GCP Professional Cloud Architect Practice Question

Your private data center sits 50 km from Google's Chicago colocation. You need to connect it to a new VPC in us-central1 for a latency-sensitive analytics platform that exchanges about 8 Gbps and permits less than 5 ms latency variation. Traffic cannot traverse the public internet, the link must offer at least 99.9 % availability, be live within four weeks, and keep ongoing costs low. Which hybrid connectivity option best meets these requirements?

Establish two High Availability Cloud VPN tunnels between on-premises routers and separate Cloud VPN gateways in us-central1, exchanging routes with BGP.
Order two 10 Gbps Dedicated Interconnect circuits at the Chicago colocation and configure redundant VLAN attachments with Cloud Router.
Request a single 100 Gbps Dedicated Interconnect circuit at the colocation facility and advertise on-premises routes with static routing.
Provision two 5 Gbps Partner Interconnect VLAN attachments through a supported service provider in the Chicago metro, each in a different edge availability domain, and peer with Cloud Router.

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Answer Description

Partner Interconnect provides private connectivity that avoids the public internet, satisfying compliance requirements and typically provisioning faster than Dedicated Interconnect because the service provider already has capacity. Ordering two 5 Gbps VLAN attachments in the same metro but different edge availability domains and advertising routes with Cloud Router supplies roughly 10 Gbps aggregate bandwidth, maintains low latency, and qualifies for the 99.99 % SLA-exceeding the 99.9 % mandate-at lower recurring cost than Dedicated Interconnect. Cloud VPN is eliminated because it rides the public internet and cannot assure the latency target. Dual 10 Gbps Dedicated Interconnect circuits meet the technical needs but are more expensive and may exceed the four-week lead time. A single 100 Gbps Dedicated Interconnect lacks path redundancy and therefore fails to achieve the required availability SLA. Therefore, dual 5 Gbps Partner Interconnect attachments are the most appropriate choice.

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