ANS-C01 Network Implementation Practice Question
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?
⚠ Common exam trap
A common mix-up: candidates 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.
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.
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.
- ✗
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.
Why it's wrong here
Transit VIFs require different BGP ASNs if not using Direct Connect gateway.
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