单选题GMPLS is based upon：（）APacket-based switching devicesBVPI/VCI-based switching devicesCNon-Packet-based devicesDNone of the aboveEA and B
单选题
GMPLS is based upon：（）
A
Packet-based switching devices
B
VPI/VCI-based switching devices
C
Non-Packet-based devices
D
None of the above
E
A and B
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