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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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1.單項(xiàng)選擇題什么存儲(chǔ)第2層交換機(jī)使用，以決定在哪里轉(zhuǎn)發(fā)接收到的幀？（）

A.源MAC地址
B.源IP地址
C.源交換機(jī)端口
D.目的地IP地址
E.目標(biāo)端口地址
F.目的MAC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
E.10.10.0.0/16 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用來防止循環(huán)？（）

A.數(shù)據(jù)鏈路
B.網(wǎng)絡(luò)
C.物理
D.傳輸

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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？（）

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
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
B.端口的優(yōu)先級(jí)號(hào)和MAC地址
C.VTP修訂號(hào)
D.最高的端口優(yōu)先級(jí)數(shù)量
E.路徑開銷（cost）

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