A security group in AWS manages traffic to and from an EC2 instance using a set of inbound and outbound rules. This indicates it defines instance-level security. An inbound rule, for example, may permit traffic from a single IP address to access the instance, whereas an outbound rule may permit all traffic to leave the instance. Because security groups operate at the VPC instance level, each security group can be applied to one or more instances, also through subnets Furthermore, each instance must be linked to one or more security groups.

Amazon VPC (Virtual Private Cloud) enables users to initiate AWS resources within the user-defined virtual network. Each VPC you create is fully customizable and logically isolated from other virtual networks in the AWS cloud. You can configure the IP address range, create subnets, configure root tables, customize network gateways, and define security settings with security groups and network access control lists. Other AWS resources, such as Amazon EC2 instances, can be launched using VPC.

The network infrastructure of Amazon Web Services (AWS) can be complicated. Structuring VPCs and instances requires tactical planning whether it's using a content delivery network (CDN), a network optimizer, or dynamic content accelerators. Using Elastic IPs in AWS can help you optimize your infrastructure and implement modifications more easily. With Elastic IPs, you'll need a quick and easy way to modify your setup as your environment and business need change.

Understanding the URI Parameter and Query Parameter How many times have you wondered whether to use query parameter or URI parameter when designing an API. Lets understand the difference. As an API developer, you would have designed an API to get a collection of resource, filter the resource or do some action on an instance resource. It is important to understand when to use a query parameter and uri parameter. They both serve different purpose.

Confused whether to use PUT or PATCH or POST in your API? Don't worry you are not alone and this is a common confusion which happens to most of us or to all of us at some point while developing our API. Before we understand the difference between PUT vs PATCH vs POST, first we need to understand Idempotency.