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單項選擇題What is the difference between a CSU/DSU and a modem?（）

A.A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line
B.A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line
C.A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line
D.A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line

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1.單項選擇題配置備份中心的目的是（）。

A.增加網(wǎng)絡(luò)帶寬
B.提高網(wǎng)絡(luò)可用性
C.降低網(wǎng)絡(luò)傳輸費用
D.防止數(shù)據(jù)傳輸意外中止

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2.多項選擇題路由器作為網(wǎng)絡(luò)互連設(shè)備，必須具備以下哪些特點？（）

A.支持路由協(xié)議
B.至少具備一個備份口
C.到少支持兩個網(wǎng)絡(luò)接口
D.協(xié)議至少要實現(xiàn)到網(wǎng)絡(luò)層
E.具有存儲、轉(zhuǎn)發(fā)和尋徑功能
F.至少支持兩種以上的子網(wǎng)協(xié)議

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3.多項選擇題關(guān)于MAC地址表示正確的是（）。

A.00-e0-fe-01-23-45
B.00e0.fe01.2345
C.00e.0fe.-012.345
D.00e0.fe112345

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4.單項選擇題The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command（）。

A.This command should be executed from the global configuration mode
B.The IP address 10.121.16.8 is the local router port used to forward data
C.102 is the remote DLCI that will receive the information
D.This command is required for all Frame Relay configurations
E.The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC

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5.多項選擇題Which three options are valid WAN connectivity methods? （）

A.PPP
B.WAP
C.HDLC
D.MPLS
E.L2TPv3
F.ATM

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