Do You Need A Vpc

After configuring your network you can easily validate it with reachability analyzer.

Do you need a vpc. When we connect your vpc to your data center the vpc becomes part of your network it becomes another segment of your network and as such you need to secure it controlling the access to the vpc. In some cases the apps you ll deploy to your vpc might not be public. It is generally called a hybrid cloud and even if it s not the purpose of this article it s something that you should know if you are considering to use amazon vpc.

A virtual private cloud vpc is an on demand configurable pool of shared computing resources allocated within a public cloud environment providing a certain level of isolation between the different organizations denoted as users hereafter using the resources. As you probably expected there are some important things that you need to know about vpc security groups. A virtual private network that keeps your servers safe from the ravages of the public internet just like they were in your old data center.

You need a vpc. Click on image for larger view figure 1. As you can see in the figure each security group contains a collection of inbound rules and outbound rules.

Vpc endpoint enables you to privately connect your vpc to supported aws services and vpc endpoint services powered by privatelink without requiring an internet gateway nat device vpn connection or aws direct connect connection. In that case you need to prevent your applications in that vpc from being publicly accessible. There are many reasons to do that.

Instances in your vpc do not require public ip addresses to communicate with resources in the service. In vpc you don t need any external hardware or vpn to set up your own networks with your rules this is the perfect setup in order to create a private channel between your own data center and aws. See differences between ec2 classic and ec2 vpc in the ec2 user guide.

You don t need vpcs to secure lambda unlike ec2 instances which need vpcs to shield them from malicious traffic. In other cases you ll have different. Default vpcs are attached to the internet and all instances launched in default subnets in the default vpc automatically receive public ip addresses.