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Difficulty: MediumDesigning Network Architecture and Hybrid Connectivity

A multinational retail enterprise is designing hybrid connectivity between its on-premises data centers in two distinct metropolitan areas and a primary Google Cloud Virtual Private Cloud (VPC). The architecture requires a sustained peak throughput of 15 Gbps and an enterprise availability SLA of 99.99%. Additionally, the network engineering team intends to peer the primary VPC with a vendor's VPC using VPC Network Peering and expects on-premises hosts to route through the primary VPC into the vendor VPC. Which network architecture should a Cloud Architect recommend?

  1. Provision a 99.99% SLA Dedicated Interconnect topology with four VLAN attachments across two metropolitan areas using Cloud Routers, and establish direct connectivity to the vendor network because VPC Network Peering is non-transitive.Answer
  2. B
    Deploy multiple High Availability (HA) Cloud VPN tunnels with Cloud Routers across both regions to meet the 99.99% SLA, and configure custom route exchange to allow on-premises traffic to transit the peered VPC network.
  3. C
    Provision a 99.99% SLA Dedicated Interconnect topology across two metropolitan areas, and rely on standard VPC Network Peering to automatically transit on-premises traffic through the primary VPC to the vendor VPC.
  4. D
    Establish a single 100 Gbps Partner Interconnect circuit backed up by an HA VPN tunnel, and configure Cloud Router to export local network routes dynamically across the peered VPC connection.

Answer

The architect should recommend provisioning a 99.99% SLA Dedicated Interconnect topology with four VLAN attachments across two metropolitan areas using Cloud Routers, and establishing direct hybrid connectivity to the vendor network.
The correct recommendation is to provision a 99.99% SLA Dedicated Interconnect topology using four VLAN attachments across two metros/edge domains with Cloud Routers, while establishing separate direct connectivity to the vendor network. Dedicated Interconnect handles 15 Gbps bandwidth effortlessly with enterprise SLA coverage, and direct connectivity to the vendor is necessary because VPC Network Peering is non-transitive and cannot forward on-premises traffic across peered VPCs.

Step-by-Step Solution

1
Evaluate bandwidth and SLA constraints for hybrid connectivity.
A 15 Gbps sustained throughput requirement exceeds practical HA VPN tunnel scaling and requires Dedicated Interconnect (available in 10 Gbps or 100 Gbps circuits). For a 99.99% availability SLA, Google Cloud mandates four VLAN attachments across two edge availability domains in two distinct metropolitan locations.
Dedicated Interconnect provides enterprise-grade low-latency high-bandwidth connectivity and official 99.99% SLA topologies.
2
Analyze cross-network routing through VPC Network Peering.
VPC Network Peering is strictly non-transitive. On-premises networks connected to the primary VPC via Interconnect cannot reach resources in a peered partner VPC through the primary VPC.
To connect on-premises to the vendor VPC, a separate hybrid connection, Network Connectivity Center, or VPN/Interconnect directly to the vendor environment must be established.

Key Concept

Dedicated Interconnect 99.99% Availability Architecture & VPC Peering Non-Transitivity
Estimated Time:2m 0s
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Topics

Designing Network Architecture and Hybrid Connectivity