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Direct Connect Gateway

Overview

Definition: A Direct Connect Gateway is a grouping of Virtual Private Gateways (VGWs) and Private Virtual Interfaces (VIFs) within the same AWS account.

Purpose: Enables interfacing with VPCs across different AWS Regions (except AWS China Region).

Key Features

Inter-Region Access: Interface with VPCs in any AWS Region.

Gateway Associations:

Transit Gateway: For multiple VPCs in the same region.

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Virtual Private Gateway: For single or fewer VPCs in multiple regions.

NOTE: For VPCs in the same region a VPG is not necessary. A transit gateway can instead be configured.

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Resource Sharing: Share a private virtual interface with multiple VPCs, reducing the number of BGP sessions.

Technical Details

Global Availability: Direct Connect Gateway is a globally available resource.

Creation and Access: Create the Direct Connect Gateway in any public region and access it from all other public regions.

Usage

Improved Efficiency: Reduces the number of required BGP sessions by allowing multiple VPCs to interface through a single private VIF.

Centralized Management: Facilitates centralized management of network connectivity across multiple VPCs and regions.

Configuration

Associations:

With Transit Gateway: Best for environments with multiple VPCs within the same region needing a common connection point.

With Virtual Private Gateway: Suitable for environments with fewer VPCs.

Global Access: Utilize a single Direct Connect Gateway to manage connections across all supported regions.

Exam Tips

Regional Limitations: Note that AWS China Region is not supported.

Centralized Connection Point: Understand the benefits of using a Direct Connect Gateway for centralized management and connection efficiency.

Inter-Region Use: Remember that Direct Connect Gateway facilitates global resource access across multiple public regions.

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