單項(xiàng)選擇題Which of these correctly identifies a difference between the way BPDUs are handled by 802.1w and 802.1D？（）

A.802.1D bridges do not relay BPDUs.
B.802.1w bridges do not relay BPDUs.
C.802.1D bridges only relay BPDUs received from the root.
D.802.1w bridges only relay BPDUs received from the root.


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2.多項(xiàng)選擇題Under which two circumstances would an RSTP bridge flush its CAM table？（）

A.upon a port state change
B.upon receiving a topology change notification
C.when transitioning from discarding to forwarding
D.when transitioning from forwarding to discarding
E.only when changing from listening to discarding
F.when CAM resources have been completely used up

3.單項(xiàng)選擇題Why does RSTP have a better convergence time than 802.1D？（）

A.it is newer
B.it has smaller timers
C.it has less overhead
D.it is not timer-based

4.單項(xiàng)選擇題

Refer to the exhibit. Which of these is applied to the Bearer class？（）

A.WRED
B.traffic shaping
C.packet marking
D.packet classification
E.FIFO queuing within the class

5.單項(xiàng)選擇題

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

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