IT Management & Cyber Security

Overview of an Amazon Virtual Private Cloud Virtual service provides the networking layer of EC2. A VPC is a virtual network that can contain EC2 instances as well as  network   resources for other AWS services. By default, every VPC is isolated from all other networks. You can, however, connect your VPC to other networks, including the Internet and other VPCs. In addition to EC2, VPCs are foundational to many  AWS services , so understanding how they work is fundamental to your success on the exam and as an AWS architect. Don’t assume you can ignore VPCs just because you’re not using EC2. A VPC can exist only within an AWS region. When you create a VPC in a region, it won’t show up in any other regions. You can have multiple VPCs in your account and create multiple VPCs in a single region. To keep things simple, I’ll start by assuming only one VPC in one region. Later, I’ll cover considerations for multiple VPCs. If you’re familiar with the components of a traditi...

Introduction to VPC  Elastic  Network Interfaces is an elastic network interface (ENI) allows an instance to communicate with other network resources including AWS services, other instances, on-premises servers, and the Internet. It also makes it possible for you to connect to the operating system running on your instance to manage it. As the name suggests, an ENI performs the same basic function as a  network  interface on a physical server, although ENIs have more restrictions on how you can configure them. Every instance must have a primary network interface (also known as the primary ENI) , which is connected to only one subnet. This is the reason you have to specify a subnet when launching an instance. You can’t remove the primary ENI from an instance. Related Products: –  AWS Certified Solutions Architect | Associate Primary and Secondary Private IP Addresses Each instance must have a primary private IP address from the range specified by the s...