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Networking & Content Delivery

AWS Transit Gateway

"Hub that connects VPCs and on-premises networks."

AWS Transit Gateway

AWS Transit Gateway is a service that connects VPCs and on-premises networks through a central hub. It simplifies your network and puts an end to complex peering relationships.

Key Features

  • Central Hub: Connects thousands of VPCs and on-premises networks.
  • Hub-and-Spoke Topology: Simplifies network architecture (avoids full mesh peering).
  • Multicast: Supports IP multicast.
  • Global: Inter-Region peering allows you to connect Transit Gateways across regions.

Exam Tips

  • "Connects many VPCs": Answer is Transit Gateway.
  • "Hub and spoke": Answer is Transit Gateway.
  • "Simplify peering": Answer is Transit Gateway.
  • "Transitive peering": VPC Peering is non-transitive; Transit Gateway acts as a router to solve this.

Common Use Cases

  • Large Network Architectures: Connecting hundreds of VPCs in a single region.
  • Global Network: Connecting global offices and VPCs.
  • Centralized Inspection: Routing traffic through a central security VPC.
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