ANS-C01 Network Design Practice Question
A company is designing a multi-region active-active application using Application Load Balancers (ALBs) behind AWS Global Accelerator. The application uses Aurora MySQL global database. Which design should be used to minimize cross-region latency for writes?
⚠ Common exam trap
Candidates often assume Global Accelerator only supports active-passive failover, but it actually supports active-active configurations with multiple endpoints in an endpoint group, which is essential for minimizing cross-region latency in a multi-region setup.
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 in each region with a Global Accelerator endpoint group containing both ALBs.
Deploying an ALB in each region and adding both to a Global Accelerator endpoint group enables active-active traffic distribution with optimal path routing via the AWS global network. Global Accelerator uses Anycast IPs to direct user traffic to the nearest healthy endpoint, minimizing latency. For writes to an Aurora MySQL global database, the primary region handles all write operations, but Global Accelerator ensures that write requests are routed to the primary region's ALB with the lowest possible latency from the client's location, while read traffic can be served locally from the secondary region's ALB.
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 Route 53 latency-based routing with a single ALB in the primary region.
Why it's wrong here
Single ALB does not provide active-active; writes go to one region.
- ✗
Use Amazon CloudFront with origins in both regions and cache invalidation for writes.
Why it's wrong here
CloudFront is for static/dynamic content, not optimal for write-heavy database traffic.
- ✗
Use Global Accelerator with a single ALB endpoint in one region and failover to the second region.
Why it's wrong here
Active-active requires both endpoints active, not failover.
- ✓
Deploy an ALB in each region with a Global Accelerator endpoint group containing both ALBs.
Why this is correct
Global Accelerator with two endpoints provides active-active, anycast routing to the nearest region.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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