Configure External IP for Load Balancing in Multiple Google Cloud Regions

A.

The best option to distribute new requests to the instance groups in both regions using a single external IP address would be to use a global load balancer. A global load balancer can distribute traffic across multiple regions using a single IP address.

Option A is incorrect because network endpoint groups are used for internal load balancing, not external load balancing. Network endpoint groups are used for load balancing traffic within a VPC network.

Option B is partially correct but not the best option. To expand to a second region, you could add the new instance group to the existing load balancer. However, changing the load balancer frontend configuration to use the Premium Tier network may not be necessary, and it will increase costs. Premium Tier provides lower latency and higher throughput, but it is more expensive than Standard Tier. Additionally, this option does not create a single external IP address to distribute new requests to the instance groups in both regions.

Option C is incorrect because creating a new load balancer in us-east-2 using the Standard Tier network and assigning a static external IP address would not distribute traffic across both regions. It would only distribute traffic to the instance group in us-east-2.

Option D is incorrect because creating a Cloud VPN connection between the two regions and enabling Google Private Access would not distribute traffic across both regions. VPN connections are used for secure communication between VPC networks in different regions or between on-premises networks and VPC networks.

Therefore, the correct answer is B: Change the load balancer frontend configuration to use the Premium Tier network and add the new instance group. However, it is recommended to use a global load balancer instead of a regional load balancer to distribute traffic across multiple regions.