RIP协议引入路由保持机制的作用是______。

关于原型化开发方法的叙述中，不正确的是(6)。

以下关于DHCP协议的描述中，错误的是__________。(2010年下半年试题)

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. The key to SNMP(71)is its simplicity. It has a small command set that does a good job of collecting information from(72)any network device. In a SNMP environment,(73)of the work is handled by the network management system. Devices that are being managed are not(74)with processing(75)that might affect their performance.

关于自治系统(Autonomous　System，AS)，以下说法错误的是(26)。

With hundreds of millions of electronic transactions taking place daily, businesses and organizations have a strong incentive to protect the(66)of the data exchanged in this manner, and to positively ensure the identities of those involved in the(67). This has led to an industry-wide quest for better, more secure methods for controlling IT operations, and for deploying strong security(68)deeply and broadly throughout networked infrastructures and client devices. One of the more successful concepts to engage the imaginations of the security community has been the development of standards-based security.(69)that can be incorporated in the hardware design of client computers. The principle of encapsulating core security capabilities in(70)and integrating security provisions at the deepest levels of the machine operation has significant benefits for both users and those responsible for securing IT operations.

在网络的拓扑结构中，处于上层的结点称为(36)。只要有一个结点发生故障，网络通信就无法进行的结构是(37)；数据单方向传输的拓扑结构是(38)。(39)允许某些站点具有优先级。交换式局域网属于(40)。

《计算机软件产品开发编制指南》(GB　8567-1988)是(3)标准。

IPSec　VPN安全技术没有用到(35)。

对于选择重发ARQ协议，如果帧编号字段为k位，则窗口大小为__________。(2009年下半年试题)

OSI定义的网络管理员包括配置管理、故障管理、性能管理、计费管理和安全管理五大功能，下列操作中属于配置管理的是__________。(2008年下半年试题)

操作系统的存储管理对象主要是(30)。网络操作系统的主要任务是(31)。

Although a given waveform may contain frequencies over a very broad range，as a practical matter any transmission system will be able to accommodate only a limited band of (71) ．This，in turn，limits the data rate that can be carried on the transmission (72) ．Asquare wave has an infinite number of frequency components and hence an infinite (73) ．However, the peak amplitude of the kth frequency component，kf，is only 1/k，so most of the (74) in this wavefonn is in the first few fiequency components．In general，any digitalwaveform will have (75) bandwidth．If we attempt to transmit this waveform as a signalover any medium，the transmission system will limit the bandwidth that can be transmitte

__________确定了标准体制和标准化管理体制，规定了制定标准的对象与原则以及实施标准的要求，明确了违法行为的法律责任和处罚办法。(2006年下半年试题)

路由器命令“Router(config)#　access-list　1　permit　192.168.1.1”的含义是(57)。

为避免地址的浪费，在一条点到点的链路上子网掩码应该指定为(4)

按照802．1d生成树协议(STP)，在交换机互联的局域网中，__________的交换机被选为根交换机。(2011年上半年试题)

中央处理器包括(2)。

CSMA／CD协议可以利用多种监听算法来减小发送冲突的概率，下面关于各种监听算法的描述中，正确的是__________。(2009年下半年试题)

IGP的作用范围是______。