ANS-C01 Network Design Practice Question
A global company is deploying a multi-Region application on AWS. The application requires low-latency access to a shared dataset that is updated frequently in multiple Regions. The company wants to use Amazon Route 53 latency-based routing to direct users to the closest Region. Which data store provides the best combination of low-latency reads and cross-Region consistency for this use case?
⚠ Common exam trap
Candidates often assume DynamoDB global tables provide strong consistency across Regions, but they only offer eventual consistency for cross-Region reads, while ElastiCache Global Datastore provides stronger consistency with lower latency for frequently updated datasets.
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
✓
Amazon ElastiCache for Redis Global Datastore
Amazon ElastiCache for Redis Global Datastore provides sub-millisecond read latency by serving data from in-memory caches, and it offers cross-Region consistency by replicating writes from a primary Region to read replicas in secondary Regions with minimal lag. This combination meets the requirement for low-latency access to a frequently updated shared dataset across multiple Regions, as it avoids the higher latency of disk-based storage and the eventual consistency delays of other options.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon S3 with cross-Region replication
Why it's wrong here
S3 is not suitable for sub-millisecond latency.
- ✗
Amazon Aurora Global Database
Why it's wrong here
Aurora Global Database has a replication lag of about 1 second.
- ✓
Amazon ElastiCache for Redis Global Datastore
Why this is correct
Redis Global Datastore provides sub-millisecond reads and cross-Region replication.
- ✗
Amazon DynamoDB global tables with eventually consistent reads
Why it's wrong here
Eventually consistent reads have higher latency than Redis.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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