What are the reasons why users may not be able to connect to the WLAN properly? (Multiple choice)

Which of the following is a wireless LAN standard originally developed by the IEEE?

When AC is only one interface access convergence layer switches, user traffic directly through convergence layer switch out of the public, not through the AC, what should network mode be at this time?

After passing, C. passing, after not following the following two-link backup networking, the description is incorrect.

There are many video conferences in large companies, and QoS generally adopts the service model.