ANS-C01 Network Design Practice Question
A company is deploying a web application across multiple AWS Regions using an Application Load Balancer (ALB) in each Region. The company wants to use AWS Global Accelerator to provide a static IP address and accelerate traffic. The application requires that client IP addresses be preserved in the backend logs. Which configuration should the network engineer use?
⚠ Common exam trap
It's easy for candidates to assume Application Load Balancers can preserve client IPs via X-Forwarded-For headers, but Global Accelerator's architecture changes the source IP at the network layer, making Proxy Protocol with an NLB the only way to preserve the original client IP in the packet itself.
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 Network Load Balancers as endpoints in Global Accelerator.
AWS Global Accelerator preserves the client IP address when using a Network Load Balancer (NLB) as an endpoint. Global Accelerator uses the Proxy Protocol v2 to pass the original client IP to the NLB, which then forwards it to the backend targets. This meets the requirement for client IP preservation in backend logs.
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 Network Load Balancers as endpoints in Global Accelerator.
Why this is correct
NLB preserves source IP addresses when used as a Global Accelerator endpoint.
- ✗
Use VPC endpoints and AWS PrivateLink to route traffic through the Global Accelerator.
Why it's wrong here
PrivateLink is for internal connectivity, not internet-facing.
- ✗
Use Amazon CloudFront in front of the ALBs with origin protocol policy set to HTTPS.
Why it's wrong here
CloudFront does not provide static IP addresses for the application.
- ✗
Use Application Load Balancers as endpoints and enable X-Forwarded-For header logging.
Why it's wrong here
Global Accelerator with ALB does not preserve client IP; the ALB sees the accelerator's IP.
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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.