As shown in the figure, all the devices are running in the PLS network. The downstream switch SWA sends the label mapping message of 1.1.1.1 to the SWB. After receiving the label distributed by the downstream switch SA, the SB distributes the label to the SC. The SWC receives the label from the SWB. The label is then sent to the SWD.
So what is the label control method and label distribution method in the network?
A . Ordered+DU
B . Independent+DU
C . Ordered+DoD
D . Independent+DoD
Answer: A