This ANS-C01 practice question tests your understanding of network design. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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.
Option D is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often 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.
Detailed technical explanation
How to think about this question
When client IP address preservation is enabled on a Global Accelerator endpoint group, the accelerator forwards packets with the original source IP address unchanged, so the ALB sees the client's real IP rather than the accelerator's IP. The ALB then uses this client IP as the stickiness key, ensuring that all requests from that IP are sent to the same target (e.g., a specific application server) for the configured duration. In a multi-region setup, this prevents session breakage if a client's traffic is routed to a different ALB due to Global Accelerator's routing changes.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable client IP address preservation on the Global Accelerator endpoint groups and configure stickiness on the ALB based on the client IP. — Option D is correct because 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.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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