Google Cloud Professional Cloud Network Engineer — Question 140

You are designing a hub-and-spoke network architecture for your company’s cloud-based environment. You need to make sure that all spokes are peered with the hub. The spokes must use the hub's virtual appliance for internet access. The virtual appliance is configured in high-availability mode with two instances using an internal load balancer with IP address 10.0.0.5. What should you do?

Answer options

• A. 1. Create a default route in the hub VPC that points to IP address 10.0.0.5. 2. Delete the default internet gateway route in the hub VPC, and create a new higher-priority route that is tagged only to the appliances with a next hop of the default internet gateway. 3. Export the custom routes in the hub. 4. Import the custom routes in the spokes.
• B. 1. Create a default route in the hub VPC that points to IP address 10.0.0.5. 2. Delete the default internet gateway route in the hub VPC, and create a new higher-priority route that is tagged only to the appliances with a next hop of the default internet gateway. 3. Export the custom routes in the hub. Import the custom routes in the spokes. 4. Delete the default internet gateway route of the spokes.
• C. 1. Create two default routes in the hub VPC that point to the next hop instances of the virtual appliances. 2. Delete the default internet gateway route in the hub VPC, and create a new higher-priority route that is tagged only to the appliances with a next hop of the default internet gateway. 3. Export the custom routes in the hub. Import the custom routes in the spokes.
• D. 1. Create a default route in the hub VPC that points to IP address 10.0.0.5. 2. Delete the default internet gateway route in the hub VPC, and create a new higher-priority route that is tagged only to the appliances with a next hop of the default internet gateway. 3. Create a new route in the spoke VPC that points to IP address 10.0.0.5.

Correct answer: B

Explanation

The correct answer is B because it ensures that the spokes have the proper routing to utilize the hub's virtual appliance for internet access, including the vital step of deleting the spokes' default internet gateway route. Options A, C, and D do not include the critical step of deleting the default internet gateway route from the spokes, which is necessary for proper internet access configuration through the hub's appliance.