單項選擇題

Refer to the exhibit. Which switching feature is being tested？（）

A.loop guard
B.PortFast
C.root guard
D.BDPU guard


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2.單項選擇題

Refer to the exhibit. Voice traffic is marked "precedence 5." How much bandwidth is allocated for voice traffic during periods of congestion？（）

A.a minimum of 48 kb/s
B.a maximum of 48 kb/s
C.a minimum of 48% of the available bandwidth
D.a maximum of 48% of the available bandwidth

5.單項選擇題

Refer to the exhibit. In the diagram, the switches are running IEEE 802.1w RSPT. On which ports should root guard be enabled in order to facilitate deterministic root bridge election under normal and failure scenarios? （）

A.GE-3/1，GE-3/2
B.FE-2/1，F(xiàn)E-3/2
C.GE-1/1，GE-1/2
D.GE-4/1，GE-4/2
E.GE-2/1，GE-2/2
F.GE-3/1，GE-3/2，GE-4/1，GE-4/2，F(xiàn)E-2/1，F(xiàn)E-3/2