Hi everyone, welcome to the fourth chapter in our Tencent Cloud sys ops associate course, cloud network deployment practices. At the end of this chapter, you'll be able to manage the basic configurations for virtual private cloud. Configure network connectivity in VPCs and manage network security in VPCs. In this chapter we'll cover five sections, VPCs and sub nets, routing tables and ENI, network connectivity configurations, security configurations and use cases. This video will cover the first section, VPCs and subnets. Subsequent videos will cover the remaining sections. Let's get started with section one, VPCs and subnets. In this video we'll cover how to create VPCs, configure subnets, modify CVM private IPs and delete VPCs and subnets. To create a VPC, log into the Tencent Cloud console and click on Virtual Private Cloud under the products list to access the dashboard. You can click new to create a new VPC. When you configure a private network and the initial subnet information, you'll need to input the VPC information as well as the original subnet information. The VPC information consists of the region, name and CIDR block. The original subnet information consists of the subnet name, CIDR block, availability zone and associated routing table which can be default or custom. Once created you can view the details of the VPC in the console, including its basic information and resources. Basic cloud resources such as CVMs and CLBs in addition to network resources such as subnets, routing tables, net gateways, flow logs and network probes will all show up under this section of the console. Okay, let's look at how to configure subnets which includes adding subnets and associating routing tables. A private network contains at least one subnet and users can create one or more subnets simultaneously. Each sub net must also be associated with a routing table which is used to specify the outbound route for the subnet. To add a subnet, log into the VPC console, click submit, select the region and click new. Then select the VPC IP range, CIDR, availability zone and associated routing table. In the VPC console under route tables, you will see a list of routing tables and their details including their names, types, networks, number of associated subnets and creation times. You can also create a new routing table, delete a routing table or associate subnets with them. Okay, let's go over how to modify CVM private IPs starting with an overview of ENI. The main network interface is the network interface that is created in conjunction with the CVM. While the auxiliary network interface is the additional network interface that is created by the user. The main private IP is either randomly assigned by the system or specified by the user when creating the ENI. While the auxiliary private IP is configured by the user when creating or editing the ENI. Note that you can have multiple IPs for one ENI. The IP and interface for ENI supports IPV4 address management in Tencent Cloud's international console, allowing you to assign a private IP, associate a security group or bind a public IP. You can also delete VPCs and subnets and edit CIDR blocks in the console.