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Multi-cloud Terminology

Network Connectivity

CSP Network Private Connection Gateway
Amazon Virtual Private Network (VPC) Direct Connect Transit Gateway (TGW)
Virtual Private Gateway
Direct Connect Gateway
Azure Virtual Network (VNet) ExpressRoute VNet Gateway
Google Virtual Private Cloud (VPC) Interconnect Cloud Router
Oracle Virtual Cloud Network (VCN) FastConnect Dynamic Routing Gateway (DRG)

Networking Scopes

AWS

  • VPC: Global scope within a region
  • Availability Zone (AZ): A single data centre within a region
  • Subnet: Confined to a single AZ

Azure

  • Virtual Network (VNet): Regional scope (spans the whole region)
  • Availability Zone (AZ): Not tied to subnets; subnets span the whole region
  • Subnet: Exists within a VNet but spans the region

GCP

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  • VPC: Global scope across multiple regions
  • Region: Contains multiple zones
  • Subnet: Regional scope (can span multiple zones)

OCI

  • Virtual Cloud Network (VCN): Similar to AWS VPC, but confined to a single region
  • Availability Domain (AD): Equivalent to AWS Availability Zones; a region may have multiple ADs
  • Subnet Scope: OCI offers both regional and AD-specific subnets
    • Regional Subnets: Span the entire region (similar to GCP)
    • AD-specific Subnets: Confined to a single Availability Domain