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單項選擇題DNS servers provide what service?（）

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

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1.單項選擇題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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2.單項選擇題什么存儲第2層交換機使用，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.源交換機端口
D.目的地IP地址
E.目標端口地址
F.目的MAC地址

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3.單項選擇題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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4.單項選擇題在OSI模型的哪層運用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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5.多項選擇題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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