An intrusion detection system (IDS) and anintrusion prevention system (IPS) are common tools in a secure network. In an on-premise environment, they are not so easy or cheap to implement, because you need dedicated hardware, and also a network structure that accommodates this feature. By contrast, inAWS, using only one feature of the VPC service, you can enable and disable these tools whenever and wherever you consider appropriate. You can have these tools at three levels of your network:
The VPC level
The subnet level
The elastic network interface (ENI) level
As you know, a network interface belongs to one subnet, and one subnet belongs to a VPC. So, if you enable tools at the subnet level, you don't have to apply them ...
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