Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network?（）

Which two link protocols are used to carry multiple VLANs over a single link?（）

A.VTP
B.802.1q
C.IGP
D.ISL
E.802.3u

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Which two benefits are provided by creating VLANs?（）

A. added security
B. dedicated bandwidth
C. provides segmentation
D. allows switches to route traffic between subinterfaces
E. contains collisions

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