The answer is that enabling client IP preservation on Global Accelerator for cross-region endpoints is the most likely cause of the intermittent failures. This is because when client IP preservation is active, Global Accelerator forwards packets with the original client IP address intact to the Application Load Balancers. However, ALBs are layer-7 load balancers that expect traffic to originate from Global Accelerator’s static IP addresses for proper routing, health check responses, and security group handling; the mismatch causes the ALBs to reject or mishandle the traffic. On the ANS-C01 exam, this scenario tests your understanding of how Global Accelerator interacts with regional endpoints, specifically the critical distinction that client IP preservation is supported for regional endpoints like Network Load Balancers but not for cross-region ALB endpoints. A common trap is assuming preservation always improves performance, but here it breaks the ALB’s expected traffic flow. Memory tip: “Preserve the client, lose the route” — when you preserve the client IP across regions, the ALB can’t route back correctly.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 has deployed a web application across multiple AWS Regions using Application Load Balancers (ALBs) and EC2 instances. They want to use AWS Global Accelerator to improve performance and provide a fixed entry point. The Global Accelerator is configured with endpoints pointing to the ALBs. However, users are experiencing intermittent failures. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Client IP address preservation is enabled on the Global Accelerator for cross-Region endpoints.
When client IP address preservation is enabled on Global Accelerator for cross-Region endpoints, the accelerator preserves the original client IP address in the packets sent to the Application Load Balancers. However, ALBs are layer-7 load balancers that require traffic to originate from the Global Accelerator's static IP addresses, not the client's IP, for proper routing and health check responses. This mismatch causes the ALBs to reject or mishandle traffic, leading to intermittent failures.
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.
✓
Client IP address preservation is enabled on the Global Accelerator for cross-Region endpoints.
Why this is correct
When using cross-region endpoints, client IP address preservation must be disabled, otherwise traffic fails.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Global Accelerator does not support multiple endpoints in different Regions.
Why it's wrong here
Global Accelerator supports endpoints in multiple Regions.
✗
The ALBs are not configured with health checks.
Why it's wrong here
Health checks are configured separately and would not cause intermittent failures.
✗
The Global Accelerator is not configured for IPv6 traffic.
Why it's wrong here
Global Accelerator supports both IPv4 and IPv6.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that client IP preservation is always beneficial, but the trap here is that enabling it for ALB endpoints in cross-Region setups breaks the expected traffic flow because ALBs require the source IP to be the Global Accelerator's IPs, not the client's.
Detailed technical explanation
How to think about this question
Global Accelerator uses the Anycast IP addresses from its edge locations to route traffic to the nearest endpoint. When client IP preservation is enabled, the accelerator inserts the client's IP into the packet's source address field, but ALBs expect the source IP to be the accelerator's static IPs for proper session stickiness and security group rules. This can cause the ALB to drop packets or fail health checks, resulting in intermittent connectivity. In practice, client IP preservation should be disabled for ALB endpoints unless the ALB is configured to handle the preserved IPs via proxy protocol or X-Forwarded-For headers.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 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: Client IP address preservation is enabled on the Global Accelerator for cross-Region endpoints. — When client IP address preservation is enabled on Global Accelerator for cross-Region endpoints, the accelerator preserves the original client IP address in the packets sent to the Application Load Balancers. However, ALBs are layer-7 load balancers that require traffic to originate from the Global Accelerator's static IP addresses, not the client's IP, for proper routing and health check responses. This mismatch causes the ALBs to reject or mishandle traffic, leading to intermittent failures.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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