Google Professional Cloud Network Engineer Question 674
Select 3Google Cloud PlatformYou are configuring a Cloud Router to establish a BGP session with your on-premises router. During the setup, you need to ensure proper connectivity and routing configuration. Which of the following considerations should you account for when configuring the Cloud Router?
- A
Ensure that the Cloud Router and the on-premises router use unique Autonomous System Numbers (ASNs) for BGP.
- B
Configure the Cloud Router to advertise only the routes for subnets within the VPC network.
- C
Verify that the Cloud Router is in the same region as the VPC subnets it manages.
- D
Use the same IP address for both the Cloud Router's interface and the on-premises router interface to simplify configuration.
- E
Ensure that the Cloud Router's interface IP address falls within the same subnet as the on-premises router's interface IP address.
Show answer and explanation
Correct answers: A, C, E
Explanation
When configuring a Cloud Router for BGP, it is critical to ensure unique ASNs for proper BGP sessions, that the Cloud Router is in the same region as the VPC subnets it manages, and that the interface IP addresses of both the Cloud Router and on-premises router are within the same subnet. These considerations ensure proper connectivity and routing functionality. Misconfigurations, such as using the same IP address for interfaces or failing to align subnets, would lead to routing and connectivity issues.
- A. Correct.
This is correct. BGP requires the use of unique ASNs for each router to establish a proper BGP session. Reusing ASNs can cause routing conflicts.
- B. Incorrect.
This is incorrect. While you can configure route advertisements on the Cloud Router, it is not necessary to restrict advertisements only to VPC subnets. It depends on the routing requirements.
- C. Correct.
This is correct. A Cloud Router must be in the same region as the subnets it manages because it interacts with regional resources.
- D. Incorrect.
This is incorrect. Each router must have a unique IP address for its interface in order to establish proper communication. Using the same IP address would cause conflicts.
- E. Correct.
This is correct. The interface IP addresses of the Cloud Router and the on-premises router must be in the same subnet to ensure Layer 3 connectivity between the two.