Core concept
Attach VPCs (via subnets), VPN connections, DX gateway. Route tables control what talks to what.
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How it works
$0.05/hr + $0.02/GB. More expensive than peering per pair, but simpler at N VPCs.
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Trade-offs + gotchas
>5-10 VPCs. Multi-account architectures. Central egress. Hybrid networks. Enterprises.