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單項(xiàng)選擇題What is the function of the command switchport trunk native vlan 999 on a switch？（）

A.It designates VLAN 999 for untagged traffic.
B.It blocks VLAN 999 traffic from passing on the trunk.
C.It creates a VLAN 999 interface.
D.It designates VLAN 999 as the default for all unkown tagged traffic.

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A.源MAC地址
B.源IP地址
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E.目標(biāo)端口地址
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2.單項(xiàng)選擇題The network administrator is asked to configure 113 point-to-point links.Which IP addressing scheme best defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses？（）

A.10.10.0.0/18 subnetted with mask 255.255.255.252
B.10.10.0.0/25 subnetted with mask 255.255.255.252
C.10.10.0.0/24 subnetted with mask 255.255.255.252
D.10.10.0.0/23 subnetted with mask 255.255.255.252
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3.單項(xiàng)選擇題在OSI模型的哪層運(yùn)用RSTP用來(lái)防止循環(huán)？（）

A.數(shù)據(jù)鏈路
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C.物理
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4.多項(xiàng)選擇題Which two commands correctly verify whether port security has been configured on port FastEthernet 0/12 on a switch？（）

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D.SW1#show running-config
E.SW1#show port-security interface FastEthernet 0/12

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5.單項(xiàng)選擇題選舉根端口主要確定哪個(gè)值？（）

A.最低端口MAC地址
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