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單項選擇題 網(wǎng)絡(luò)管理員通常建立一個telnet會話與主機A.交換機然而，主機A不可用。管理員試圖從主機B的交換機發(fā)生故障，但ping其他兩臺主機是成功的。是什么問題？（）

A.主機B與交換機必須在同一個子網(wǎng)
B.該交換機分配的需要和適當?shù)哪J網(wǎng)關(guān)
C.連接到路由器，交換機接口關(guān)閉
D.主機B需要在VLAN1被分配一個IP地址
E.交換機接口需要分配相應的IP地址

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1.單項選擇題A network administrator is planning a network installation for a large organization.The design requires 100 separate subnetworks，so the company has acquired a Class B network address.What subnet mask will provide the 100 subnetworks required， if 500 usable host addresses are required per subnet？（）

A.255.255.240.0
B.255.255.248.0
C.255.255.252.0
D.255.255.254.0
E.255.255.255.0
F.255.255.255.192

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2.單項選擇題Which command displays the CHAP authentication process as it occurs between two routers?（）

A.debug authentication
B.debug chap ppp
C.debug chap authentication
D.debug ppp authentication

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3.單項選擇題Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch over FastEthernet？（）

A.802.3ad
B.802.1w
C.802.1Q
D.802.1d

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4.單項選擇題At which layer of the OSI model dose PPP perform?（）

A.Layer 3
B.Layer 4
C.Layer 2
D.Layer 5

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5.多項選擇題The network technician is planning to use the 255.255.255.224 subent mask on the network.which three valid IP addresses can the technician use for the hosts？（）

A.172.22.243.127
B.172.22.243.191
C.172.22.243.190
D.10.16.33.98
E.10.17.64.34
F.192.168.1.160

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