Google Cloud Professional Cloud Network Engineer — Question 57

After a network change window one of your company's applications stops working. The application uses an on-premises database server that no longer receives any traffic from the application. The database server IP address is 10.2.1.25. You examine the change request, and the only change is that 3 additional VPC subnets were created. The new VPC subnets created are 10.1.0.0/16, 10.2.0.0/16, and 10.3.1.0/24/ The on-premises router is advertising 10.0.0.0/8.
What is the most likely cause of this problem?

Answer options

• A. The less specific VPC subnet route is taking priority.
• B. The more specific VPC subnet route is taking priority.
• C. The on-premises router is not advertising a route for the database server.
• D. A cloud firewall rule that blocks traffic to the on-premises database server was created during the change.

Correct answer: B

Explanation

The correct answer is B because the more specific VPC subnet route (10.2.0.0/16) is taking precedence over the less specific route advertised by the on-premises router. This results in the application being unable to reach the database server at 10.2.1.25, as it falls outside the new routing configuration that prioritizes the more specific VPC routes. The other options do not accurately address the routing issue caused by the newly created subnets.