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Answer: 1. Configure your VPC routing in global mode. 2. Add an additional Cloud Interconnect VLAN attachment in the us-west2 region, and configure a Cloud Router in us-west2.
The goal is to ensure high availability across regions in a cost-effective manner. The existing setup has a single VLAN attachment in us-east1. To handle region failures, the solution must provide redundant interconnects in different regions. 1. **Global Routing Mode**: Configuring the VPC in global routing mode ensures that routes propagate across all regions, allowing traffic to use any available interconnect regardless of region. 2. **Redundant Interconnect in Another Region**: Adding a VLAN attachment in us-west2 (a different region) ensures that if us-east1 goes down, the interconnect in us-west2 maintains connectivity. This provides geographic redundancy, which is critical for region-level failures. Option C is correct because it combines global routing (enabling cross-region route propagation) with a new interconnect in us-west2, ensuring connectivity even if us-east1 fails. Other options either rely on redundant interconnects in the same region (which do not address region failures) or use regional routing (which limits route propagation). While adding a new interconnect in us-west2 may incur additional costs, it is necessary to meet the HA requirement for region failures in the most cost-effective way possible under the constraints.
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Your organization has Compute Engine instances deployed in us-east1, us-west2, and us-central1. An existing Cloud Interconnect with a single VLAN attachment and Cloud Router is configured in us-east1 on the East Coast of the United States. You need to design a highly available solution that ensures access to all VPC subnets even if a region fails, while minimizing costs. What is the most effective approach?
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