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單項選擇題For security reasons, the network administrator needs to prevent pings into the corporate networks from hosts outside the internetwork. Which protocol should be blocked with access control lists（）。

A.IP
B.ICMP
C.TCP
D.UDP

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1.單項選擇題對于一個沒有經(jīng)過子網(wǎng)劃分的傳統(tǒng)C類網(wǎng)絡來說，允許安裝多少臺主機？（）

A.1024
B.65025
C.254
D.16
E.48

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2.單項選擇題下列哪一個命令用于指定物理接口做備份接口？（）

A.[Quidway]#standby interface s0
B.[Quidway-Serial1]#standby interface s0

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3.多項選擇題Which two features did WPAv1 add to address the inherent weaknesses found in WEP?（）

A.a stronger encryption algorithm
B.key mixing using temporal keys
C.shared key authentication
D.a shorter initialization vector
E.per frame sequence counters

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4.單項選擇題ISDN基本速率接口（BRI）速率是（）。

A.16kbps
B.64kbps
C.144kbps
D.2048kbps

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5.單項選擇題What should be part of a comprehensive network security plan（）。

A.Allow users to develop their own approach to network security
B.Physically secure network equipment from potential access by unauthorized individuals
C.Encourage users to use personal information in their passwords to minimize the likelihood of passwords being forgotten
D.Delay deployment of software patches and updates until their effect on end-user equipment is well known and widely reported
E.Minimize network overhead by deactivating automatic antivirus client updates

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