Public and Private VIFs

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Virtual interfaces (VIFs) are AWS Direct Connect components that allow you to connect your on-premises infrastructure to AWS services. Public and private VIFs describe two different types of virtual interface configurations that enable access to a variety of AWS resources. Public VIFs enable you to connect to AWS public resources such as Amazon S3, AWS global services, and public IPv4 and IPv6 IP addresses. Private VIFs enable you to connect your on-premises network with resources within one or more Amazon Virtual Private Clouds (VPCs). Choosing between public and private VIFs depends on your organization's requirements for accessing specific AWS services, security, and isolation in different network scenarios.

Guide: Public and Private VIFs for AWS Direct Connect

What it is: VIFs, or Virtual Interface, are essentially your gateways to AWS Services. There are two types of VIFs when it comes to AWS Direct Connect - Public VIFs and Private VIFs.

Public VIFs: These allow a direct connection from your network to public AWS services like Amazon S3 or Amazon DynamoDB. They effectively utilize a segregated, private network path instead of the public internet.

Private VIFs: These provide a secure, direct connection from your network to your Amazon VPC (Virtual Private Cloud). Private VIFs are used when workloads are hosted in your own VPC and secure access is necessary.

Why it is important: Understanding both Public and Private VIFs is important since they provide different abilities. Public VIF can be used for accessing services hosted on AWS that are publically available whilst Private VIF can provide access to your secured AWS resources. Being able to configure and manage these VIFs can greatly enhance the connectivity and security between your AWS cloud and on-premises or colocation infrastructure.

How it works: Public and Private VIFs are established through AWS Direct Connect, a service that provides a more consistent network experience than internet-based connections.
Exam Tips: Answering Questions on Public and Private VIFs: In the AWS Solution Architect exam, you may be asked questions regarding which VIF to use for what resources/needs. Remember, Public VIFs are used for services accessible via the internet and Private VIFs for resources that reside in your own VPC. Familiarize yourself with different AWS services and imagine how they’d be accessed (via public internet or through a secured VPC) to help identify the proper VIF.
Lastly, practice deployment scenarios. Be comfortable with creating and configuring both types of interfaces, as practical questions related to deployment may appear in the exam.

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