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As your GCP environment grows beyond a single VPC or project, you need ways to connect VPCs together. GCP offers two primary mechanisms: VPC Network Peering for connecting VPCs across projects or organisations, and Shared VPC for sharing a single VPC across multiple projects within an organisation. Each approach has distinct characteristics, use cases, and trade-offs.
VPC Peering creates a direct network path between two VPC networks, allowing resources in each VPC to communicate using internal IP addresses. Traffic between peered VPCs stays on Google's network — it never traverses the public internet.
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