下面关于几个网络管理工具的描述中，错误的是()。
- A.netstat可用于显示IP、TCP、UDP、ICMP等协议的统计数据
- B.sniffer能够使网络接口处于杂收模式，从而可截获网络上传输的分组
- C.winipcfg用MS-DOS工作方式显示网络适配器和主机的有关信息
- D.tracert可以发现数据包到达目标主机所经过的路由器和到达时间
正确答案及解析
正确答案
解析
netstat(network statistics)是一个命令行工具，用于显示网络连接、路由表和网络端口收发数据包的统计信息等。
*netstat -a：显示所有连接和监听端口。
*netstat -e：显示以太网统计信息。
*netstat -n：以数字形式显示网络地址和端口号。
*netstat -r：显示路由表。
*netstat -s：按协议显示统计信息，包括IP，ICMP，TCP和UDP等。
tracert命令的作用是跟踪数据包到达目标主机的路径，如果发现网络不通，可以用tracers跟踪数据包传输的路径，发现出故障的节点。例如：
winipcfg与ipconfig功能一样，用于显示主机中IP协议的配置信息，winipcfg适用于Windows 95／98，而ipconfig适用于Windows NT／2000／XP。winipcfg不使用参数，它以Windows窗口形式显示网络适配器的物理地址、主机IP地址、子网掩码及默认网关等配置信息。单击其中的“其他信息”按钮，可以查看主机名、DN5服务器和节点类型等。sniffer是一类程序的总称，即嗅探器，它可以通过计算机的网络接口，接收网络中传输的各种数据包，从而进行协议分析和通信流分析，解决网络维护和管理方面的问题。安装了sniffer的计算机，其网卡被设置为杂收(promiscuous)模式，这样就能截获网络上传输的任何数据包。与通常情况下的网卡不一样，通常的网卡默认只接收发送给自己的数据包，嗅探器可能被合法地使用，也可能被恶意地使用，网络黑客利用嗅探器程序，可以根据截获的数据包发现用户的账户信息，从而实施网络攻击活动。Sniffer(首写字母大写)是NetworkGenera。公司开发的最早的分组捕获和代码分析软件，用于网络通信分析和故障排除。
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