CCNA系列認證CCNA(640-802)單項選擇題每日一練(2020.01.30)

來源：考試資料網(wǎng)

1 which address range efficiently summarizes the routing table of the addresses for router main?（）

2 The network administrator has discovered that the power supply has failed on a switch in the company LAN and that the switch has stopped functioning. It has been replaced with a Cisco Catalyst 2950 series switch. What must be done to ensure that this new switch becomes the root bridge on the network?（）

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3 Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch over FastEthernet?（）

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4 QoS policies are applied on the switches of a LAN. Which type of command will show the effects of the policy in real time?（）

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

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