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單項(xiàng)選擇題What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?（）

A.lowest port MAC address
B.port priority number and MAC address.
C.VTP revision number
D.highest port priority number.
E.path cost

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1.多項(xiàng)選擇題在企業(yè)基礎(chǔ)架構(gòu)中的SAN，是為了滿(mǎn)足（）業(yè)務(wù)的需求

A.提高企業(yè)信息處理的能力
B.降低資本和運(yùn)行的費(fèi)用
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2.單項(xiàng)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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3.單項(xiàng)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.

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4.多項(xiàng)選擇題下列哪些是針對(duì)VoIP的網(wǎng)絡(luò)威脅（）

A.對(duì)于語(yǔ)音資源的非授權(quán)訪問(wèn)
B.危害網(wǎng)絡(luò)資源
C.偷聽(tīng)
D.DoS攻擊

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5.單項(xiàng)選擇題Assuming default setting,how can you erase the VTP database of VLANs on a CISCO IOS switch running in VTP server mode?（）

A.Enable VTP pruning
B.From privileged mode ,erase the startup configuration file,then reload.
C.From privileged mode ,erase the vlan date file, then reload.
D.Cycle the switch power.

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