GoogleGoogle Professional Cloud Network Engineer (PCNE) Certification·EN·Updated 22 Aug 2026
Design VLAN attachments and Cloud Router placement for Dedicated Interconnect to a Shared VPC to meet Google’s 99.9% Cloud Interconnect SLA. What should you do?
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Correct answer: Create two Dedicated Interconnect connections in different edge availability domains of the colocation facility in the project that holds your connections. Create one VLAN attachment per physical interconnect and a single Cloud Router in the Shared VPC host project..
Why this is the answer
To meet the 99.9% SLA, you need redundant Dedicated Interconnects in different edge availability domains within the same colocation facility. This provides high availability for the physical connections. For Shared VPC, VLAN attachments and Cloud Routers must reside in the host project. Creating one VLAN attachment per physical interconnect ensures each connection has its own logical path. A single Cloud Router in the host project can manage BGP sessions for both VLAN attachments, simplifying configuration and centralizing routing for all service projects attached to the Shared VPC. Placing VLAN attachments or Cloud Routers in service projects is incorrect because Interconnect resources are managed at the host project level in Shared VPC.