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Difficulty: MediumDesigning Infrastructure for Business Requirements and Cost Optimization

A financial analytics company needs to establish continuous hybrid connectivity between its primary on-premises data center and a Google Cloud VPC to stream real-time market data. The network architecture requires a guaranteed, sustained bandwidth of 15 Gbps15\text{ Gbps}. The company's on-premises facility is directly colocated in a facility housing a Google Cloud Interconnect location. The primary business requirement is to minimize ongoing monthly network infrastructure costs while reliably satisfying the throughput requirement. Which hybrid networking architecture should the cloud architect recommend?

  1. Provision two 10 Gbps Dedicated Interconnect connections to satisfy the 15 Gbps bandwidth requirement.Answer
  2. B
    Deploy six High Availability (HA) Cloud VPN tunnels with dynamic BGP routing to aggregate bandwidth over the public internet.
  3. C
    Order a Google Cloud Transfer Appliance to physically transport the daily dataset on an ongoing schedule.
  4. D
    Provision a single 100 Gbps Dedicated Interconnect connection and apply a 3-year Committed Use Discount.

Answer

Provision two 10 Gbps Dedicated Interconnect connections to satisfy the 15 Gbps bandwidth requirement.
Dedicated Interconnect provides direct physical connections between an on-premises network and Google Cloud VPC. For workloads requiring sustained bandwidth above 3 Gbps3\text{ Gbps} up to several tens of Gbps, provisioning multiple 10 Gbps10\text{ Gbps} Dedicated Interconnect links offers the lowest cost per Gbps and lower egress data fees compared to VPN solutions or over-provisioned 100 Gbps100\text{ Gbps} links.

Step-by-Step Solution

1
Analyze the bandwidth requirement
The application demands a sustained throughput of 15 Gbps15\text{ Gbps}.
HA VPN tunnels max out at 3 Gbps3\text{ Gbps} per tunnel and are unsuited for high sustained throughput requirements.
2
Evaluate direct physical connectivity options for cost efficiency
Since the facility is colocated with a Google Cloud Interconnect location, Dedicated Interconnect is available in 10 Gbps10\text{ Gbps} and 100 Gbps100\text{ Gbps} increments.
Dedicated Interconnect offers lower egress data rates and higher reliability for heavy bandwidth workloads.
3
Calculate the optimal capacity to minimize monthly operational cost
Two 10 Gbps10\text{ Gbps} Dedicated Interconnect links provide 20 Gbps20\text{ Gbps} total capacity, meeting the 15 Gbps15\text{ Gbps} target cost-effectively without the steep baseline cost of a 100 Gbps100\text{ Gbps} port.
Matching capacity closely to business requirements avoids unnecessary over-provisioning costs.

Key Concept

Designing hybrid network connectivity based on throughput thresholds and cost optimization principles.
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Topics

Designing Infrastructure for Business Requirements and Cost Optimization