So far we have learnt a lot about EC2, its features, and uses, and how we can deploy scalable and fault tolerant applications using it, but EC2 does come with its own sets of minor drawbacks. For starters, you do not control the IP addressing of your instances, apart from adding an Elastic IP address to your instance. By design, each of your instances will get a single private and public IP address, which is routable on the Internet—again, something you cannot control. Also, EC2 security groups have the capability to add rules for inbound traffic only; there is no support for providing any outbound traffic rules. So, although EC2 is good for hosting your applications, it is still not that secure. The answer to all your problems is Amazon VPC!
Amazon VPC is a logically isolated part of the AWS cloud that enables you to build and use your own logical subnets and networks. In a simpler sense, you get to build your own network topology and spin up instances within it...