This ANS-C01 practice question tests your understanding of network design. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 application using Application Load Balancers (ALBs) behind AWS Global Accelerator. The application uses Aurora MySQL global database. Which design should be used to minimize cross-region latency for writes?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy an ALB in each region with a Global Accelerator endpoint group containing both ALBs.
Option D is correct because deploying an ALB in each region and adding both to a Global Accelerator endpoint group enables active-active traffic distribution with optimal path routing via the AWS global network. Global Accelerator uses Anycast IPs to direct user traffic to the nearest healthy endpoint, minimizing latency. For writes to an Aurora MySQL global database, the primary region handles all write operations, but Global Accelerator ensures that write requests are routed to the primary region's ALB with the lowest possible latency from the client's location, while read traffic can be served locally from the secondary region's ALB.
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.
✗
Use Route 53 latency-based routing with a single ALB in the primary region.
Why it's wrong here
Single ALB does not provide active-active; writes go to one region.
✗
Use Amazon CloudFront with origins in both regions and cache invalidation for writes.
Why it's wrong here
CloudFront is for static/dynamic content, not optimal for write-heavy database traffic.
✗
Use Global Accelerator with a single ALB endpoint in one region and failover to the second region.
Why it's wrong here
Active-active requires both endpoints active, not failover.
✓
Deploy an ALB in each region with a Global Accelerator endpoint group containing both ALBs.
Why this is correct
Global Accelerator with two endpoints provides active-active, anycast routing to the nearest region.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
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 Global Accelerator only supports active-passive failover, but it actually supports active-active configurations with multiple endpoints in an endpoint group, which is essential for minimizing cross-region latency in a multi-region setup.
Detailed technical explanation
How to think about this question
Global Accelerator leverages the AWS global network and Anycast IPs to route traffic to the optimal endpoint based on health, latency, and geography, bypassing the public internet. For Aurora MySQL global database, writes must be directed to the primary DB cluster in the primary region; Global Accelerator can be configured with traffic dials to send write traffic to the primary region's ALB while still allowing read traffic to the secondary region's ALB. Under the hood, Global Accelerator uses TCP termination at edge locations and maintains persistent connections to endpoints, reducing jitter and improving performance for latency-sensitive writes.
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: Deploy an ALB in each region with a Global Accelerator endpoint group containing both ALBs. — Option D is correct because deploying an ALB in each region and adding both to a Global Accelerator endpoint group enables active-active traffic distribution with optimal path routing via the AWS global network. Global Accelerator uses Anycast IPs to direct user traffic to the nearest healthy endpoint, minimizing latency. For writes to an Aurora MySQL global database, the primary region handles all write operations, but Global Accelerator ensures that write requests are routed to the primary region's ALB with the lowest possible latency from the client's location, while read traffic can be served locally from the secondary region's ALB.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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