description Amazon VPC Overview
Amazon Virtual Private Cloud, or VPC, provides a logically isolated network within AWS. Teams choose an IP address range and divide the network into subnets, then use route tables to determine where traffic can travel. This gives an application a defined network structure, including areas with internet access and areas intended for resources that do not need a direct public connection. Its value becomes clear in applications with separate web and database components, where each layer needs different access rules.
Routing alone does not determine security: security groups and network access controls also shape permitted traffic. A VPC therefore supports controlled communication but does not guarantee that resources are isolated from one another by default. AWS's VPC documentation outlines the networking controls used to build and operate these environments.
help Amazon VPC FAQ
What is Amazon VPC actually used for in an AWS application?
Amazon VPC is where you define the private network for AWS resources such as EC2 instances, RDS databases, and load balancers. A typical setup uses public subnets for internet-facing services and private subnets for databases or internal workers.
Do I need to choose an IPv4 CIDR block when creating a VPC?
Yes, every Amazon VPC needs an IPv4 CIDR block such as 10.0.0.0/16 or 172.31.0.0/16. AWS also supports IPv6 CIDR blocks, but IPv4 planning still matters because subnet sizes and peering conflicts are common long-term issues.
How do public and private subnets work inside Amazon VPC?
A public subnet is associated with a route table that sends internet traffic through an Internet Gateway. A private subnet usually reaches outbound internet through a NAT Gateway while staying unreachable directly from the public internet.
How does Amazon VPC connect to an office network or another cloud environment?
Amazon VPC can connect to on-premises networks through AWS Site-to-Site VPN or AWS Direct Connect. For multiple VPCs, AWS Transit Gateway is commonly used to avoid a messy web of one-to-one VPC peering links.
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