Global Accelerator with ALB for Lowest Latency
A company is deploying a latency-sensitive application across two AWS Regions using Application Load Balancers (ALBs) and AWS Global Accelerator. The application uses TCP port 8443. Which configuration ensures the lowest possible latency for global users?
Quick Answer
The correct answer is to use AWS Global Accelerator with endpoints as the Application Load Balancers in each Region. This configuration achieves the lowest possible latency because Global Accelerator routes traffic over the AWS global network using anycast IPs, bypassing the public internet and automatically directing users to the nearest healthy endpoint. For the ANS-C01 exam, this question tests your understanding of how Global Accelerator optimizes latency-sensitive TCP traffic across multiple Regions, contrasting it with Route 53 latency routing, which still relies on public internet hops, and CloudFront, which only supports HTTP/HTTPS. A common trap is assuming a Network Load Balancer can handle multi-region routing, but it lacks Global Accelerator’s anycast and regional endpoint failover. Remember the memory tip: “Anycast ALBs beat public-path DNS” — Global Accelerator’s anycast IPs always provide the shortest path over AWS’s private backbone for TCP traffic.
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that CloudFront can handle any TCP port or that DNS-based routing (Route 53) can match the latency performance of edge-optimized services like Global Accelerator, leading candidates to overlook the protocol limitations and routing inefficiencies.
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 as the ALBs in each Region.
AWS Global Accelerator uses the Anycast static IP addresses to route traffic over the AWS global network to the optimal ALB endpoint, minimizing internet hops and latency. For TCP port 8443, Global Accelerator preserves the client IP and provides connection termination at the edge, ensuring the lowest possible latency for global users by avoiding the public internet.
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 Amazon CloudFront with the ALBs as origins.
Why it's wrong here
CloudFront supports only HTTP/HTTPS, not TCP 8443.
- ✗
Use Amazon Route 53 latency-based routing with ALB endpoints in each Region.
Why it's wrong here
Route 53 does not optimize network path; uses public internet.
- ✓
Use AWS Global Accelerator with endpoints as the ALBs in each Region.
Why this is correct
Global Accelerator uses anycast and AWS backbone for lower latency.
- ✗
Deploy a Network Load Balancer in each Region and use Route 53 geoproximity routing.
Why it's wrong here
Still uses public internet; NLB is single-region.
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Variation 1. A company is deploying a latency-sensitive application across multiple AWS Regions. They want to use the AWS global network to route traffic to the nearest edge location for fast content delivery. Which service should they use?
hard- ✓ A.AWS Global Accelerator
- B.Amazon Route 53
- C.AWS Direct Connect
- D.Amazon CloudFront
Why A: AWS Global Accelerator uses the AWS global network to direct traffic to the nearest edge location via Anycast IP addresses, then routes it over the AWS backbone to the optimal regional endpoint. This minimizes latency and jitter for latency-sensitive applications by avoiding the public internet and providing static IP addresses for traffic management.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.