Internal network: only bare VLANs are provided, and IP address management is optional. No gateway is provided. This network has only two layers and does not provide the ability to access Layer 3. Such networks are generally used internally and do not allow networks with external routing.
Routing network: Provides VLAN, IP address management, and Layer 3 gateway. For all routing networks under a VPC, the routes between these routing networks are automatically opened, so that virtual machines under different routing networks can access each other.
Direct Connected Network: Provides the ability to directly connect virtual machines to external networks. VMs deployed to this network can be assigned to external IP addresses.
External network. The so-called external network is the network plane that the gateway and routing are not managed in the virtual data center solution. Provides the ability to directly connect virtual machines to external networks. The external network appears as a separate VLAN in the virtual data center scenario, and the virtual data center solution does not manage the IP address allocation on this VLAN.