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單項選擇題V．24接口工作在同步方式下最高傳輸速率是（）。

A.64000 bps
B.115200 bps
C.2048000 bps
D.4096000 bps

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1.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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2.判斷題X.25作為國際通用標準的廣域網(wǎng)協(xié)議，內(nèi)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(zhì)量差的信道上傳輸數(shù)據(jù)。

參考答案：錯

3.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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4.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

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5.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(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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