单选题LAN网络接口卡处于OSI参考模型的 (40) 。

单选题In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous systems. Typically, each deparlment or division has defined its own network needs (70) OS, LAN topology, communication protocols,applications, and other components.

单选题Filip是一种既寄生于文件中又侵占系统区的混合型病毒，下列关于其叙述中不正确的选项是______。

单选题DHCP服务器采用______报文将IP地址发送给客户机。

单选题光纤分为多模光纤和单模光纤，下面的选项中，属于单模光纤的是______。

单选题（ ） 不属于计算机病毒防治策略。

单选题操作系统的发展过程是 (16) 。 A．设备驱动程序组成的原始操作系统、管理程序、操作系统 B．原始操作系统、操作系统、管理程序 C．管理程序、原始操作系统、操作系统 D．管理程序、操作系统、原始操作系统

单选题在DHCP服务器配置文件dhcp.conf中，用于指定向某客户机分配固定的IP地址的参数是______。

单选题E1载波采用的复用方式是______，提供的数据速率是______。

单选题For each blank, choose the best answer from the four choices and write down on the answer sheet. Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (71) , and that it has a mechanism for (72) graphical files. Display text, display graphics, and (73) hyperlinks—there's 99 percent of the (74) value. That's not to say that the manufacturers didn't go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can't wait to delete from your favorites of bookmarks menu? Remember when client-side Java applets were supposed to become the preferred (75) for application development? Remember frames and all their nasty side effects?

单选题通常企业在信息化建设时需要投入大量的资金， 成本支出项目多且数额大

单选题在Windows的cmd命令行窗口中输入______命令后得到如下图所示的结果。

单选题通过改变载波信号相位值来表示数字0、1的方法称为______。 A．FSK B．PSK C．ASK D．ATM

单选题如果一个公司有1000台主机，则至少需要给它分配______个C类网络。为了使该公司的网络地址在路由表中只占一行，给它指定的子网掩码必须是______。这种技术叫作______技术。

单选题设有4个IP地址：129.47.16.254、129.47.17.1、129.47.32.254、129.47.33.1，如果子网掩码为255.255.240.0，则属于同一个子网的是______。 A．129.47.16.254和129.47.33.1 B．129.47.17.1和129.47.32.254 C．129.47.17.1和129.47.33.1 D．129.47.32.254和129.47.33.1