第57題： （）存儲方式常使用多副本技術實現數據冗余。
A．DAS
B．NAS
C．SAN
D．分布式
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第58題： 結構化布線系統(tǒng)中，實現各樓層設備間子系統(tǒng)互聯(lián)的是（）。
A．管理子系統(tǒng)
B．干線子系統(tǒng)
C．工作區(qū)子系統(tǒng)
D．建筑群子系統(tǒng)
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第59題： 以下關于網絡需求分析的說法中，錯誤的是（）。
A．應收集不同用戶的業(yè)務需求
B．根據不同類型應用的業(yè)務特性，歸納和梳理出各自的網絡需求
C．應撰寫輸出網絡系統(tǒng)規(guī)劃與設計報告
D．應充分考慮數據備份的網絡需求
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第61題： Network firewalls are security devices used to stolo or mitigate() access to private networks connected to the lnternet, especially intranets. The only traffic allowed on the network is defined via firewall ()-any other traffic attempting to access the network is blocked. Networkfirewalls sit at the () line of a network, acting as a communications liaison between intenal and extenal devices, When properly configured, a firewall allows users to access any of the resources they need while simultaneously keeping out unwanted accesses. In addition to limiting access to a protected computer and network, a firewall can () all traffic coming into or leaving a network, and manage remote access to a private network through seccure authentication certificates and logins. () firewalls examine every packet that passes through the network and then accept or deny it as defined by rules set by the user.
A．Unauthorized
B．authorized
C．normal
D．frequent
A．Ports
B．policies
C．commands
D．status
A．Front
B．back
C．second
D．last
A．Reply
B．block
C．log
D．encrypt
A．Application-layer
B．Packet filtering
C．Circuit-level
D．Proxy server

答案解析與討論：www.xomuzic.com/st/5374921435.html