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How do I configure VPC subnets for public and private networking separation?

Asked on Oct 30, 2025

Answer

Configuring VPC subnets for public and private networking separation is essential for secure and efficient cloud infrastructure. This involves creating distinct subnets for public-facing resources and private backend systems, typically using network access control lists (ACLs) and route tables to manage traffic flow.

Create a new VPC in your cloud provider's console or using an Infrastructure as Code (IaC) tool like Terraform.
Define at least two subnets: one for public access (e.g., web servers) and one for private access (e.g., databases).
Assign an internet gateway to the VPC and update the route table for the public subnet to allow outbound internet traffic.
Ensure the private subnet route table does not have a route to the internet gateway, maintaining its isolation.
Use network ACLs and security groups to control inbound and outbound traffic for each subnet, enhancing security.

Additional Comment:

Public subnets should have a route to the internet gateway for external access.
Private subnets typically use a NAT gateway or NAT instance for outbound internet access without exposing resources directly.
Regularly review and update security group rules and network ACLs to ensure they align with your security policies.
Consider using VPC peering or transit gateways for communication between different VPCs if needed.

✅ Answered with Cloud Computing best practices.

Didn’t find the answer you were looking for?

How do I configure VPC subnets for public and private networking separation?

Asked on Oct 30, 2025

Answer

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