ANS-C01 Question 344
Select 2Your company has established an AWS hybrid network using AWS Direct Connect to connect your on-premises data center to AWS. To enable dynamic routing and ensure high availability between your on-premises network and your VPC, you are considering using BGP (Border Gateway Protocol). Which of the following configurations are necessary to establish BGP over Direct Connect in this scenario? (Select TWO)
- A
Configure a private virtual interface (VIF) on the Direct Connect connection.
- B
Assign a public ASN (Autonomous System Number) to your on-premises router.
- C
Ensure that both on-premises and AWS routers use the same ASN.
- D
Advertise your on-premises CIDR range through BGP.
- E
Enable static routing on the Direct Connect connection.
Show answer and explanation
Correct answers: A, D
Explanation
To successfully establish BGP over AWS Direct Connect, you need a private virtual interface (VIF) on the Direct Connect connection, which facilitates the communication between your on-premises network and the AWS VPC. Additionally, you must advertise your on-premises CIDR ranges through BGP so that AWS can route traffic destined for your on-premises network. Static routing is not used with BGP, and having the same ASN on both sides is not necessary.
- A. Correct.
Correct. A private virtual interface (VIF) is required to connect your on-premises network to your VPC using AWS Direct Connect and BGP.
- B. Incorrect.
Incorrect. While you can use a public ASN, it is not mandatory. You can use a private ASN for your on-premises router as long as it does not conflict with AWS's default ASN.
- C. Incorrect.
Incorrect. AWS and your on-premises router can have different ASNs. In fact, having different ASNs is a common configuration for BGP peering.
- D. Correct.
Correct. To establish BGP over Direct Connect, you need to advertise your on-premises CIDR ranges so AWS knows which IP ranges are reachable through your on-premises network.
- E. Incorrect.
Incorrect. Static routing is not used when you configure BGP. BGP is a dynamic routing protocol that automatically exchanges route information.