● Melissa and LoveLetter made use of the trust that exists between friends or colleagues.Imagine receiving an __(71)___from a friend who asks you to open it. This is what happens withMelissa and several other similar email __(72)___.Upon running ,such worms usually proceedto send themselves out to email addresses from the victim's address book, previous emails, webpages__(73)___.    As administrators seek to block dangerous email attachments through the recognition ofwell-known ___(74)____,virus writers use other extensions to circumvent such protection.Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and willstill run and successfully infect target users.    Frequently ,hackers try to penetrate networks by sending an attachment that looks like a flashmovie ,which, while displaying some cute animation ,simultaneously runs commands in thebackground to steal your passwords and give the __(75)__access to your network.

试卷相关题目

• 1● DOM is a platform-and language-____(66)___API that allows programs and scripts  todynamically  access  and  update  the  content,  structure  and  style  of  WWW  documents(  currently,definitions for HTML and XML documents are part of the specification ).The document can be further processed and the results of that processing can be  incoprporated backinto the presented ___(67)____.DOM is a ___(68)___-based API to  documents ,which requiresthe whole document to be represented in ____(69)___while processing it .A simpler alternativeto  DOM  is  the  event  –based  SAX,which  can  be    used  to  process  very  large___(70)___documents that do not fit info the memory  available for processing.

  A.specific

  B.neutral

  C.contained

  D.related

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• 2● 在以下网络应用中，要求带宽最高的应用是___(65)___。

  A.可视电话

  B.数字电视

  C.拨号上网

  D.收发邮件

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• 3● 在TCP/IP 网络中，为各种公共服务保留的端口号范围是__(64)____。

  A.1～255

  B.1～1023

  C.1～1024

  D.1～65535

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• 4● 以下选项中，可以用于Internet 信息服务器远程管理的是____(63)____。

  A.Telnet

  B.RAS

  C.FTP

  D.SMTP

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• 5● 一个局域网中某台主机的IP 地址为176.68.160.12，使用22 位作为网络地址，那么该局域网的子网掩码为_____(61)____，最多可以连接的主机数为____(62)_____。

  A.255.255.255.0

  B.255.255.248.0

  C.255.255.252.0

  D.255.255.0.0

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