VPC Fundamentals

Virtual Private Cloud Core Concepts

What is VPC?

Virtual Private Cloud provides isolated network environment within AWS cloud infrastructure.

Isolated network: Logically separated from other networks
Complete control: IP addressing, subnets, routing tables
Security: Security groups and network ACLs

CIDR Blocks

Classless Inter-Domain Routing defines IP address ranges for your VPC.

10.0.0.0/16

65,536 IP addresses (recommended)

172.16.0.0/12

1,048,576 IP addresses

192.168.0.0/16

65,536 IP addresses

VPC Components

Subnets

Divide VPC into smaller network segments

Route Tables

Control traffic routing within VPC

Internet Gateway

Provides internet access to VPC

VPC Fundamentals Exam Tips

  • • VPC is region-specific but spans multiple Availability Zones
  • • Default VPC has CIDR block 172.31.0.0/16 with public subnets
  • • Custom VPC requires manual configuration of internet connectivity
  • • CIDR blocks cannot be changed after VPC creation
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