GCP Professional Cloud Architect Practice Question

Your enterprise runs a latency-sensitive financial analytics platform split between a Google Cloud VPC and an AWS VPC that terminate in the same metropolitan area data-center campus. The application replicates 8-10 Gbps of data continuously from AWS to BigQuery in Google Cloud. The current IPsec VPN tunnels often suffer jitter and unpredictable throughput, causing service-level violations. Security is satisfied as long as traffic remains on the providers' private backbones without traversing the public internet. Which Google-provided connectivity option best meets the throughput and latency requirements while reducing operational overhead?

Replace the existing tunnels with High-Availability Cloud VPN using multiple tunnels across two Cloud VPN gateways.
Deploy Cross-Cloud Interconnect with redundant 10 Gbps VLAN attachments in the shared metro facility and use Cloud Router for dynamic routing.
Create VPC Network Peering between the Google Cloud VPC and the AWS VPC to establish private connectivity over the providers' backbones.
Configure Cloud NAT in the Google Cloud VPC and route replication traffic over the public internet using standard egress.

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Answer Description

Cross-Cloud Interconnect establishes dedicated, private 10 Gbps Ethernet links between Google Cloud and supported third-party cloud providers such as AWS, keeping traffic on the providers' backbones and away from the public internet. By deploying redundant Cross-Cloud Interconnect connections and advertising routes with Cloud Router, you can achieve predictable low latency and qualify for a 99.99 % availability SLA. High-Availability Cloud VPN still relies on the public internet and cannot guarantee consistent 8-10 Gbps throughput. VPC Network Peering only supports peering between Google Cloud VPCs, not external cloud networks. Cloud NAT provides outbound internet access but no private multi-cloud connectivity. Therefore, Cross-Cloud Interconnect with redundant 10 Gbps attachments is the most suitable choice.

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