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 servers are in private subnets behind Network Load Balancers (NLBs). The company needs to ensure that traffic from a client is consistently routed to the same ALB endpoint for the duration of a session. Which configuration should be used?
⚠ Common exam trap
Many candidates assume stickiness must be configured on the NLB or that proxy protocol is required, but they overlook that Global Accelerator can preserve the client IP, which is the key to enabling ALB-based stickiness using the client IP as the persistence key.
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
✓
Enable client IP address preservation on the Global Accelerator endpoint groups and configure stickiness on the ALB based on the client IP.
Global Accelerator preserves the client IP address when client IP address preservation is enabled on the endpoint group, allowing the ALB to see the original client IP. Configuring stickiness on the ALB based on the client IP ensures that all requests from the same client IP are routed to the same ALB endpoint for the duration of the session, which is essential for session persistence in an active-active multi-region architecture.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure cross-zone load balancing on the NLBs and enable stickiness on the target groups.
Why it's wrong here
Cross-zone load balancing distributes traffic evenly, not session persistence.
- ✗
Enable proxy protocol on the NLB target groups and configure stickiness on the NLB.
Why it's wrong here
NLB does not support stickiness based on client IP.
- ✗
Enable stickiness on the ALB target groups with a duration of 1 second.
Why it's wrong here
ALB stickiness only works within a single ALB, not across regions.
- ✓
Enable client IP address preservation on the Global Accelerator endpoint groups and configure stickiness on the ALB based on the client IP.
Why this is correct
This ensures sessions are consistently routed to the same ALB based on the client's IP.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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