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 system uses a Multi-AZ RDS for Oracle instance. During a recent failover, the application experienced a long outage because the SAP application server did not automatically reconnect to the new database endpoint. What is the most efficient way to resolve this issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Reduce the DNS TTL for the RDS endpoint and ensure the application re-resolves DNS on connection failure.
Option A is correct because the RDS endpoint remains the same after failover; the issue is DNS caching. Reducing the TTL ensures the application picks up the new IP quickly. Option B (rebooting) is disruptive and not a fix. Option C (modifying the connection string) is not needed. Option D (using a load balancer) adds complexity and latency.
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.
✓
Reduce the DNS TTL for the RDS endpoint and ensure the application re-resolves DNS on connection failure.
Why this is correct
Low TTL and re-resolution enable fast failover recovery.
Related concept
Standard ACLs match source addresses.
✗
Reboot the application server after every failover.
Why it's wrong here
Manual reboot is inefficient and causes downtime.
✗
Deploy an Application Load Balancer in front of the RDS instance.
Why it's wrong here
ALB is not designed for database connections.
✗
Modify the application connection string to use the standby instance IP directly.
Why it's wrong here
IP changes after failover; using IP is not recommended.
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
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. 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. 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 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.
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: Reduce the DNS TTL for the RDS endpoint and ensure the application re-resolves DNS on connection failure. — Option A is correct because the RDS endpoint remains the same after failover; the issue is DNS caching. Reducing the TTL ensures the application picks up the new IP quickly. Option B (rebooting) is disruptive and not a fix. Option C (modifying the connection string) is not needed. Option D (using a load balancer) adds complexity and latency.
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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