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here's a whitepaper talking about connectivity options for VPC : https://d1.awsstatic.com/whitepapers/aws-amazon-vpc-connectivity-options.pdf
In general, VPN requires less effort to set up while DirectConnect(DX) requires more effort cause you need to deal with physical links.
Technically, 3 things you shall consider while comparing connectivity options: performance, resilience and cost.
- Performance: DX offers guaranteed performance while VPN more depends on customers Internet link quality
- Resilience: both DX and VPN requires redundancy to ensure the resilience
- Cost: VPN's initial setup cost is less than DX, but there is a difference on DataTransfer, $0.09 per GB data transfer out for VPN and $0.2 to $0.3 per GB data transfer out for DX. So, DX could be cheaper if the data transfer volume is considerable, again this need to studied case by case.
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Hi I think you may refer to the price as $0.02 to $0.03