EC2 Core Concepts

In this lesson, we will go over the Elastic Network Interface, Amazon Machine Image (AMI), the different types of instances offered by EC2 and their use cases, and EC2 user data.

Elastic Network Interface (ENI)

An Elastic Network Interface (ENI), also known as a Network Interface, is a virtual network card that can be attached to the EC2 instances. ENI is a logical networking component that can be used to provide multiple IP addresses or attach an instance to different subnets. An Elastic Network Interface (ENI) in AWS is associated with an Availability Zone (AZ) in a region. This means that we can attach and detach the ENI to different instances within the same Availability Zone.