Which of the following statements about the division of OSPF protocol area is wrong?

UDP cannot guarantee the reliability of data transmission, and does not provide the functions of message sequencing and flow control. It is suitable for flows with low transmission reliability requirements but high transmission speed and delay requirements.

MIB (Management Information Base) is a virtual database that exists only in NMS.

The administrator plans to implement route backup by configuring static floating routes, what is the correct way to achieve this?

The Layer 2 networking of WLAN means that the STA uses the AC as its gateway.