GCP Professional Cloud Security Engineer Practice Question

A financial services firm must replicate transaction data in real time from its New Jersey data center to a Google Cloud deployment in us-east1. The replication peaks at 18 Gbps and cannot traverse the public internet to satisfy regulatory controls. Latency should be minimized, and the data is already encrypted at the application layer, so link-level encryption is unnecessary. Which connectivity option meets these requirements while avoiding unnecessary cost and complexity?

Set up an HA VPN with four VPN tunnels over dual internet service providers to achieve 18 Gbps of encrypted bandwidth.
Order a single 100-Gbps Dedicated Interconnect circuit and enable MACsec encryption on the link.
Purchase two 10-Gbps Partner Interconnect VLAN attachments from different service providers and protect traffic with HA VPN over the links.
Provision two 10-Gbps Dedicated Interconnect connections in separate metropolitan zones and use them without additional VPN or MACsec encryption.

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Answer Description

The firm requires (1) at least 18 Gbps of throughput, (2) a private path that stays off the public internet, and (3) minimal latency without additional encryption overhead. Two physically diverse 10-Gbps Dedicated Interconnect circuits deliver an aggregate 20 Gbps, meet the 99.9 % availability SLA, and avoid the extra equipment and operational overhead of VPN or MACsec. HA VPN alone traverses the internet, violating the requirement. A 100-Gbps Dedicated Interconnect with MACsec far exceeds bandwidth needs and adds cost and configuration effort. Partner Interconnect adds a service-provider middle-mile that can introduce additional latency and operational dependency, and layering HA VPN adds complexity not needed for already-encrypted data. Therefore, redundant 10-Gbps Dedicated Interconnect circuits are the most appropriate and cost-effective choice.

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