Question

Difficulty: MediumDesigning Infrastructure for Business Requirements and Cost Optimization

A pharmaceutical research enterprise needs to establish hybrid network connectivity between its primary on-premises data center and a Google Cloud Virtual Private Cloud (VPC). The application architecture requires continuous, low-latency data transfers for heavy genomic datasets with a baseline bandwidth requirement of 15 Gbps. The enterprise mandates minimizing recurring networking costs while satisfying bandwidth and SLA requirements. Which hybrid connectivity solution should the cloud architect recommend?

  1. Provision a Dedicated Interconnect connection using 10 Gbps circuits to accommodate the high throughput requirement with direct private connectivity.Answer
  2. B
    Configure multiple High Availability (HA) VPN gateways with Cloud Router and use Equal-Cost Multi-Path (ECMP) routing to aggregate throughput up to 15 Gbps.
  3. C
    Order a Google Cloud Transfer Appliance to physically transport the daily dataset backups from the on-premises facility to Cloud Storage.
  4. D
    Deploy a Cloud Spanner instance with multi-region replication to synchronize database state directly across on-premises servers and Google Cloud over the public internet.

Answer

Provisioning a Dedicated Interconnect connection using 10 Gbps circuits is the recommended solution. It provides direct, private, high-bandwidth connectivity designed for sustained data transfers exceeding 10 Gbps, minimizing per-gigabyte network egress costs and operational complexity.
Dedicated Interconnect provides private, high-speed physical connectivity directly into Google Cloud. For continuous workloads requiring more than 10 Gbps bandwidth (such as 15 Gbps), Dedicated Interconnect with 10 Gbps links is the most cost-effective and architecturally sound approach, providing lower egress bandwidth rates and predictable performance.

Step-by-Step Solution

1
Evaluate throughput requirements
The baseline bandwidth requirement is 15 Gbps continuous throughput.
HA VPN tunnels max out at 3 Gbps per tunnel, making VPN aggregation inefficient for bandwidth demands exceeding 10 Gbps.
2
Compare hybrid connectivity options on Google Cloud
Dedicated Interconnect offers 10 Gbps or 100 Gbps physical links with lower egress rates for heavy sustained traffic.
Dedicated Interconnect is the standard choice when bandwidth exceeds 10 Gbps and low latency/high reliability is required.
3
Select the cost-optimized architecture matching business requirements
Dedicated Interconnect delivers necessary throughput while maintaining cost-efficiency over public internet VPN alternatives.
Direct interconnect physical links avoid high VPN tunnel count overhead and offer lower per-GB transfer costs for large dataset transfers.

Key Concept

Selecting cost-effective hybrid network architecture based on bandwidth thresholds and latency requirements.
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