- A
Use a Direct Connect gateway and create a private virtual interface from each region's Direct Connect connection to the Direct Connect gateway. Use the same BGP ASN on AWS side.
Direct Connect gateway allows same ASN across multiple VIFs and regions.
- B
Establish two separate private virtual interfaces from each region to the on-premises router using different BGP ASNs.
Why wrong: Using different ASNs is not desired; the requirement is same ASN.
- C
Use AWS Site-to-Site VPN over the internet as a backup and the Direct Connect as primary.
Why wrong: Does not meet the requirement to use Direct Connect only and same ASN.
- D
Create a transit virtual interface from each region to a Transit Gateway in each region and peer the Transit Gateways.
Why wrong: Transit VIFs require different BGP ASNs if not using Direct Connect gateway.
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 designing a multi-region architecture with two AWS Regions. They need to connect VPCs in each region to an on-premises data center using AWS Direct Connect. They want to minimize latency and use the same BGP ASN on both sides. Which solution meets these requirements?
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 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
Use a Direct Connect gateway and create a private virtual interface from each region's Direct Connect connection to the Direct Connect gateway. Use the same BGP ASN on AWS side.
A Direct Connect gateway allows you to associate private virtual interfaces from multiple regions, enabling a single BGP ASN to be used on the AWS side across all connections. This minimizes latency by providing direct, private connectivity from each region to the on-premises data center without traversing the public internet. The ability to use the same BGP ASN on both sides is supported because the Direct Connect gateway presents itself as a single BGP speaker, avoiding ASN conflicts.
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 a Direct Connect gateway and create a private virtual interface from each region's Direct Connect connection to the Direct Connect gateway. Use the same BGP ASN on AWS side.
Why this is correct
Direct Connect gateway allows same ASN across multiple VIFs and regions.
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.
- ✗
Establish two separate private virtual interfaces from each region to the on-premises router using different BGP ASNs.
Why it's wrong here
Using different ASNs is not desired; the requirement is same ASN.
- ✗
Use AWS Site-to-Site VPN over the internet as a backup and the Direct Connect as primary.
Why it's wrong here
Does not meet the requirement to use Direct Connect only and same ASN.
- ✗
Create a transit virtual interface from each region to a Transit Gateway in each region and peer the Transit Gateways.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a transit virtual interface or Transit Gateway peering is required for multi-region connectivity, but the Direct Connect gateway is specifically designed to aggregate private virtual interfaces from multiple regions while allowing the same BGP ASN on both sides.
Detailed technical explanation
How to think about this question
The Direct Connect gateway acts as a hub that can be associated with private virtual interfaces from multiple AWS Regions, allowing a single BGP session to be established between the on-premises router and the gateway. Under the hood, the gateway uses a unique BGP identifier but allows the same ASN to be configured on the AWS side because it does not perform AS-path prepending in a way that would cause loops; this is compliant with RFC 4271, which permits the same ASN in a path if the BGP speaker is configured to accept it. In a real-world scenario, this simplifies routing policies and reduces the risk of BGP flapping due to ASN mismatch.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: Use a Direct Connect gateway and create a private virtual interface from each region's Direct Connect connection to the Direct Connect gateway. Use the same BGP ASN on AWS side. — A Direct Connect gateway allows you to associate private virtual interfaces from multiple regions, enabling a single BGP ASN to be used on the AWS side across all connections. This minimizes latency by providing direct, private connectivity from each region to the on-premises data center without traversing the public internet. The ability to use the same BGP ASN on both sides is supported because the Direct Connect gateway presents itself as a single BGP speaker, avoiding ASN conflicts.
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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Last reviewed: Jul 4, 2026
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