Multi-Region Connectivity: Transit Gateway with three VPCs

What is VPC ?

A Virtual Private Cloud (VPC) is a logically isolated section of the AWS cloud where you can launch AWS resources in a virtual network that you define. It provides complete control over the network, including IP address ranges, subnets, route tables, and security settings. VPC is the foundation of AWS networking, enabling secure communication between services and on-premises environments through VPN or AWS Direct Connect.

What is transit Gateway ?

An AWS Transit Gateway acts as a central hub that connects multiple VPCs, on-premises networks, and even other AWS services. Instead of managing a web of peering relationships between VPCs, Transit Gateway simplifies your network topology by serving as a single point of connection for many networks. It allows you to manage network traffic and create connectivity at scale without complex route management.

How does it works and different from VPC Peering.

In VPC Peering, you establish a direct link between two VPCs to allow communication. However, it is a one-to-one relationship, meaning you need to create a separate peering connection for each pair of VPCs. This method becomes complex to manage as the number of VPCs increases, resulting in a "mesh" of connections.

Transit Gateway, on the other hand, works as a hub-and-spoke model. It allows multiple VPCs and on-premises networks to connect to a central gateway. Each VPC or network only needs a single attachment to the Transit Gateway, which simplifies routing and management.

How does it solve the problems.

• Centralized Management: Routing is simplified as it centralizes traffic flows and policies, eliminating the complexity of handling multiple peering connections.

• Cost-Efficiency: With Transit Gateway, there’s less overhead in managing connections, and it reduces the costs of scaling peering relationships as you can avoid managing a large number of connections manually.

• Multi-Region Support: Transit Gateway also enables seamless VPC communication across multiple regions, unlike VPC Peering which is region-specific.

• Scalability: Transit Gateway allows for scalable communication by supporting thousands of VPCs and on-premises networks through a single gateway. This removes the need for individual peering connections.

Practical Implementation :

• There are 10 easy steps for creation of transit gateway you can refer my github repo: https://github.com/mohit-decoder/aws_project.git

• Video Reference: https://youtu.be/h6woUZlxcp8?si=_u9J23muEzDK3XQ8

• Also thanks to mentor Saikiran Pinapathruni for creating such informative and real-time scenario based projects and practicals.