- A
Use the RDS endpoint (CNAME) provided by RDS, which automatically points to the primary instance.
The RDS endpoint is a DNS CNAME that updates after failover, ensuring seamless redirection.
- B
Create a custom Route 53 failover routing policy pointing to both DB instances.
Why wrong: Custom DNS adds complexity; RDS already provides a CNAME that updates automatically.
- C
Modify the application connection string to point to the new primary IP address after each failover.
Why wrong: Manual modification is not automated and leads to errors.
- D
Configure the application to use a static IP address of the primary instance.
Why wrong: Static IP is not recommended because the IP can change after failover.
Question 453 of 1,730
Using RDS Endpoint for Automatic Failover Redirection
This DBS-C01 practice question tests your understanding of management and operations. 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 is running an Amazon RDS for PostgreSQL DB instance with Multi-AZ. The database experiences a failover during a maintenance window. After the failover, the application connection pool continues to use the old primary endpoint, causing connection errors. What is the BEST way to ensure application connections automatically redirect to the new primary after a failover?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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
✓
Use the RDS endpoint (CNAME) provided by RDS, which automatically points to the primary instance.
The RDS endpoint (CNAME) provided by Amazon RDS automatically points to the current primary instance. After a failover, RDS updates the CNAME record to point to the new primary, so application connections using the endpoint are seamlessly redirected without manual intervention. This is the simplest and most reliable approach. Option B (Custom Route 53 failover routing) is unnecessary because RDS already provides a managed DNS endpoint. Option C (modifying connection string manually) is not automated and prone to human error. Option D (static IP) is not practical as RDS instances do not have static IPs; the DNS endpoint handles failover transparently.
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.
- ✓
Use the RDS endpoint (CNAME) provided by RDS, which automatically points to the primary instance.
Why this is correct
The RDS endpoint is a DNS CNAME that updates after failover, ensuring seamless redirection.
Clue confirmation
The clue words "best", "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a custom Route 53 failover routing policy pointing to both DB instances.
Why it's wrong here
Custom DNS adds complexity; RDS already provides a CNAME that updates automatically.
- ✗
Modify the application connection string to point to the new primary IP address after each failover.
Why it's wrong here
Manual modification is not automated and leads to errors.
- ✗
Configure the application to use a static IP address of the primary instance.
Why it's wrong here
Static IP is not recommended because the IP can change after failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Management and Operations — This question tests Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the RDS endpoint (CNAME) provided by RDS, which automatically points to the primary instance. — The RDS endpoint (CNAME) provided by Amazon RDS automatically points to the current primary instance. After a failover, RDS updates the CNAME record to point to the new primary, so application connections using the endpoint are seamlessly redirected without manual intervention. This is the simplest and most reliable approach. Option B (Custom Route 53 failover routing) is unnecessary because RDS already provides a managed DNS endpoint. Option C (modifying connection string manually) is not automated and prone to human error. Option D (static IP) is not practical as RDS instances do not have static IPs; the DNS endpoint handles failover transparently.
What should I do if I get this DBS-C01 question wrong?
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "best", "primary". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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 DBS-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. A company runs a production Amazon RDS for MySQL Multi-AZ DB instance. The database experiences a failover event. After the failover, the application team reports increased latency for write operations. Which action should be taken to investigate the issue?
medium- A.Increase the allocated storage for the DB instance to reduce I/O contention.
- B.Enable automated backups and configure a backup window.
- ✓ C.Verify that the application is using the correct DB endpoint and that DNS has propagated.
- D.Modify the DB instance to a larger instance class to improve write performance.
Why C: Option C is correct because after a failover, the DNS record updates to point to the new primary. If DNS has not propagated, the application may be connecting to the old primary or experiencing routing issues, leading to increased write latency. Verifying DNS resolution ensures the application is using the correct endpoint. Option A is incorrect because increasing storage does not directly address latency caused by DNS propagation; it might help with I/O contention under normal conditions, but it is not the appropriate first step for investigating post-failover latency. Option B is incorrect because automated backups do not impact write latency; they run in the background and do not interfere with database operations. Option D is incorrect because changing the instance class can improve performance, but the immediate issue after failover is likely DNS propagation, not insufficient compute capacity.
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Last reviewed: Jun 20, 2026
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