- A
Enable automated backups with a short retention period.
Why wrong: Backups are unrelated to failover connection handling.
- B
Increase the TTL of the RDS DNS record to 300 seconds.
Why wrong: Higher TTL means clients cache old IP longer, increasing downtime.
- C
Configure the application's connection string to use the RDS read-replica endpoint with a retry mechanism.
Using the read replica endpoint can redirect traffic faster; retries help re-establish connections.
- D
Place a Network Load Balancer in front of the RDS instance.
Why wrong: NLB does not support RDS directly; adds unnecessary complexity.
Question 1,036 of 1,733
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 a critical workload on Amazon RDS for PostgreSQL with Multi-AZ. The operations team notices that during a recent failover test, the DNS record updated in about 60 seconds. However, the application experienced a 2-minute downtime because some connections were not re-established quickly. What should the team do to reduce downtime during failover?
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
✓
Configure the application's connection string to use the RDS read-replica endpoint with a retry mechanism.
Option C is correct because, during a Multi-AZ failover, the RDS DNS record is updated to point to the standby instance. However, DNS caching at the client side can cause delays. By configuring the application to use a retry mechanism on the same RDS endpoint (not a separate read-replica endpoint), connections are re-established quickly after failover completes, without waiting for DNS TTL expiry. This reduces downtime compared to approaches that rely solely on DNS propagation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable automated backups with a short retention period.
Why it's wrong here
Backups are unrelated to failover connection handling.
- ✗
Increase the TTL of the RDS DNS record to 300 seconds.
Why it's wrong here
Higher TTL means clients cache old IP longer, increasing downtime.
- ✓
Configure the application's connection string to use the RDS read-replica endpoint with a retry mechanism.
Why this is correct
Using the read replica endpoint can redirect traffic faster; retries help re-establish connections.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Place a Network Load Balancer in front of the RDS instance.
Why it's wrong here
NLB does not support RDS directly; adds unnecessary complexity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think increasing DNS TTL speeds up failover, but in reality, a higher TTL increases client-side caching delay, making downtime worse, while the correct approach is to use a static endpoint (like the read-replica endpoint) with retry logic to bypass DNS propagation issues entirely.
Detailed technical explanation
How to think about this question
During a Multi-AZ failover, RDS updates the DNS record to point to the standby instance, but DNS caching at the client or resolver level can cause delays up to the TTL value (default 60 seconds). Using the read-replica endpoint (which is a CNAME pointing to the current primary) avoids this because the application reconnects to a static endpoint that is updated internally by RDS without relying on client-side DNS cache expiry. The retry mechanism is critical because the failover itself takes a few seconds, and the application must handle transient connection failures gracefully.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Visual reference
Quick reference
Common DNS Record Types
| Record | Purpose | Example |
|---|---|---|
| A | IPv4 address mapping | example.com → 93.184.216.34 |
| AAAA | IPv6 address mapping | example.com → 2606:2800::1 |
| CNAME | Alias to another hostname | www → example.com |
| MX | Mail server for domain | example.com → mail.example.com (priority 10) |
| TXT | Text data (SPF, DKIM, verification) | v=spf1 include:_spf.example.com ~all |
| NS | Authoritative name servers | example.com NS ns1.example.com |
| PTR | Reverse DNS (IP → hostname) | 34.216.184.93.in-addr.arpa → example.com |
| SOA | Zone authority record | Primary NS, admin email, serial, TTL defaults |
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the application's connection string to use the RDS read-replica endpoint with a retry mechanism. — Option C is correct because, during a Multi-AZ failover, the RDS DNS record is updated to point to the standby instance. However, DNS caching at the client side can cause delays. By configuring the application to use a retry mechanism on the same RDS endpoint (not a separate read-replica endpoint), connections are re-established quickly after failover completes, without waiting for DNS TTL expiry. This reduces downtime compared to approaches that rely solely on DNS propagation.
What should I do if I get this PAS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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