多选题Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network?（）A802.1dBVTPC802.1qDSTPESAP
多选题
Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network?（）
A
802.1d
B
VTP
C
802.1q
D
STP
E
SAP
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