Help Center/ Virtual Private Cloud/ Service Overview/ Basic Concepts/ Subnet

Updated on 2024-11-22 GMT+08:00

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Subnet

A subnet is a unique CIDR block with a range of IP addresses in a VPC. All resources in a VPC must be deployed on subnets. Subnets in a VPC cannot overlap with each other.

All instances in different subnets of the same VPC can communicate with each other by default, and the subnets can be located in different AZs. If you have a VPC with two subnets in it and they are located in different AZs, they can communicate with each other by default.
A cloud resource can be in a different AZ from its subnet. For example, a cloud server in AZ 1 can be in a subnet in AZ 3. If AZ 3 becomes faulty, cloud servers in AZ 1 can still use the subnet in AZ 3, and your services are not interrupted.

Figure 1 Subnet

Managing Subnets

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