According to the IEEE 802.1Q standard, where is the VLAN identification field in the Ethernet frame?

Which of the following parameters are required to set up a network management workstation?

Is the following description correct? Users can establish PVC connections between different board ports or between different ports on the same board. The main purpose is to realize the point-to-point interconnection between two different users.

What are the northbound interface types provided by U2000 to the network management layer?

Is the following description correct? In the GPON network, in order to avoid data conflicts and improve network utilization efficiency, the downstream direction adopts TDMA multiple access mode and arbitrates the data transmission of each ONU.