Create a port-exclusive PWE3 service and find that the target port is not displayed. Which of the following descriptions about the cause of this phenomenon is correct?

By using the out-of-band FEC technology, the optical signal-to-noise ratio budget of the DWDM transmission network can be improved, and the length of the optical transmission section between DWDM transmission network elements can be increased.

NG WDM equipment uses Ethernet frames to carry MPLS packets

Which of the following boards belong to the dynamic optical bifurcation multiplexing board? (Multiple choice)

LCK insertion is preferred over AlS insertion. That is to say, if the user configures LCK insertion and meets the conditions for automatic AIS insertion, LCK is inserted