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An Amazon VPC router enables Amazon EC2 instances within subnets to communicate with Amazon EC2 instances in other subnets within the same VPC. The VPC router also enables subnets, Internet gateways, and virtual private gateways to communicate with each other. Network usage data is not available from the router; however, you can obtain network usage statistics from your instances using Amazon CloudWatch.
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This AWS VPC router allows the AWS EC2 instance to connect with another EC2 instance from another subnet but from the same VPC. It also allows subnet, internet gateway, and virtual private gateway to communicate with each other. Note that the network usage data is not available from the router.
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VPC router allows Amazon EC2 instances within subnets to interact with Amazon EC2 instances in other subnets within the same VPC. Virtual private gateways, subnets and Internet gateways, etc. can also communicate with each other by means of a VPC router.
Amazon KMS is a managed service that is integrated with various other AWS Services. You can use it in your applications to create, store and control encryption keys to encrypt your data. Learn AWS KMS Key Management Service.