- A
The SAP application layer is not configured to retry connections.
Why wrong: Application retry logic is important but does not cause failover to fail.
- B
The CloudWatch alarm thresholds for failover are set too high.
Why wrong: CloudWatch alarms do not trigger failover; they only monitor.
- C
The route tables or security groups do not allow traffic to the secondary instance.
Network configuration errors can prevent failover from completing.
- D
The secondary instance's IP address is not automatically updated in DNS.
Why wrong: Multi-AZ deployments typically use DNS updates, but this is not the primary issue.
Question 947 of 1,733
Troubleshooting SAP Multi-AZ Failover: Route Tables and Security Groups
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 system on AWS is configured with a Multi-AZ deployment for high availability. During a failover test, the operations team notices that the secondary instance does not take over correctly. 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 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
✓
The route tables or security groups do not allow traffic to the secondary instance.
Option C is correct because after a failover, the secondary instance becomes the active one, and if route tables or security groups do not permit traffic to it, clients cannot connect, causing the failover to appear ineffective. Option A is incorrect because the SAP application layer retry connections may affect user experience but not the failover mechanism itself. Option B is incorrect because CloudWatch alarms are monitoring thresholds and do not directly control failover behavior. Option D is incorrect because in a properly configured Multi-AZ setup, IP address changes are handled automatically (e.g., via Elastic IP or DNS updates), so this is less likely to be the root cause.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 SAP application layer is not configured to retry connections.
Why it's wrong here
Application retry logic is important but does not cause failover to fail.
- ✗
The CloudWatch alarm thresholds for failover are set too high.
Why it's wrong here
CloudWatch alarms do not trigger failover; they only monitor.
- ✓
The route tables or security groups do not allow traffic to the secondary instance.
Why this is correct
Network configuration errors can prevent failover from completing.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✗
The secondary instance's IP address is not automatically updated in DNS.
Why it's wrong here
Multi-AZ deployments typically use DNS updates, but this is not the primary issue.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Quick reference
OSI Model Reference
| Layer | Name | PDU | Key Protocols / Devices |
|---|---|---|---|
| 7 | Application | Data | HTTP, HTTPS, DNS, SMTP, FTP, SSH |
| 6 | Presentation | Data | TLS / SSL, JPEG, ASCII encoding |
| 5 | Session | Data | NetBIOS, RPC, SIP |
| 4 | Transport | Segment / Datagram | TCP, UDP |
| 3 | Network | Packet | IP, ICMP, OSPF — Routers |
| 2 | Data Link | Frame | Ethernet, Wi-Fi, PPP — Switches, Bridges |
| 1 | Physical | Bits | Cables, NICs, Hubs, Repeaters |
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PAS-C01 ACL questions on filtering logic and placement.
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Operations and Maintenance — study guide chapter
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Operations and Maintenance — This question tests Operations and Maintenance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The route tables or security groups do not allow traffic to the secondary instance. — Option C is correct because after a failover, the secondary instance becomes the active one, and if route tables or security groups do not permit traffic to it, clients cannot connect, causing the failover to appear ineffective. Option A is incorrect because the SAP application layer retry connections may affect user experience but not the failover mechanism itself. Option B is incorrect because CloudWatch alarms are monitoring thresholds and do not directly control failover behavior. Option D is incorrect because in a properly configured Multi-AZ setup, IP address changes are handled automatically (e.g., via Elastic IP or DNS updates), so this is less likely to be the root cause.
What should I do if I get this PAS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PAS-C01 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on PAS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An SAP system on AWS is configured with a multi-AZ deployment for high availability. During a failover test, the secondary instance does not take over as expected. The administrator checks the AWS Management Console and sees that the Elastic IP address is still attached to the primary instance. What is the most likely cause?
hard- ✓ A.The Elastic IP is not reassigned during the failover process
- B.The secondary instance's root volume is not attached
- C.The security group of the secondary instance blocks incoming traffic
- D.The route tables are not updated to point to the secondary instance
Why A: In a typical HA setup, the Elastic IP should be reassigned to the secondary instance during failover. If it remains attached to the primary, the secondary cannot be reached. The root device is not relevant to IP assignment. Route tables are not per-instance. Security groups allow traffic but do not prevent failover.
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Last reviewed: Jun 20, 2026
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