancer (ELB) target group. The application server runs on an EC2 instance behind an Application Load Balancer. The health check path is /sap/public/ping. What is the most likely cause of the failure?
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 SAP application (e.g., disp+work) is not running on the instance
Option C is correct because if the SAP application is not running, it cannot respond to the health check. Option A (security group) would cause connection timeout, not health check failure. Option B (wrong path) would return 404 but still be considered unhealthy. Option D (SAProuter) is not relevant to application health.
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.
✗
SAProuter is blocking the health check requests
Why it's wrong here
SAProuter is used for network routing between SAP systems, not for health checks.
✗
The health check path is incorrectly configured in the target group
Why it's wrong here
Wrong path would return 404, but the health check would still fail; however, the most likely cause is the app not running.
✗
The EC2 instance security group does not allow inbound traffic from the ELB
Why it's wrong here
Security group misconfiguration would cause connection timeout, not health check failure.
✓
The SAP application (e.g., disp+work) is not running on the instance
Why this is correct
If the SAP application is down, the health check endpoint is unreachable.
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.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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.
Operations and Maintenance — This question tests Operations and Maintenance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The SAP application (e.g., disp+work) is not running on the instance — Option C is correct because if the SAP application is not running, it cannot respond to the health check. Option A (security group) would cause connection timeout, not health check failure. Option B (wrong path) would return 404 but still be considered unhealthy. Option D (SAProuter) is not relevant to application health.
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: "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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