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Difficulty: MediumDesigning Network Architecture and Hybrid Connectivity

An online gaming platform is designing a hybrid network architecture to connect its on-premises match-making datacenter to two separate Google Cloud VPC networks: `vpc-game-prod` (hosting game servers) and `vpc-analytics` (hosting telemetry pipelines). The architecture must meet the following technical requirements:
- Baseline hybrid bandwidth demand is 6 Gbps continuously with high SLA requirements (99.99% availability).
- Both VPC networks are connected to each other using VPC Network Peering.
- On-premises hosts must reach both `vpc-game-prod` and `vpc-analytics` directly without attempting to route traffic transitively through VPC Peering.

Which TWO architectural decisions must be implemented to fulfill these requirements? (Select TWO)

  1. Provision Dedicated Interconnect connections with separate VLAN attachments configured on Cloud Routers in both `vpc-game-prod` and `vpc-analytics`.Answer
  2. Provision four Dedicated Interconnect circuits deployed across two separate colocation facilities (metros) with redundant Cloud Routers in each region.Answer
  3. C
    Configure static route exports in `vpc-game-prod` to relay on-premises traffic to `vpc-analytics` over the existing VPC Network Peering connection.
  4. D
    Deploy HA VPN gateways with four active IPsec tunnels to carry the 6 Gbps baseline traffic requirement to Google Cloud.

Answer

The correct architecture requires provisioning Dedicated Interconnect connections directly into both `vpc-game-prod` and `vpc-analytics` to handle non-transitive VPC Peering limits, and deploying four Dedicated Interconnect circuits across two metro locations to meet the 99.99% availability SLA.
To achieve 99.99% availability for hybrid connectivity with a 6 Gbps baseline requirement, GCP guidelines mandate deploying Dedicated Interconnect across two distinct metro locations with four total connections. Additionally, because VPC Network Peering is strictly non-transitive, hybrid connectivity must be provisioned with Cloud Routers and VLAN attachments in both VPC networks so on-premises traffic can directly access each VPC.

Step-by-Step Solution

1
Evaluate throughput and SLA constraints
A 6 Gbps continuous throughput requirement with 99.99% availability mandates Dedicated Interconnect with 4 connections across 2 metro locations.
Dedicated Interconnect provides 10 Gbps or 100 Gbps physical circuits. Achieving a 99.99% SLA requires 4 VLAN attachments across 2 distinct metro colocation facilities.
2
Evaluate VPC Peering routing capabilities
VPC Peering does not support transitive routing.
On-premises resources cannot reach `vpc-analytics` by routing through `vpc-game-prod` over VPC Peering. Therefore, hybrid interconnect connections must be terminated into both VPC networks.

Key Concept

Designing 99.99% SLA Dedicated Interconnect topologies and addressing VPC Network Peering non-transitivity.
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Topics

Designing Network Architecture and Hybrid Connectivity