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Question 1,080 of 1,705

Network Management and Operations →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is a Global Accelerator endpoint weight misconfiguration, which causes European traffic to be routed to the us-east-1 endpoint instead of the closer eu-west-1 endpoint. This occurs because Global Accelerator uses anycast static IPs and traffic distribution is governed by endpoint weights; if the eu-west-1 endpoint is assigned a lower weight or is misconfigured, the accelerator may send a disproportionate share of European requests to the higher-weighted us-east-1 endpoint, introducing unnecessary latency and buffering. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how Global Accelerator’s traffic dials and endpoint weights interact with geographic proximity—a common trap is assuming health checks alone guarantee optimal routing, when weight misconfiguration can override latency-based steering. Remember the mnemonic: “Weight wins over proximity”—always verify that endpoint weights are balanced to match regional capacity and user distribution.

ANS-C01 Network Management and Operations Practice Question

This ANS-C01 practice question tests your understanding of network management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 media company streams live video to viewers worldwide. The application runs on EC2 instances behind an Application Load Balancer in two AWS regions, us-east-1 and eu-west-1. The company uses Amazon CloudFront as a CDN with origins pointing to both regional ALBs. The network team recently deployed AWS Global Accelerator to improve performance by directing traffic to the nearest healthy endpoint. However, after enabling Global Accelerator, viewers in Europe report buffering issues, while viewers in the US have no issues. The team has verified that the Global Accelerator endpoints are healthy and the ALBs are functioning correctly. The application uses a custom domain name. The DNS is managed by Route 53. What is the most likely cause of the buffering issues for European viewers?

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.

Question 1hardmultiple choice

Read the full DNS explanation →

A
Global Accelerator is directing European traffic to the us-east-1 endpoint due to endpoint weight misconfiguration.
If weights are not set to distribute traffic, all traffic may go to one region.
B
The Route 53 DNS record is not pointing to Global Accelerator but to CloudFront, bypassing Global Accelerator.
Why wrong: If bypassed, Global Accelerator would not cause issues.
C
CloudFront is caching content from the us-east-1 origin only, causing high latency for European viewers.
Why wrong: CloudFront would cache from the nearest origin if configured with both origins.
D
The eu-west-1 ALB is not configured to accept traffic from Global Accelerator IPs.
Why wrong: Global Accelerator uses its own IPs, but ALB security groups should allow them; however, this would cause connection failures, not just buffering.

Full breakdown with real-world context →

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

✓

Global Accelerator is directing European traffic to the us-east-1 endpoint due to endpoint weight misconfiguration.

Option A is correct because Global Accelerator provides static IP addresses that are anycast from edge locations. If viewers' DNS queries resolve to the Global Accelerator DNS name, they get IPs that may route to the us-east-1 endpoint if the eu-west-1 endpoint is not properly configured or weighted, causing high latency. The most common issue is that the DNS resolution for the custom domain points to Global Accelerator, but the routing within Global Accelerator may not be directing European traffic to the eu-west-1 endpoint if the endpoint weights are misconfigured or if one endpoint is unhealthy. Option B is wrong because CloudFront origins are separate; Global Accelerator is used instead of CloudFront? Actually, they use both, but the issue is after enabling Global Accelerator. Option C is wrong because CloudFront would not cause issues when Global Accelerator is used. Option D is wrong because the application is not on-premises.

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.

✓
Global Accelerator is directing European traffic to the us-east-1 endpoint due to endpoint weight misconfiguration.
Why this is correct
If weights are not set to distribute traffic, all traffic may go to one region.
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.
✗
The Route 53 DNS record is not pointing to Global Accelerator but to CloudFront, bypassing Global Accelerator.
Why it's wrong here
If bypassed, Global Accelerator would not cause issues.
✗
CloudFront is caching content from the us-east-1 origin only, causing high latency for European viewers.
Why it's wrong here
CloudFront would cache from the nearest origin if configured with both origins.
✗
The eu-west-1 ALB is not configured to accept traffic from Global Accelerator IPs.
Why it's wrong here
Global Accelerator uses its own IPs, but ALB security groups should allow them; however, this would cause connection failures, not just buffering.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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 ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this ANS-C01 question test?

Network Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Global Accelerator is directing European traffic to the us-east-1 endpoint due to endpoint weight misconfiguration. — Option A is correct because Global Accelerator provides static IP addresses that are anycast from edge locations. If viewers' DNS queries resolve to the Global Accelerator DNS name, they get IPs that may route to the us-east-1 endpoint if the eu-west-1 endpoint is not properly configured or weighted, causing high latency. The most common issue is that the DNS resolution for the custom domain points to Global Accelerator, but the routing within Global Accelerator may not be directing European traffic to the eu-west-1 endpoint if the endpoint weights are misconfigured or if one endpoint is unhealthy. Option B is wrong because CloudFront origins are separate; Global Accelerator is used instead of CloudFront? Actually, they use both, but the issue is after enabling Global Accelerator. Option C is wrong because CloudFront would not cause issues when Global Accelerator is used. Option D is wrong because the application is not on-premises.

What should I do if I get this ANS-C01 question wrong?

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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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 network engineer is designing a multi-region application that requires low-latency traffic between EC2 instances in two different AWS Regions. The engineer needs to ensure that traffic between the instances uses the AWS global network and not the public internet. Which AWS service should be used?

hard

A.AWS Direct Connect
✓ B.AWS Global Accelerator
C.AWS Transit Gateway
D.VPC Peering

Why B: The correct answer is D because VPC Peering does not support inter-region peering unless explicitly enabled, but Global Accelerator uses the AWS global network to route traffic. However, the question asks for low-latency traffic between EC2 instances in different Regions; AWS Transit Gateway does not support inter-region peering by default, and Direct Connect is for on-premises. Option A is wrong because VPC Peering requires explicit inter-region peering and does not provide low-latency optimization. Option B is wrong because Transit Gateway does not natively support inter-region connectivity. Option C is wrong because Direct Connect is for on-premises to AWS. Option D is correct because Global Accelerator routes traffic over the AWS global network.

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