DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 serverless application using AWS Lambda, Amazon API Gateway, and Amazon DynamoDB. The application must tolerate a Regional failure. Which design provides the most resilience?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use DynamoDB global tables with Lambda functions deployed in multiple Regions and Route 53 multi-Region routing
Option C is correct because DynamoDB global tables provide multi-Region, fully replicated tables with automatic conflict resolution, ensuring data availability during a Regional outage. Deploying Lambda functions in multiple Regions with Route 53 multi-Region routing (using health checks and latency-based or weighted routing) allows traffic to fail over to a healthy Region, making the entire serverless stack resilient to a Regional failure.
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 Lambda@Edge to run functions at AWS edge locations
Why it's wrong here
Edge locations are not Regions.
✗
Use DynamoDB auto-scaling and run Lambda in a single Region
Why it's wrong here
Auto-scaling does not protect against Region failure.
✓
Use DynamoDB global tables with Lambda functions deployed in multiple Regions and Route 53 multi-Region routing
Why this is correct
Global tables and multi-Region deployment provide resilience.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use DynamoDB Accelerator (DAX) to cache data across Regions
Why it's wrong here
DAX is a cache, not for DR.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse caching (DAX) or edge computing (Lambda@Edge) with true multi-Region replication and failover, assuming they provide Regional resilience when they do not.
Detailed technical explanation
How to think about this question
DynamoDB global tables use a last-writer-wins (LWW) conflict resolution mechanism based on the timestamp in the DynamoDB record, and replication is asynchronous with sub-second latency in most cases. Route 53 multi-Region routing can be combined with active-passive or active-active failover patterns, where health checks monitor the API Gateway endpoints in each Region; when a Region becomes unhealthy, Route 53 automatically routes traffic to the healthy Region, and Lambda functions must be deployed with identical code and configuration (e.g., same IAM roles, environment variables) to ensure seamless failover.
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
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.
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: Use DynamoDB global tables with Lambda functions deployed in multiple Regions and Route 53 multi-Region routing — Option C is correct because DynamoDB global tables provide multi-Region, fully replicated tables with automatic conflict resolution, ensuring data availability during a Regional outage. Deploying Lambda functions in multiple Regions with Route 53 multi-Region routing (using health checks and latency-based or weighted routing) allows traffic to fail over to a healthy Region, making the entire serverless stack resilient to a Regional failure.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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