AWS Certified Solutions Architect - Professional
  • AWS Certified Solutions Architect - Professional
  • Accounts & Permissions
    • AWS Organizations
    • Service Control Policies
    • Security Token Service
    • Permissions Boundaries
    • Permissions Evaluation
    • AWS Resource Access Manager
    • Service Quotas
  • ADVANCED IDENTITIES & FEDERATION
    • SAML2.0 Identity Federation
    • IAM Identity Center
    • Amazon Cognito
    • Amazon Workspaces
    • Directory Service
    • AWS Control Tower
  • NETWORKING & HYBRID
    • Private and Public AWS Services
    • DHCP In a VPC
    • VPC Router
    • Stateful vs Stateless Firewalls
    • Network Access Control Lists
    • Security Groups
    • AWS Local Zones
    • Border Gateway Protocol
    • AWS Global Accelerator
    • IPSec VPN
    • Site2Site VPN
    • Transit Gateway
    • VPC Routing
    • Accelerated Site-to-Site VPN
    • AWS Client VPN
Powered by GitBook
On this page
  1. NETWORKING & HYBRID

Transit Gateway

  • A network gateway that simplifies VPC, VPN, and Direct Connect networking.

  • Eliminates complex peering connections between multiple VPCs.

  • Supports transitive routing, meaning traffic can flow through TGW between networks.

🔗 TGW Connectivity Features

  • Peers VPCs:

    • Same account or different accounts.

    • Same region or across different regions (Inter-Region Peering).

  • Connects:

    • VPCs

    • VPNs (Customer Gateway)

    • Direct Connect (Private connections to AWS)

🛣️ TGW Routing & Isolation

  • TGW Route Tables (TGW RTs) control how traffic moves across attached networks.

  • Routing Isolation via Route Tables:

    • Associations: Each attachment (VPC, VPN, DX) is linked to one TGW route table.

    • Propagation: Determines which TGW route tables learn about an attachment’s routes.

    • By customizing RTs & propagation, you can isolate networks (e.g., keep Prod & Dev separate).

🧠 Quick Summary

Feature
Description

Purpose

Central hub for VPC, VPN, and Direct Connect networking

Peering Support

Works across accounts & regions

Transitive Routing

Yes, enables traffic between connected networks

Route Table Association

Attachments must be linked to a TGW route table

Route Propagation

Controls which routes are shared across TGW route tables

Routing Isolation

Use separate route tables for network segmentation

Last updated 4 hours ago