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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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1.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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2.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(fǎng)問(wèn)
B.危害網(wǎng)絡(luò)資源
C.偷聽(tīng)
D.DoS攻擊

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3.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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4.單項(xiàng)選擇題DNS servers provide what service？（）

A.they run a spell check on host names to ensure accurate routing
B.they map individual hosts to their specific IP address
C.they convert domain names into IP address
D.Given an IP address，they determine the name of the host that is…

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5.多項(xiàng)選擇題在無(wú)線(xiàn)網(wǎng)絡(luò)中，網(wǎng)絡(luò)管理員需要考慮（）安全問(wèn)題

A.無(wú)線(xiàn)網(wǎng)絡(luò)使用WEP或WPA/TKIP是非常安全的，不容易受到黑客攻擊
B.無(wú)線(xiàn)網(wǎng)絡(luò)使用WPA2/AES應(yīng)該有至少6個(gè)字符的密碼短語(yǔ)
C.如果IPSec VPN是可用的，那么在任何公共無(wú)線(xiàn)LAN中部署它
D.如果無(wú)線(xiàn)接入不是必須的，禁用無(wú)線(xiàn)設(shè)備或無(wú)線(xiàn)NIC

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