A VPC provides an isolated virtual network for ECSs. You can configure and manage the network as required. The VPC service provides multiple connectivity options for ECSs to access the Internet. You can also customize the ECS access rules within a security group and between security groups to improve ECS security.
ELB uses the EIP and bandwidth provided by the VPC service.
After the VPC service becomes available to you, you can use Cloud Eye to view status of monitored objects of the service without requiring additional plug-ins to be installed.