AWS Direct Connect establishes a dedicated private circuit from your on-premises network to AWS. You can create a private virtual interface that maps directly into an Amazon VPC, giving predictable latency and higher throughput while bypassing the public internet.
AWS Site-to-Site VPN transmits traffic across the public internet in an encrypted tunnel, so it cannot guarantee the same consistency or bandwidth as a dedicated circuit.
AWS PrivateLink keeps traffic on the AWS network but is used to expose services privately across VPCs rather than to connect a physical data center.
AWS Global Accelerator optimizes routing for user traffic on the internet but does not provide a private, dedicated circuit from on-premises to AWS.
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