单选题接收告警事件、分析相关信息、及时发现正在进行的攻击等事件的捕捉和报告操作是由管理代理通过 SNMP的 (46) 报文传输给管理进程的。

单选题在网络中分配 IP 地址可以采用静态地址或动态地址方案。下面关于两种地址分配方案的论述中错误的是（ ）。

单选题搭建试验平台、进行网络仿真是网络生命周期中______阶段的任务。

单选题图8-5给出了不同类型IPSec数据包的封装示意图。其中，(40)工作在隧道模式；(42)只支持报文源身份认证和数据完整性服务，不支持报文加密服务。

单选题A transport layer protocol usually has several responsibilities．One is to create a process-to-process communication；UDP uses (71) numbers to accomplish this．Another responsibility is to providecontrol mechanisms at the transport level．UDP does this task at a very minimal level．There is no flowcontrol mechanism and there is no (72) for received packet．UDP, however,does provide errorcontrol to some extent．If UDP detects an error in the received packet，it will silently drop it． The transport layer also provides a connection mechanism for the processes．The (73) must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (74) station to make the connection with the receiver,chop the stream into transportable units，numberthem，and send them one by one．It is the responsibility of the transport layer at the receiving end to waituntil all the different units belonging to the same process have arrived，check and pass those that are (75) flee，and deliver them to the receiving process as a stream．

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. 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.

单选题BGP-4协议交换路由信息的节点数是以______为单位。 A．主干路由器数 B．区域(area)数 C．边界路由器数 D．自治系统数

单选题海明码是一种纠错码，其方法是为需要校验的数据位增加若干校验位，使得校验位的值决定于某些被校位的数据，当被校数据出错时，可根据校验位的值的变化找到出错位从而纠正错误

单选题在NetWare中，当工作站用户请求将数据和文件写入硬盘时，先将其写入内存缓冲区，然后以后台方式写入磁盘中，称为 (6) 。

单选题我国企业M与美国公司L进行技术合作，合同约定M使用一项在有效期内的美国专利，但该项美国专利未在我国和其他国家提出申请。对于M销售依照该专利生产的产品，以下叙述正确的是______。

单选题下图中主机A和主机B通过三次握手建立TCP连接，图中(1)处的状态是______，图(2)处的数字是______。三次握手建立TCP连接

单选题Cisco路由器操作系统IOS有三种命令模式，其中不包括______。

单选题假设模拟信号的最高频率为5MHz，采样频率必须大于 (14) ，才能使得到的样本信号不失真，如果每个样本量化为256个等级，则传输的数据速率是 (15) 。