A large enterprise is planning to migrate its entire internal business system to HUAWEI CLOUD...

Opened VPN Tunnel service, which is used by administrators during operation and maintenance VPN Encrypted communication

Create multiple ECS instances under a VPC to install subsystems used by different departments, and assign only private IP addresses to all ECS instances and put them into unique security groups

Establish a separate bastion host for remote login and O&M, and authorize the bastion host to access other subsystems ECS example

D. Use the security group function in VPC to put ECS instances running different subsystems into dedicated security groups