Exam CV0-003 topic 1 question 314 discussion

Explanation: With 18 VPCs across multiple regions, Hub and Spoke is the most scalable and manageable solution for interconnecting them efficiently. ✔ Centralized connectivity – A central "hub" VPC connects to all "spoke" VPCs, simplifying management. ✔ Better scalability – Easier to scale than direct VPC peering, which can become unmanageable with many connections. ✔ Supports inter-region traffic – Works across multiple regions efficiently. ✔ Reduces complexity & cost – Minimizes the number of connections required compared to a full mesh approach.

VPC peering can connect two VPCs directly, but it doesn't scale well. With 18 VPCs, you'd need numerous peering connections, which can quickly become unmanageable (especially as the number of VPCs grows).

I'm changing my response to C After a careful review of the scenario, I think the hub-and-spoke model using AWS Transit Gateway would be the best architecture to connect 18 VPCs in an AWS cloud environment. Reasons for Choosing Hub-and-Spoke with AWS Transit Gateway: 1. Scalability: Transit Gateway allows you to connect multiple VPCs efficiently without creating a complex web of peering connections. This scalability is essential as the number of VPCs grows. 2. Centralized Management: It provides centralized routing and management, simplifying the administration of network connections and policies across all VPCs. 3. Reduced Complexity: With VPC peering, each VPC needs a direct peering connection to every other VPC, leading to a large number of connections and increased complexity. Transit Gateway minimizes this by acting as a single point of connectivity.

Since this configuration is in the AWS environment, I m going with VPC hands down.

C. Hub and spoke: This architecture involves a central hub VPC that connects to all other VPCs (spokes). It scales well and simplifies management by reducing the number of direct connections required between VPCs. All traffic between spoke VPCs goes through the hub, facilitating easier routing and security management.

Ok changing to Hub and Spoke since the scenario includes a more complex environment. From AWS: "If more than two network address spaces (VPCs, on-premises networks) are connected via VPC peering, AWS Direct Connect, or VPN, then use a hub-and-spoke model like that provided by AWS Transit Gateway. For only two such networks, you can simply connect them to each other, but as the number of networks grows, the complexity of such meshed connections becomes untenable. AWS Transit Gateway provides an easy to maintain hub-and-spoke model, allowing routing of traffic across your multiple networks."

My understanding of hub and spoke as it pertains to cloud computing is incomplete but I'm sticking with VPC Peering.

I often agree with Pongsathorn but I'm going with VPC peering. Hub and spoke seems more appropriate for a physical network. From AWS: https://docs.aws.amazon.com/vpc/latest/peering/what-is-vpc-peering.html

C. **Hub and spoke** A hub-and-spoke network architecture is well-suited for connecting multiple VPCs (Virtual Private Clouds) with interdependencies. In this architecture, you have a central hub VPC that serves as a centralized point for connecting to other VPCs (the spokes). Each product's VPC can be a spoke connected to the central hub VPC. This approach offers several advantages: 1. **Centralized Control**: The hub VPC can provide centralized control over network traffic, security policies, and routing. 2. **Reduced Complexity**: It simplifies network management by avoiding direct connections between every pair of VPCs, which can become complex as the number of VPCs grows. 3. **Security**: You can implement security measures, such as Network Address Translation (NAT) gateways and firewall rules, at the hub to control traffic between VPCs.