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單項選擇題在一個共享的雙絞線的網(wǎng)絡上的接口上產(chǎn)生了沖突檢測和載波偵聽.通過這個描述，關于這個網(wǎng)絡接口你知道了什么？（）

A.這是一個10Mb/s的交換端口
B.這是一個100Mb/s的交換端口
C.這是一個工作在半雙工模式下的以太口
D.這是一個工作在全雙工模式下的以太口
E.這是一個PC機上網(wǎng)卡上的一個接口

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1.單項選擇題What is the maximum data rate specified for IEEE 802.11b WLANs?（）

A.10 Mbps
B.11 Mbps
C.54 Mbps
D.100 Mbps

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2.單項選擇題 根據(jù)下圖，假設所有路由器接口都配置正確且正常工作，假設R2上OSPF配置正確，配置在R1上默認路由會怎么影響R2的工作？（）

A.任何到達一個和路由器R1非直連的網(wǎng)絡的數(shù)據(jù)包都會被丟棄
B.任何到達一個和路由器R2非直連的網(wǎng)絡的數(shù)據(jù)包都會被丟棄
C.任何到達一個和路由器R2非直連的網(wǎng)絡的數(shù)據(jù)包都會即時被丟棄，因為R1上缺少網(wǎng)關
D.直連在R2上的網(wǎng)絡將不能夠和172.16.100.0，172.16.100.128，172.16.100.64這些子網(wǎng)通訊
E.任何目的地沒有在R2的路由表中的數(shù)據(jù)包，R2將會定向到R1，R1會發(fā)送哪個數(shù)據(jù)包到R2，這樣路由環(huán)路產(chǎn)生

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3.單項選擇題Which command enables RSTP on a switch？（）

A.spanning-tree mode rapid-pvst
B.spanning-tree uplinkfast
C.spanning-tree backbonefast
D.spanning-tree mode mst

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4.單項選擇題Why would a network administrator configure port security on a switch（）。

A.to prevent unauthorized Telnet access to a switch port
B.to limit the number of Layer 2 broadcasts on a particular switch port
C.to prevent unauthorized hosts from accessing the LAN
D.to protect the IP and MAC address of the switch and associated ports
E.to block unauthorized access to the switch management interfaces over common TCP ports

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5.單項選擇題Hosts on the same VLAN can communicate with each other but are unable to communicate with hosts on different VLANs. What is needed to allow communication between VLANs（）。

A.a switch with a trunk link that is configured between the switches
B.a router with an IP address on the physical interface that is connected to the switch
C.a switch with an access link that is configured between the switches
D.a router with subinterfaces configured on the physical interface that is connected to the switch

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