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Question 178 - Professional Cloud Network Engineer discussion

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Your multi-region VPC has had a long-standing HA VPN configured in 'region 1' connected to your corporate network. You are planning to add two 10 Gbps Dedicated Interconnect connections and VLAN attachments in 'region 2' to connect to the same corporate network. You need to plan for connectivity between your VPC and corporate network to ensure that traffic uses the Dedicated Interconnect connections as the primary path and the HA VPN as the secondary path. What should you do?

A.

Enable regional dynamic routing mode on the VPC. Configure BGP associated with the HA VPN in 'region 1' to use a base priority value of 100. Configure BGP associated with the VLAN attachments to use a base priority of 20000. Configure your on-premises routers to use similar multi-exit discriminator (MED) values.

Answers
A.

Enable regional dynamic routing mode on the VPC. Configure BGP associated with the HA VPN in 'region 1' to use a base priority value of 100. Configure BGP associated with the VLAN attachments to use a base priority of 20000. Configure your on-premises routers to use similar multi-exit discriminator (MED) values.

B.

Enable global dynamic routing mode on the VPC. Configure BGP associated with the HA VPN in 'region 1' to use a base priority value of 100. Configure BGP associated with the VLAN attachments to use a base priority of 20000. Configure your on-premises routers to use similar multi-exit discriminator (MED) values.

Answers
B.

Enable global dynamic routing mode on the VPC. Configure BGP associated with the HA VPN in 'region 1' to use a base priority value of 100. Configure BGP associated with the VLAN attachments to use a base priority of 20000. Configure your on-premises routers to use similar multi-exit discriminator (MED) values.

C.

Enable regional dynamic routing mode on the VPC. Configure BGP associated with the HA VPN in 'region 1' to use a base priority value of 20000. Configure BGP associated with the VLAN attachments to use a base priority of 100. Configure your on-premises routers to use similar multi-exit discriminator (MED) values.

Answers
C.

Enable regional dynamic routing mode on the VPC. Configure BGP associated with the HA VPN in 'region 1' to use a base priority value of 20000. Configure BGP associated with the VLAN attachments to use a base priority of 100. Configure your on-premises routers to use similar multi-exit discriminator (MED) values.

D.

Enable global dynamic routing mode on the VPC. Configure BGP associated with the HA VPN in 'region 1' to use a base priority value of 20000. Configure BGP associated with the VLAN attachments to use a base priority of 100. Configure your on-premises routers to use similar multi-exit discriminator (MED) values.

Answers
D.

Enable global dynamic routing mode on the VPC. Configure BGP associated with the HA VPN in 'region 1' to use a base priority value of 20000. Configure BGP associated with the VLAN attachments to use a base priority of 100. Configure your on-premises routers to use similar multi-exit discriminator (MED) values.

Suggested answer: B

Explanation:

For the Dedicated Interconnect to be the primary connection over the HA VPN, you should:

Enable global dynamic routing mode to allow the VPC to distribute routes dynamically across regions.

Set the BGP priority for the VLAN attachments associated with the Dedicated Interconnect to a lower base priority (e.g., 100) than the HA VPN's priority (e.g., 20000) to ensure it is preferred.

Setting up global dynamic routing with adjusted BGP priorities on both Interconnect and VPN will allow dynamic routing of traffic based on set preferences and path attributes, such as MED and priority levels. This setup ensures the Dedicated Interconnect, with a lower priority value, becomes the primary path for traffic, while the HA VPN, with a higher priority, serves as a backup.

asked 19/10/2024
Derrick Dave T Alvarez
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