- A
Deploy a Read Replica in another Availability Zone and configure the application to use it as a failover target
Why wrong: Read Replicas are designed for scaling read traffic and do not provide automatic failover. Promoting a Read Replica to become a primary instance requires manual intervention, which does not meet the requirement for automatic failover and minimal downtime.
- B
Enable automated backups with point-in-time recovery
Why wrong: Automated backups and point-in-time recovery allow you to restore your database to a specific point in time, but the restore process is not automatic and can take significant time. This does not provide the active high availability or automatic failover required.
- C
Manually provision a standby database instance in another Availability Zone and configure a custom failover script
Why wrong: While this approach could theoretically provide failover, it requires significant manual effort to manage synchronization, monitor health, and trigger failover. Amazon RDS Multi-AZ automates all these steps, including updating the DNS endpoint, so the application connection string remains unchanged. A manual solution does not meet the requirement for minimal downtime and simplicity.
- D
Configure a Multi-AZ deployment for the Amazon RDS database instance
Multi-AZ deployments create a synchronous standby replica in a different Availability Zone. Amazon RDS automatically handles failover to the standby replica when a failure is detected, and updates the DNS record so that the same connection endpoint continues to work without any application changes. This meets all the stated requirements.
Quick Answer
The answer is to configure a Multi-AZ deployment for the Amazon RDS database instance. This feature automatically provisions a synchronous standby replica in a different Availability Zone, so if the primary instance or its entire AZ fails, Amazon RDS automatically fails over to the standby. The DNS record for the database endpoint is updated to point to the standby, meaning the application’s connection string never changes, and no manual intervention is required. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your understanding of high availability versus disaster recovery—Multi-AZ handles AZ-level failures with automatic failover, while read replicas do not. A common trap is confusing Multi-AZ with read replicas; remember that Multi-AZ is for failover, not for scaling reads. Memory tip: “Multi-AZ = Mirror in Another Zone” for automatic failover without connection string changes.
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. 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 a critical e-commerce application that uses an Amazon RDS for MySQL database deployed in a single Availability Zone. The company needs to ensure that the database remains available if the underlying hardware or the entire Availability Zone fails. The solution must provide automatic failover with minimal downtime and must not require any changes to the application's database connection string. Which Amazon RDS feature should the company use to meet these requirements?
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 a Multi-AZ deployment for the Amazon RDS database instance
Option D is correct because a Multi-AZ deployment for Amazon RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone. In the event of a failure, Amazon RDS automatically fails over to the standby, and the DNS record for the database endpoint is updated to point to the standby, so the application's connection string remains unchanged. This provides automatic failover with minimal downtime without requiring any manual intervention or application changes.
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.
- ✗
Deploy a Read Replica in another Availability Zone and configure the application to use it as a failover target
Why it's wrong here
Read Replicas are designed for scaling read traffic and do not provide automatic failover. Promoting a Read Replica to become a primary instance requires manual intervention, which does not meet the requirement for automatic failover and minimal downtime.
- ✗
Enable automated backups with point-in-time recovery
Why it's wrong here
Automated backups and point-in-time recovery allow you to restore your database to a specific point in time, but the restore process is not automatic and can take significant time. This does not provide the active high availability or automatic failover required.
- ✗
Manually provision a standby database instance in another Availability Zone and configure a custom failover script
Why it's wrong here
While this approach could theoretically provide failover, it requires significant manual effort to manage synchronization, monitor health, and trigger failover. Amazon RDS Multi-AZ automates all these steps, including updating the DNS endpoint, so the application connection string remains unchanged. A manual solution does not meet the requirement for minimal downtime and simplicity.
- ✓
Configure a Multi-AZ deployment for the Amazon RDS database instance
Why this is correct
Multi-AZ deployments create a synchronous standby replica in a different Availability Zone. Amazon RDS automatically handles failover to the standby replica when a failure is detected, and updates the DNS record so that the same connection endpoint continues to work without any application changes. This meets all the stated requirements.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Read Replicas (which are for read scaling and require manual promotion) with Multi-AZ deployments (which provide automatic failover with no application changes), leading them to incorrectly select Option A.
Detailed technical explanation
How to think about this question
In a Multi-AZ deployment, Amazon RDS synchronously replicates data to the standby instance using the MySQL replication protocol, ensuring zero data loss during failover. The failover process typically completes within 60–120 seconds, during which the DNS record is automatically updated to point to the standby, so the application only experiences a brief connection interruption. This feature is transparent to the application and does not require any changes to the database connection string, making it ideal for critical e-commerce applications that demand high availability.
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
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.
What to study next
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure a Multi-AZ deployment for the Amazon RDS database instance — Option D is correct because a Multi-AZ deployment for Amazon RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone. In the event of a failure, Amazon RDS automatically fails over to the standby, and the DNS record for the database endpoint is updated to point to the standby, so the application's connection string remains unchanged. This provides automatic failover with minimal downtime without requiring any manual intervention or application changes.
What should I do if I get this CLF-C02 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.
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
2 more ways this is tested on CLF-C02
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 an e-commerce application using Amazon RDS for MySQL. The database stores order and customer information. To achieve high availability, the company configures a Multi-AZ deployment. Which of the following describes a benefit of this configuration?
medium- A.It automatically scales the database read capacity to handle traffic spikes.
- ✓ B.It automatically fails over to a standby instance in a different Availability Zone if the primary instance fails.
- C.It creates read replicas in multiple Regions to reduce latency for global users.
- D.It encrypts data at rest using AWS KMS without any additional configuration.
Why B: Option B is correct because a Multi-AZ deployment for Amazon RDS automatically synchronously replicates data to a standby instance in a different Availability Zone. If the primary instance fails (due to hardware failure, AZ outage, or patching), Amazon RDS automatically performs a failover to the standby, promoting it to become the new primary. This provides high availability by minimizing downtime without requiring manual intervention.
Variation 2. A company runs a web application on Amazon EC2 instances that connect to a relational database. The application requires high database availability so that if the primary database instance fails, a standby instance automatically takes over without manual intervention. The company wants to minimize administrative overhead for database patching, backups, and replication. Which AWS service should the company use to meet these requirements?
medium- ✓ A.Amazon RDS Multi-AZ
- B.Amazon RDS Single-AZ
- C.Amazon DynamoDB Global Tables
- D.Amazon S3
Why A: Amazon RDS Multi-AZ provides high availability by automatically provisioning and maintaining a synchronous standby replica in a different Availability Zone. If the primary database instance fails, Amazon RDS automatically fails over to the standby, ensuring minimal downtime without manual intervention. Additionally, RDS handles patching, backups, and replication automatically, reducing administrative overhead.
Last reviewed: Jun 11, 2026
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CLF-C02 exam.
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