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Which of the protocols below, operates at Layer 2 of the OSI model, and is used to maintain a loop-free network?
A. RIP
B. STP
C. IGRP
D. CDP
E. VTP
F. None of the above
参考答案
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HubB
SwitchC
BridgeD
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Transceiver
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RIPB
STPC
IGRPD
CDPE
VTP
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