● Melissa and Love Letter 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 with Melissa and several other similar email __(72)___.Upon　running ,such worms usually proceed to send themselves out to email addresses from the victim's address book, previous emails, web pages__(73)___.As administrators seek to block dangerous email attachments through the recognition of well-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 will still run and successfully infect target users.Frequently ,hackers try to penetrate networks by sending an attachment that looks like a flash movie ,which, while displaying some cute animation ,simultaneously runs commands in the background 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　to dynamically 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　incoporporated back into the presented ___(67)____.DOM is a ___(68)___-based API to　documents ,which requires the whole document to be represented in ____(69)___while　processing it .A simpler alternative to 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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