A VPC is a logically isolated network space. You can create your own dedicated VPC and add network configurations such as VPC subnets, route tables, security groups, MTU, and edge gateways to a VPC without affecting other network spaces, such as other VPCs or physical networks.
VPC subnets within the same VPC can communicate with each other. Communication with other VPCs or other network spaces (such as the public internet, traditional VLAN networks, or IDCs) requires an edge gateway.
The system automatically creates the following for each VPC:
Reserved subnet: Used to create gateway instances. Its CIDR is the internal service IP pool configured when VPC networking is enabled. Gateway instances allocate IPs from this subnet to obtain their identity within the VPC. The reserved subnet cannot be edited or deleted.
Default route table: The route table associated with VPC subnets by default. You can edit its routing rules, but it cannot be deleted.
Default security group: A security group that includes all virtual machines in the VPC. The default security group cannot be edited or deleted.
