第58題： 三層網(wǎng)絡(luò)設(shè)計(jì)方案中，（  ）是核心層的功能。
A.不同區(qū)域的高速數(shù)據(jù)轉(zhuǎn)發(fā)
B.用戶(hù)認(rèn)證、計(jì)費(fèi)管理
C.終端用戶(hù)接入網(wǎng)絡(luò)
D.實(shí)現(xiàn)網(wǎng)絡(luò)的訪問(wèn)策略控制
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第59題： 五階段迭代周期模型把網(wǎng)絡(luò)開(kāi)發(fā)過(guò)程分為需求分析、通信規(guī)范分析、邏輯網(wǎng)絡(luò)設(shè)計(jì)、物理網(wǎng)絡(luò)設(shè)計(jì)、安裝和維護(hù)等五個(gè)階段。以下敘述中正確的是（  ）。
A.需求分析階段應(yīng)盡量明確定義用戶(hù)需求，輸出需求規(guī)范、通信規(guī)范
B.邏輯網(wǎng)絡(luò)設(shè)計(jì)階段設(shè)計(jì)人員一般更加關(guān)注于網(wǎng)絡(luò)層的連接圖
C.物理網(wǎng)絡(luò)設(shè)計(jì)階段要輸出網(wǎng)絡(luò)物理結(jié)構(gòu)圖、布線方案、IP地址方案等
D.安裝和維護(hù)階段要確定設(shè)備和部件清單、安裝測(cè)試計(jì)劃，進(jìn)行安裝調(diào)試
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第60題： 以下關(guān)于網(wǎng)絡(luò)冗余設(shè)計(jì)的敘述中，錯(cuò)誤的是（  ）。
A.網(wǎng)絡(luò)冗余設(shè)計(jì)避免網(wǎng)絡(luò)組件單點(diǎn)失效造成應(yīng)用失效
B.通常情況下主路徑與備用路徑承擔(dān)相同的網(wǎng)絡(luò)負(fù)載
C.負(fù)載分擔(dān)是通過(guò)并行鏈路提供流量分擔(dān)來(lái)提高性能
D.網(wǎng)絡(luò)中存在備用鏈路時(shí)，可以考慮加入負(fù)載分擔(dān)設(shè)計(jì)
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第62題： A virtual (  ) network, or VPN, is an encrypted connection over the Internet from a device to a network. The encrypted connection helps ensure that sensitive data is safely (  ). It prevents (  ) people from eavesdropping on the traffic and allows the user to conduct work remotely. Traffic on the virtual network is sent securely by establishing an encrypted connection across the Internet known as a (  ).A remote access VPN securely connects a device outside the corporate office. A site-to-site VPN connects the corporate office to branch offices over the Internet. Site-to-site VPNs are used when distance makes it impractical to have direct network connections between these offices. Think of site-to-site access as (  ) to network.
（1）A. public
B. private
C. personal
D. proper
（2）A. encoded
B. encrypted
C. stored
D. transmitted
（3）A. employed
B. authorized
C. unauthorized
D. criminal
（4）A. channel
B. path
C. tunnel
D. route
（5）A. network
B. device
C. computer
D. endpoin
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