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Resilient Cloud Solutions →hardMultiple SelectObjective-mapped

DOP-C02 Resilient Cloud Solutions Practice Question

This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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 designing a disaster recovery plan for a critical application with an RPO of 15 minutes and RTO of 1 hour. The application runs on EC2 instances with an RDS MySQL database. The primary Region is us-east-1. Which THREE actions should they take to meet the RPO and RTO? (Choose three.)

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

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.

A
Schedule automated AMI backups of EC2 instances every 15 minutes
Quick recovery of EC2 instances.
B
Launch EC2 instances in a single Availability Zone in the secondary Region to reduce costs
Why wrong: Single AZ is not fault-tolerant.
C
Configure Route 53 health checks and DNS failover to the secondary Region
Automates traffic redirection.
D
Create a cross-Region read replica of the RDS MySQL database in us-west-2
Provides near real-time replication for RPO.
E
Use AWS CloudFormation StackSets to deploy identical infrastructure in the secondary Region
Why wrong: Infrastructure deployment does not replicate data.

Full breakdown with real-world context →

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

✓

Schedule automated AMI backups of EC2 instances every 15 minutes

Option A is correct because automated AMI backups of EC2 instances every 15 minutes align with the 15-minute RPO by capturing incremental snapshots of the instance volumes. These AMIs can be used to launch replacement EC2 instances in the secondary Region within the 1-hour RTO, provided the infrastructure is pre-staged. The frequency of 15 minutes ensures that data loss is limited to at most 15 minutes of 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.

✓
Schedule automated AMI backups of EC2 instances every 15 minutes
Why this is correct
Quick recovery of EC2 instances.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Launch EC2 instances in a single Availability Zone in the secondary Region to reduce costs
Why it's wrong here
Single AZ is not fault-tolerant.
✓
Configure Route 53 health checks and DNS failover to the secondary Region
Why this is correct
Automates traffic redirection.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Create a cross-Region read replica of the RDS MySQL database in us-west-2
Why this is correct
Provides near real-time replication for RPO.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use AWS CloudFormation StackSets to deploy identical infrastructure in the secondary Region
Why it's wrong here
Infrastructure deployment does not replicate data.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse infrastructure-as-code deployment (CloudFormation StackSets) with actual data replication, mistakenly believing that deploying identical infrastructure alone satisfies the RPO, when in fact continuous database replication is required to meet the 15-minute RPO.

Detailed technical explanation

How to think about this question

Cross-Region read replicas for RDS MySQL use asynchronous replication based on the MySQL binary log (binlog), which typically provides a replication lag of seconds to a few minutes, easily meeting a 15-minute RPO. Route 53 DNS failover with health checks monitors the primary Region's endpoints and automatically updates DNS records to point to the secondary Region when a failure is detected, enabling failover within the RTO. Automated AMI backups every 15 minutes use Amazon EBS snapshots, which are incremental and stored in Amazon S3, allowing rapid restoration of EC2 instances in the secondary Region.

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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

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 DOP-C02 question test?

Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Schedule automated AMI backups of EC2 instances every 15 minutes — Option A is correct because automated AMI backups of EC2 instances every 15 minutes align with the 15-minute RPO by capturing incremental snapshots of the instance volumes. These AMIs can be used to launch replacement EC2 instances in the secondary Region within the 1-hour RTO, provided the infrastructure is pre-staged. The frequency of 15 minutes ensures that data loss is limited to at most 15 minutes of changes.

What should I do if I get this DOP-C02 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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