The controller is the core component of SDN. The controller is connected to the device through the southbound interface. Which of the following belongs to the southbound protocol of the controller? (Multiple choice)

Compared with STP, which of the following port roles are newly defined in RSTP? (Multiple choice)

What is the wrong statement about static routing in Huawei equipment? (Multiple choice)

When using the ping command on the VRP platform, if it is necessary to specify an IP address as the source address of the echo request message, which of the following parameters should be used?

Which of the following attributes cannot be used as a parameter to measure Cost?