VPC allows you to create customized virtual networks in your logically isolated AZ. Such networks are dedicated zones that are logically isolated for your ECSs. You can define security groups, virtual private networks (VPNs), IP address segments, and bandwidth for a VPC. This facilitates internal network configuration and management as well as secure and convenient network modification. You can also customize the ECS access rules within a security group and between security groups to strengthen ECS security protection. For more information, see Virtual Private Cloud User Guide.