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● 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 proceed tosend 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 andwill still run and successfully infect target users.    Frequently, hackers try to penetrate networks by sending an attachment that looks like aflash movie, which, while displaying some cute animation, simultaneously runs commands inthe background to steal your passwords and give the  (75)  access to your network.

发布时间:2024-07-09

A.attachment

B.packet

C.datagram

D.message

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 befurther processed and the results of that processing can be incorporated back into thepresented  (67) . DOM is a  (68) -based API to documents, which requires the wholedocument to be represented in  (69)  while processing it. A simpler alternative to DOM is theevent-based SAX, which can be used to process very large  (70)  documents that do not fitinto 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

    开始考试点击查看答案
  • 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

    开始考试点击查看答案
  • 6●在计算机中,最适合进行数字加减运算的数字编码是_____(1)_____,最适合表示浮点数阶码的数字编码是____(2)____。

    A.原码

    B.反码

    C.补码

    D.移码

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  • 7●如果主存容量为16M字节,且按字节编址,表示该主存地址至少应需要_____(3)____位。

    A.16

    B.20

    C.24

    D.32

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  • 8●操作数所处的位置,可以决定指令的寻址方式。操作数包含在指令中,寻址方式为___(4)___;操作数在寄存器中,寻址方式为_____(5)_____;操作数的地址在寄存器中,寻址方式为____(6)_____。

    A.立即寻址

    B.直接寻址

    C.寄存器寻址

    D.寄存器间接寻址

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  • 9●在计算机系统中,构成虚拟存储器___(8)____。

    A.只需要一定的硬件资源便可实现

    B.只需要一定的软件即可实现

    C.既需要软件也需要硬件方可实现

    D.既不需要软件也不需要硬件

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  • 10●某公司使用包过滤防火墙控制进出公司局域网的数据,在不考虑使用代理服务器的情况下,下面描述错误的是“该防火墙能够___(9)____”。

    A.使公司员工只能访问Internet上与其有业务联系的公司的IP地址

    B.仅允许HTTP协议通过

    C.使员工不能直接访问FTP服务器端口号为21的FTP地址

    D.仅允许公司中具有某些特定IP地址的计算机可以访问外部网络

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