第57題： （）存儲(chǔ)方式常使用多副本技術(shù)實(shí)現(xiàn)數(shù)據(jù)冗余。
A．DAS
B．NAS
C．SAN
D．分布式
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第58題： 結(jié)構(gòu)化布線系統(tǒng)中，實(shí)現(xiàn)各樓層設(shè)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(guān)于網(wǎng)絡(luò)需求分析的說(shuō)法中，錯(cuò)誤的是（）。
A．應(yīng)收集不同用戶(hù)的業(yè)務(wù)需求
B．根據(jù)不同類(lèi)型應(yīng)用的業(yè)務(wù)特性，歸納和梳理出各自的網(wǎng)絡(luò)需求
C．應(yīng)撰寫(xiě)輸出網(wǎng)絡(luò)系統(tǒng)規(guī)劃與設(shè)計(jì)報(bào)告
D．應(yīng)充分考慮數(shù)據(jù)備份的網(wǎng)絡(luò)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．a(chǎn)uthorized
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

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