AWS Transit Gateway

Regional hub-and-spoke routing for many VPCs, VPNs, and supported hybrid network attachments.

Key points

Transit Gateway reduces a large peering mesh and centralizes route-domain design.
Separate route tables can segment attachments; security controls still authorize traffic at workloads and inspection points.
Attachments and processed traffic add cost dimensions, so small topologies may remain simpler with peering.

Best-known use cases

Connect many VPCs and data centers through a hub.
Centralize inspection or routing domains across accounts.

What candidates often confuse it with

Transit Gateway provides transitive hub routing; VPC peering provides direct non-transitive links.
Transit Gateway connects networks; PrivateLink exposes a specific service.

Key takeaway

Choose Transit Gateway when topology scale and central routing outweigh direct-peering simplicity.

Related services

Amazon VPC
AWS Direct Connect
AWS Site-to-Site VPN
AWS Resource Access Manager (AWS RAM)

Relevant exam tasks

D3.4
D4.4

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AWS Transit Gateway

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SAA-C03 at a glance

Category: Associate
Duration: 130 minutes
Questions: 65 total; 50 scored and 15 unidentified unscored
Formats: Multiple choice and multiple response
Scoring: 100–1,000 scaled score; 720 minimum passing score

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