Transit Virtual Interfaces

5 minutes 5 Questions

Transit Virtual Interfaces (transit VIFs) are a type of AWS Direct Connect virtual interface that enables you to use AWS Direct Connect to connect your on-premises network with AWS Transit Gateway resources. Transit VIFs provide a single interface for connecting multiple VPCs through the AWS Transit Gateway. By using Transit VIFs and Transit Gateway, you can centralize and simplify the management of inter-VPC routing, including Edge-to-Edge routing between VPCs, VPN connections, and your on-premises infrastructure. Transit VIFs make it easy to scale your network connectivity, support multi-account environments, and improve the security and manageability of your AWS hybrid cloud infrastructure.

Guide on Transit Virtual Interfaces

What is Transit Virtual Interfaces?
Transit Virtual Interfaces are part of the AWS Direct Connect service, allowing you to connect your on-premises network to Amazon VPCs in a different AWS Region. It’s a crucial aspect of extending your network to Amazon VPCs that are located geographically far from your on-premises network.

Why is it Important?
Transit Virtual Interfaces avoid AWS backbone network congestion, ensuring a fragmented yet speedy transfer of data across regions. It plays a predominant role in providing a private, consistent network experience.

How Does it Work?
It works by establishing a dedicated network connection from your premises to AWS. You can use multiple virtual interfaces on top of the same physical connection to interact with several VPCs. It eliminates the need to establish separate connections for each VPC, saving costs and administrative overhead.

Exam Tips: Answering Questions on Transit Virtual Interfaces
Pay attention to scenarios where data transfer between regions and VPCs is required. Understanding the difference between public, private, and transit virtual interfaces is vital. The cost-saving and low-latency capabilities of transit virtual interfaces are often highlighted in questions. Always remember that Transit gateways are required to use transit virtual interfaces.

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Question 1

An organization is running workloads across multiple VPCs in a region. They have implemented a Direct Connect connection between their on-premises data center and Amazon VPC. They would like to utilize a transit virtual interface to access VPCs from the on-premises data center. What should they do?

Create a public virtual interface and peer with VPCs using BGP Use a VPN connection and associate it with the transit virtual interface Create a private virtual interface to connect to multiple VPCs Create a Direct Connect Gateway and associate it with the transit virtual interface and VPCs

Correct Answer: Create a Direct Connect Gateway and associate it with the transit virtual interface and VPCs

The correct solution is to create a Direct Connect Gateway, as it supports transit virtual interfaces and can be associated with multiple VPCs in a region, allowing VPCs to be accessed from the on-premises data center. Private virtual interfaces, public virtual interfaces, VPNs, PrivateLinks, and transit VPCs do not support this use case.

Question 2

A company has recently established a Direct Connect connection to their VPC. They need to create a transit virtual interface to use with Direct Connect Gateway and interconnect multiple VPCs. Which is the best approach to solve the problem?

Create a private virtual interface and associate it with the Direct Connect Gateway Create a hosted connection and associate it with the Direct Connect Gateway Create a public virtual interface and associate it with the Direct Connect Gateway Create a transit virtual interface and associate it with the Direct Connect Gateway

Correct Answer: Create a transit virtual interface and associate it with the Direct Connect Gateway

The correct answer is to create a transit virtual interface, as it allows for connecting multiple VPCs to a Direct Connect Gateway. Private, public, and hosted connections, as well as transit VPCs and AWS VPNs, do not meet the requirement of interconnecting multiple VPCs.

Question 3

An organization is using Direct Connect to connect their on-premises network to AWS. They want to optimize the data transfer cost between their on-premises data center and multiple VPCs in different regions. What should they do to achieve this?

Create a Direct Connect Gateway with transit virtual interfaces and configure inter-region peering Use Site-to-Site VPNs for each VPC and configure dynamic routing using BGP Create individual Direct Connect connections for each region Configure VPC peering between VPCs in different regions

Correct Answer: Create a Direct Connect Gateway with transit virtual interfaces and configure inter-region peering

The correct solution is to create a Direct Connect Gateway with transit virtual interfaces, as it allows for inter-region peering and optimizes data transfer costs between an on-premises data center and multiple VPCs in different regions. Individual Direct Connect connections, Site-to-Site VPNs, VPC peering, Virtual Private Gateways, and transit VPCs do not offer the same level of cost optimization.

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