Help Center/ Virtual Private Cloud/ Drawer/ Creating a VPC with a Default Subnet/ AZ
Updated on 2024-11-26 GMT+08:00
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AZ

Description

An AZ is a physical region where resources use independent power supplies and networks. AZs are physically isolated but connected through an internal network.

Each region contains multiple AZs. If one AZ is unavailable, other AZs in the same region continue to provide services.

If Edge is displayed, select an edge AZ based on your service requirements. If Edge is not displayed, you do not need to set the subnet AZ, which does not affect your service running.

  • By default, all instances within a given VPC can communicate with each other, even if they are in different subnets that are located in different AZs. For example, if you have a VPC with two subnets, A01, in AZ 1, and A02, in AZ 2. Subnet A01 and A02 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.
  • You can select Central if you want to provision cloud resources on the cloud and run your workloads on the cloud.
  • You can select Edge if you want to provision cloud resources to an edge site and run workloads at the edge site. For details about edge sites, see CloudPond.

FAQ

Can Subnets in Different AZs Communicate with Each Other?

Subnets in the same VPC can communicate with each other through an internal network by default regardless of if they are in the same AZ or not. Different VPCs, however, cannot communicate with each other, so subnets in different VPCs cannot communicate with each other even if they are in the same AZ.
  • To enable subnets in different VPCs in the same region to communicate with each other through an internal network, you can use a VPC peering connection.
  • To enable subnets in different VPCs from different regions to communicate with each other through an internal network, you can use Cloud Connect.
Parent Topic: Creating a VPC with a Default Subnet