ANS-C01 Network Design Practice Question
A company is deploying an application that requires low-latency communication between EC2 instances in two different AWS Regions. The application traffic is latency-sensitive and the company wants to minimize jitter. Which network design provides the lowest and most consistent latency?
⚠ Common exam trap
Candidates often assume VPC peering (Option A) is the best for inter-Region traffic because it's private, but they overlook that Global Accelerator provides superior latency consistency by using anycast and AWS's optimized backbone, while VPC peering still routes through the AWS global network without traffic engineering for jitter reduction.
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 AWS Global Accelerator with endpoints in both Regions and use the accelerator's static IP addresses for communication.
AWS Global Accelerator uses the AWS global network and Anycast static IP addresses to route traffic over optimized paths, providing lower and more consistent latency than VPC peering, internet transit, or VPNs. It minimizes jitter by avoiding the public internet and leveraging AWS's internal backbone, which is ideal for latency-sensitive inter-Region communication.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a VPC peering connection between the two VPCs and route traffic through the peering connection.
Why it's wrong here
VPC peering does not support inter-region peering? Actually it does, but traffic traverses the AWS backbone, but still may not be optimized for latency. Global Accelerator is better.
- ✗
Use internet gateways and route traffic over the public internet between the instances.
Why it's wrong here
Public internet introduces variable latency and jitter.
- ✗
Use a Site-to-Site VPN connection between the two VPCs over the internet.
Why it's wrong here
VPN adds latency due to encryption and uses the public internet which is variable.
- ✓
Deploy an AWS Global Accelerator with endpoints in both Regions and use the accelerator's static IP addresses for communication.
Why this is correct
Global Accelerator uses the AWS global network to route traffic over optimized paths, reducing latency and jitter.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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