The mask length is 12 bits can be expressed as?

The transmission rate of an Eth-Trunk port in manual link aggregation mode is related to ().

After the network administrator uses the TracertRoute function on the router device, in the data packet sent by the router, the value of the Protocol field in the IPv4 header is?

The wireless access controller (AC, Access Controller) is the overall management and control device in the FIT AP architecture. What is wrong about the role of AC in the following description?

What are the functions of OSPF protocol DR and BDR?