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.
A company runs SAP on AWS and uses a Multi-AZ RDS for Oracle as the database. They observe that the database failover took longer than expected during a recent test. What is the most likely cause of the increased failover time?
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 primary instance had a high volume of ongoing transactions that needed to be completed or rolled back before failover could proceed.
Option D is correct because Multi-AZ failover time depends on the time to complete in-flight transactions and synchronize the standby. Option A is wrong because read replicas are not used in Multi-AZ. Option B is wrong because the CNAME record update is typically fast. Option C is wrong because synchronous replication does not cause a long failover; the issue is usually transaction completion.
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 database had a large number of uncommitted transactions that needed to be rolled back.
Why it's wrong here
Uncommitted transactions are handled during failover but are not the primary cause of delay.
✗
The DNS TTL was set too high, causing delays in routing to the new primary.
Why it's wrong here
RDS Multi-AZ uses a CNAME, and DNS TTL is typically 60 seconds; not the major cause.
✓
The primary instance had a high volume of ongoing transactions that needed to be completed or rolled back before failover could proceed.
Why this is correct
RDS waits for pending transactions to complete, which can increase failover time.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The standby instance was not in sync because read replicas were used for reads.
Why it's wrong here
Multi-AZ uses synchronous replication; read replicas are separate.
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: The primary instance had a high volume of ongoing transactions that needed to be completed or rolled back before failover could proceed. — Option D is correct because Multi-AZ failover time depends on the time to complete in-flight transactions and synchronize the standby. Option A is wrong because read replicas are not used in Multi-AZ. Option B is wrong because the CNAME record update is typically fast. Option C is wrong because synchronous replication does not cause a long failover; the issue is usually transaction completion.
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.
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