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多項選擇題Which two commands correctly verify whether port security has been configured on portFastEthernet 0/12on a switch？（）

A.SW1#show swithport port-security interface FastEthernet 0/12
B.SW1# show swithport port-secure interface FastEthernet 0/12
C.SW1# show port-secure interface FastEthernet 0/12
D.SW1#show running-config

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1.單項選擇題Which IP address can be assigned to an Internet interface?（）

A.10.180.48.224
B.9.255.255.10
C.192.168.20.223
D.172.16.200.18

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2.多項選擇題能夠幫助獲得強密碼策略的具體方法（）

A.登陸嘗試失敗一定次數(shù)后禁用賬號
B.設置密碼有效期
C.不使用明文密碼
D.使用強密碼

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3.單項選擇題 A network administrator is troubleshooting the OSPF configuration of routers R1 an dR2.The routers cannote stablish an adjacency relation ship on their common Ethernet link.The graphic shows the output of the show ip ospf interface e0 command for routers R1 an dR2.Based on the information in the graphic，what is the cause of this problem？（）

A.The OSPF area is not configured properly.
B.The priority on R1 should be set higher.
C.The cost on R1 should be set higher.
D.The hello and dead timers are not configured properly.
E.A backup designated router needs to be added to the network.
F.The OSPF process ID numbers must match.

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4.單項選擇題What is the principle reason to use a private IP address on an internal network?（）

A.Subnet strategy for private companies.
B.Manage and scale the growth of the internal network.
C.Conserve public IP addresses so that we do not run out of them.
D.Allow access reserved to the devices.

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5.單項選擇題Which layer of the OSI reference model uses flow control, sequencing, and acknowledgements to ensure that reliable networking occurs?（）

A.data link
B.network
C.transport
D.presentation
E.physical

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