判斷題X.25作為國際通用標準的廣域網(wǎng)協(xié)議，內置的差錯糾正，流量控制和丟包重傳機制使之具有高度的可靠性，由于數(shù)據(jù)吞吐率很低，包時延較大，故不適于在質量差的信道上傳輸數(shù)據(jù)。

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1.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

2.單項選擇題配置備份中心的目的是（）。

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

3.多項選擇題路由器作為網(wǎng)絡互連設備，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)絡接口
D.協(xié)議至少要實現(xiàn)到網(wǎng)絡層
E.具有存儲、轉發(fā)和尋徑功能
F.至少支持兩種以上的子網(wǎng)協(xié)議

4.多項選擇題關于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

5.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