Creating Your First AWS VPC

Creating a Virtual Private Cloud (VPC) in AWS allows you to launch AWS resources into a network that you have defined. Here's a simplified summary to help you understand the basics of setting up a VPC in AWS:

• Virtual Private Cloud (VPC): A VPC is a segregated section of the cloud where you can deploy AWS resources in a defined virtual network. It's essentially your own private section of the AWS cloud.
• Multiple VPCs: You can have multiple VPCs within a single AWS region. The default limit is five VPCs per region, but this is a soft limit and can be increased upon request.
• CIDR Blocks: VPCs use Classless Inter-Domain Routing (CIDR) to define the IP address range for the VPC. Each VPC can have up to five CIDR blocks associated with it.
  • Minimum CIDR Size: /28 (16 IP addresses)
  • Maximum CIDR Size: /16 (65,536 IP addresses)
• IP Addressing: Only private IPv4 address ranges are allowed for VPCs. These ranges are specified to prevent conflicts with the public internet.

• Selecting CIDR Ranges: When choosing a CIDR range for your VPC, it's crucial to ensure that it does not overlap with CIDR blocks of your other VPCs or any external networks (like corporate networks) to avoid IP addressing conflicts, especially if you plan to connect these networks in the future.

Key Considerations

• IP Address Ranges: Use private IP address ranges as specified by RFC 1918 for your VPCs. Remember to choose ranges that do not conflict with other networks you may need to connect with.
• Connectivity: Plan for connectivity between VPCs and other networks. Avoiding overlapping IP ranges ensures seamless networking between different environments.

This overview provides the foundation for creating a Virtual Private Cloud in AWS, emphasizing the importance of careful planning and configuration to ensure a functional and isolated network environment for your AWS resources.