- A
Deploy a Network Load Balancer (NLB) in each region with targets in public subnets. Use Route 53 latency-based routing to the NLB.
Why wrong: NLB does not preserve source IP by default and targets in public subnets do not keep traffic within AWS.
- B
Deploy an internal ALB in each region. Place targets in private subnets. Use VPC endpoints for the ALB (AWS PrivateLink) and Route 53 latency-based routing to the VPC endpoint.
Internal ALB with VPC endpoints keeps traffic within AWS and preserves source IP.
- C
Deploy an Application Load Balancer (ALB) with internet-facing scheme in each region. Use Route 53 latency-based routing to the ALB.
Why wrong: Internet-facing ALB does not keep traffic within AWS and may not preserve source IP for targets in private subnets.
- D
Use AWS Global Accelerator with endpoints in each region. Attach the ALB as an endpoint and enable client IP preservation on the accelerator.
Why wrong: Global Accelerator does not preserve source IP for ALB endpoints; it preserves source IP only for NLB endpoints.
- E
Deploy an ALB with internet-facing scheme in each region. Use Route 53 latency-based routing to the ALB. Place targets in public subnets to preserve source IP.
Why wrong: Targets in public subnets are not recommended and traffic does not stay within AWS.
Quick Answer
The correct answer is to deploy an internal ALB in each region with targets in private subnets, using VPC endpoints (AWS PrivateLink) for the ALB and Route 53 latency-based routing to those endpoints. This configuration preserves the client source IP address because traffic flows through the VPC endpoint to the internal ALB, which then forwards requests to the backend EC2 instances without performing source NAT, while the private subnets ensure all traffic between the ALB and targets remains within the AWS network. On the ANS-C01 exam, this scenario tests your understanding of how PrivateLink integrates with latency routing to maintain source IP transparency across regions—a common trap is assuming a public ALB or a Network Load Balancer is needed, but internal ALBs with PrivateLink are the key. Remember the mnemonic: “LIP” for Latency, Internal, PrivateLink—if you need to keep the client IP and stay inside AWS, think LIP.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 deploying a multi-tier web application across two AWS Regions. The application uses an Application Load Balancer (ALB) in each region, and traffic must be distributed to the closest healthy ALB using Route 53 latency-based routing. The application requires that clients maintain the same source IP address when the request is forwarded from the ALB to the backend targets. The backend targets are EC2 instances in private subnets. The company also needs to ensure that traffic between the ALB and targets stays within AWS. What should the company implement to meet these requirements?
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
Deploy an internal ALB in each region. Place targets in private subnets. Use VPC endpoints for the ALB (AWS PrivateLink) and Route 53 latency-based routing to the VPC endpoint.
Option B is correct because an internal ALB with targets in private subnets ensures traffic stays within AWS and preserves the client source IP by using VPC endpoints (AWS PrivateLink). Route 53 latency-based routing directs traffic to the closest healthy VPC endpoint, meeting the multi-region distribution requirement while maintaining source IP transparency for backend targets.
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.
- ✗
Deploy a Network Load Balancer (NLB) in each region with targets in public subnets. Use Route 53 latency-based routing to the NLB.
Why it's wrong here
NLB does not preserve source IP by default and targets in public subnets do not keep traffic within AWS.
- ✓
Deploy an internal ALB in each region. Place targets in private subnets. Use VPC endpoints for the ALB (AWS PrivateLink) and Route 53 latency-based routing to the VPC endpoint.
Why this is correct
Internal ALB with VPC endpoints keeps traffic within AWS and preserves source IP.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Deploy an Application Load Balancer (ALB) with internet-facing scheme in each region. Use Route 53 latency-based routing to the ALB.
Why it's wrong here
Internet-facing ALB does not keep traffic within AWS and may not preserve source IP for targets in private subnets.
- ✗
Use AWS Global Accelerator with endpoints in each region. Attach the ALB as an endpoint and enable client IP preservation on the accelerator.
Why it's wrong here
Global Accelerator does not preserve source IP for ALB endpoints; it preserves source IP only for NLB endpoints.
- ✗
Deploy an ALB with internet-facing scheme in each region. Use Route 53 latency-based routing to the ALB. Place targets in public subnets to preserve source IP.
Why it's wrong here
Targets in public subnets are not recommended and traffic does not stay within AWS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume internet-facing ALBs preserve source IP or that Global Accelerator can be combined with Route 53 latency-based routing, but AWS specifically requires an internal ALB with PrivateLink and client IP preservation enabled to meet both source IP preservation and traffic confinement requirements.
Detailed technical explanation
How to think about this question
AWS PrivateLink for internal ALBs uses VPC endpoint services that map to the ALB's network interfaces, allowing traffic to flow through the AWS backbone without traversing the internet. When a client sends a request via a VPC endpoint, the ALB forwards it to targets with the original client IP preserved in the X-Forwarded-For header, but the source IP in the IP packet is the ALB's private IP—true source IP preservation requires the ALB to be configured with 'preserve_client_ip' enabled (supported only for internal ALBs). In a multi-region setup, Route 53 latency-based routing evaluates health checks and latency measurements to route traffic to the closest healthy VPC endpoint, ensuring optimal performance and fault tolerance.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy an internal ALB in each region. Place targets in private subnets. Use VPC endpoints for the ALB (AWS PrivateLink) and Route 53 latency-based routing to the VPC endpoint. — Option B is correct because an internal ALB with targets in private subnets ensures traffic stays within AWS and preserves the client source IP by using VPC endpoints (AWS PrivateLink). Route 53 latency-based routing directs traffic to the closest healthy VPC endpoint, meeting the multi-region distribution requirement while maintaining source IP transparency for backend targets.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on ANS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company has deployed an application across multiple AWS Regions using Application Load Balancers (ALBs). The company wants to route traffic to the nearest healthy endpoint using latency-based routing. Which AWS service should be used to distribute traffic across the ALBs?
medium- A.Amazon CloudFront with multiple origins.
- B.AWS Network Load Balancer with cross-zone load balancing.
- ✓ C.Amazon Route 53 with latency routing policy.
- D.AWS Global Accelerator.
Why C: Option A is correct because Amazon Route 53 supports latency-based routing policies to route traffic to the endpoint with the lowest latency. Option B is wrong because AWS Global Accelerator uses Anycast IPs and directs traffic to the nearest edge location, not necessarily latency-based routing. Option C is wrong because CloudFront is a CDN and not designed for routing to ALBs based on latency. Option D is wrong because Network Load Balancer is a regional service and does not route across regions.
Last reviewed: Jun 11, 2026
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.
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