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Amazon VPC

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Aw Security Enterprise Virtualization Networking Networking Layer Networking Architecture DEVOPS AWS

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description Amazon VPC Overview

Amazon Virtual Private Cloud (VPC) is the fundamental networking component that allows you to provision a logically isolated section of the AWS Cloud. It gives users complete control over their virtual networking environment, including IP address ranges, subnets (public/private), and routing tables. Proper VPC design is the bedrock of any secure, multi-tier application architecture, ensuring resources cannot communicate unless explicitly allowed.

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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