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Question 378 of 1,740

Resilient Cloud Solutions →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct choice is to deploy an ALB with a warm standby ECS service in us-west-2, Route 53 health checks, and ElastiCache Global Datastore for Redis. This solution meets the 15-minute RPO and 30-minute RTO with the least operational overhead because ElastiCache Global Datastore provides cross-region replication with an RPO measured in seconds and automatic failover, eliminating the need for manual data sync or custom replication scripts. The warm standby ECS Fargate service and pre-provisioned ALB ensure traffic can be redirected via Route 53 health checks within the RTO without manual intervention. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of combining stateless compute with stateful data layer DR—a common trap is overcomplicating the solution by proposing database-level replication for session state when ElastiCache Global Datastore handles it natively. Memory tip: “Stateless compute, stateful cache—Global Datastore saves the day.”

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 (DR) strategy for a stateless web application deployed on Amazon ECS with Fargate. The application is fronted by an Application Load Balancer (ALB) and uses Amazon ElastiCache for Redis for session state. The primary region is us-east-1. The DR plan requires a Recovery Point Objective (RPO) of 15 minutes and a Recovery Time Objective (RTO) of 30 minutes. Which solution meets these requirements with the LEAST operational overhead?

Clue words in this question

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

Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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.

Question 1hardmultiple choice

Full question →

A
Deploy an ALB with a warm standby ECS service in us-west-2. Use Route 53 health checks to route traffic to the secondary region if primary fails. Use ElastiCache Global Datastore for Redis to replicate data across regions.
The warm standby approach with automatic failover and cross-region replication meets RPO and RTO with low operational overhead.
B
Deploy an Active-Active configuration across two AWS regions using Route 53 latency routing. Use ElastiCache for Redis Global Datastore with multi-region writes.
Why wrong: Active-Active adds complexity; ElastiCache Global Datastore supports cross-region replication but not multi-region writes natively.
C
Deploy a Pilot Light environment in us-west-2 with a scaled-down ECS service and Redis cluster. Use Route 53 DNS failover. On disaster, scale up the ECS service and promote the Redis cluster.
Why wrong: Manual scaling and promotion steps may exceed 30 minutes RTO.
D
Use Amazon ECS with Fargate in us-east-1 only, and schedule daily snapshots of ElastiCache for Redis. In case of disaster, restore the snapshot in a new region and update DNS.
Why wrong: Snapshot restore can take longer than 30 minutes and RPO may be up to 24 hours.

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

✓

Deploy an ALB with a warm standby ECS service in us-west-2. Use Route 53 health checks to route traffic to the secondary region if primary fails. Use ElastiCache Global Datastore for Redis to replicate data across regions.

Option A is correct because it uses ElastiCache Global Datastore for Redis, which provides cross-region replication with an RPO of seconds (well within 15 minutes) and automatic failover, minimizing operational overhead. The warm standby ECS service in us-west-2 with Route 53 health checks allows traffic to be redirected within the 30-minute RTO without manual intervention, as the ALB and ECS service are pre-provisioned.

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 an ALB with a warm standby ECS service in us-west-2. Use Route 53 health checks to route traffic to the secondary region if primary fails. Use ElastiCache Global Datastore for Redis to replicate data across regions.
Why this is correct
The warm standby approach with automatic failover and cross-region replication meets RPO and RTO with low operational overhead.
Clue confirmation
The clue words "least", "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deploy an Active-Active configuration across two AWS regions using Route 53 latency routing. Use ElastiCache for Redis Global Datastore with multi-region writes.
Why it's wrong here
Active-Active adds complexity; ElastiCache Global Datastore supports cross-region replication but not multi-region writes natively.
✗
Deploy a Pilot Light environment in us-west-2 with a scaled-down ECS service and Redis cluster. Use Route 53 DNS failover. On disaster, scale up the ECS service and promote the Redis cluster.
Why it's wrong here
Manual scaling and promotion steps may exceed 30 minutes RTO.
✗
Use Amazon ECS with Fargate in us-east-1 only, and schedule daily snapshots of ElastiCache for Redis. In case of disaster, restore the snapshot in a new region and update DNS.
Why it's wrong here
Snapshot restore can take longer than 30 minutes and RPO may be up to 24 hours.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may confuse Pilot Light (Option C) as lower overhead, but it requires manual scaling and promotion steps, whereas a warm standby with Global Datastore automates failover, making it the least operational overhead for the given RPO/RTO.

Detailed technical explanation

How to think about this question

ElastiCache Global Datastore for Redis uses asynchronous replication from a primary region to a secondary region, with typical replication lag under 1 second, ensuring RPO of seconds. Route 53 health checks monitor the ALB endpoint in us-east-1; upon failure, DNS failover automatically directs traffic to the warm standby ALB in us-west-2, which is already associated with the ECS service and Global Datastore replica, enabling near-instant recovery without manual DNS changes.

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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

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: Deploy an ALB with a warm standby ECS service in us-west-2. Use Route 53 health checks to route traffic to the secondary region if primary fails. Use ElastiCache Global Datastore for Redis to replicate data across regions. — Option A is correct because it uses ElastiCache Global Datastore for Redis, which provides cross-region replication with an RPO of seconds (well within 15 minutes) and automatic failover, minimizing operational overhead. The warm standby ECS service in us-west-2 with Route 53 health checks allows traffic to be redirected within the 30-minute RTO without manual intervention, as the ALB and ECS service are pre-provisioned.

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: "least", "primary". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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