ANS-C01 Network Design Practice Question
A company is designing a multi-region active-active architecture using Application Load Balancers (ALBs) and AWS Global Accelerator. The application must have the lowest possible latency for global users. Which design meets these requirements?
⚠ Common exam trap
Many candidates confuse DNS-based routing (Route 53 latency routing) with anycast-based routing (Global Accelerator), not realizing that DNS caching and propagation delays prevent true real-time, lowest-latency routing for active-active architectures.
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
✓
Use AWS Global Accelerator with endpoints in both regions and configure traffic dials to distribute traffic.
AWS Global Accelerator uses the Anycast static IP addresses to route traffic over the AWS global network to the optimal endpoint based on health, latency, and traffic dials. By configuring endpoints in both regions with traffic dials, you can distribute traffic actively across both regions, ensuring the lowest possible latency for global users by directing them to the nearest healthy endpoint.
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 AWS Global Accelerator with endpoints in both regions and configure traffic dials to distribute traffic.
Why this is correct
Global Accelerator provides anycast IPs and can distribute traffic across multiple regions with traffic dials.
- ✗
Use Amazon CloudFront with multiple origins pointing to each ALB.
Why it's wrong here
CloudFront is for HTTP/HTTPS content delivery, not for TCP/UDP traffic.
- ✗
Use Amazon Route 53 with latency routing policy to route users to the closest ALB.
Why it's wrong here
Route 53 latency routing uses DNS, which can introduce caching and does not provide anycast IPs.
- ✗
Use AWS Global Accelerator with a single endpoint in one region and failover to the other region.
Why it's wrong here
This is active-passive, not active-active.
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