Google Cloud Professional Cloud Network Engineer — Question 209

You are implementing hybrid connectivity between your company's data center and Google Cloud. You've already deployed redundant Dedicated Interconnect connections, and are now deploying VLAN attachments in us-central1. You want to use an active/passive approach, where interconnect-1 is active and interconnect-2 is a passive backup. You need to deploy a Cloud Router to enable BGP connectivity. You want to follow Google-recommended practices. What should you do?

Answer options

• A. 1. Configure the primary interconnect-1 BGP session on the Cloud Router with priority 0 and ASN 65101. 2. Configure the secondary interconnect-2 BGP session on the Cloud Router with priority 200 and ASN 65102. 3. Configure the on-premises ASN as 65000.
• B. 1. Configure the primary interconnect-1 BGP session on the Cloud Router with priority 0. 2. Configure the secondary interconnect-2 BGP session on the Cloud Router with priority 200. 3. Configure both Google-side BGP ASNs as 65100. 4. Configure the on-premises ASN as 65000.
• C. 1. Configure the primary and secondary interconnects of the BGP sessions on the Cloud Router with priority 100 and ASN 16550. 2. Configure the on-premises ASN as 65001 for primary interconnect-1. 3. Configure the on-premises ASN as 65002 for secondary interconnect-2.
• D. 1. Configure the primary and secondary interconnects of the BGP sessions on the Cloud Router with priority 100 and ASN 4200000001. 2. Configure the on-premises ASN as 4200000010. 3. Disable the BGP session on the on-premises router for the secondary interconnect-2.

Correct answer: B

Explanation

The correct answer, B, specifies the right priorities for the BGP sessions and the necessary configuration for Google-side ASNs, which aligns with Google’s best practices. Options A, C, and D either misconfigure the BGP session priorities or the ASNs, leading to potential connectivity issues. Prioritizing the primary connection with a lower value ensures it is used actively, while the secondary connection remains a backup.