VPC Networking and Connectivity

A Virtual Private Cloud (VPC) is a logically isolated network on Tencent Cloud where you deploy your resources. VPC networking is essential for building secure, well-architected applications.

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What is a VPC?

A VPC provides:

• Isolation — logically separated from other tenants
• Control — you define IP ranges, subnets, and routing
• Security — security groups and network ACLs control traffic
• Regional scope — a VPC spans all availability zones in a region

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VPC Components

CIDR Blocks

When creating a VPC, you define a CIDR block:

CIDR Block	Usable IPs	Common Use
10.0.0.0/8	~16 million	Large environments
172.16.0.0/12	~1 million	Medium environments
192.168.0.0/16	~65,000	Small environments

A VPC supports one primary CIDR and can add secondary CIDR blocks for expansion.

Subnets

A subnet is a range of IP addresses within a VPC:

• Each subnet belongs to a single availability zone
• Has its own CIDR block (subset of the VPC CIDR)
• Supports route table association