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單項選擇題

Which command enables RSTP on a switch？（）

A.spanning-tree mode rapid-pvst
B.spanning-tree uplinkfast
C.spanning-tree backbonefast
D.spanning-tree mode mst

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單項選擇題

Refer to the exhibit A frame on vlan 1on switch s1 is sent to switch s2 when the frame is received on vlan 2,what causes this behavior?（）

A.trunk mode mismatches
B.vlans that do not correspond to a unique IP subnet
C.native vlan mismatches
D.allowing only vlan 2 on the destination.

多項選擇題

下列哪些是針對VoIP的網(wǎng)絡(luò)威脅（）

A.對于語音資源的非授權(quán)訪問
B.危害網(wǎng)絡(luò)資源
C.偷聽
D.DoS攻擊

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