多选题In which three network technologies is traffic shaping used to prevent and manage congestion？ （）AAsynchronous Transfer Mode （ATM）Bdata-link switching （DLSw）CRoute Processor Redundancy （RPR）DFrame Relay （FR）EMetro EthernetFMultiprotocol Label Switching （MPLS）
多选题
In which three network technologies is traffic shaping used to prevent and manage congestion？ （）
A
Asynchronous Transfer Mode （ATM）
B
data-link switching （DLSw）
C
Route Processor Redundancy （RPR）
D
Frame Relay （FR）
E
Metro Ethernet
F
Multiprotocol Label Switching （MPLS）
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