(single) Which of the following is not part of the PON network system?

The following description which is correct? UA5000 and lanswitch are docking by GE , the two sides work mode of the port can be a self-negotiation mode and the other is forced mode.

(single) What are the device maintenance methods that the MA5600T does not currently support?

(single) In the GPON network, which of the following is the role of the DBA?

In 802.1Q tag header, how many bit domain is VLAN ID? and how many VLAN can indicate in total?