01第一课：路由器硬件介绍和基本使用 思科认证网络助理工程师CCNA培训PPT资料.pptVIP

路由器基础 外部配置方式 配置信息可以来自多种方式 内部结构元件 RAM ：储存当前运行内容 路由器模式 路由器状态命令 show running-config 命令与show startup-config 命令 10.3 或 10.3以前 用 write terminal 命令 10.3 或 10.3以后 用 Use show config 命令 show interface serial 命令 show version 命令 show version 命令 show protocols 命令 telnet 操作 基本测试 测试概述 测试应用层用 telnet 是否能访问远程的路由器？ 用 ping 命令测试 数据报是否被转发？ 用 trace 命令测试 从哪条路径转发数据报？ 用 show ip route命令 路由表中是否存在入口? 链接是否正常? 电缆 连接器 接口 载波检测信号是否存在? show interface serial解释过程 清除show interface 的计数器 用 debug 检查实时的流量 什么协议消息正在被发送? Logging 消息 总结 路由器是由可配置的元件组成 路由器有检查、维护、改变元件的模式 用 Show 命令检查 用CDP 显示邻居的入口 用 Telnet访问路由器 一层一层的测试网络的连通性 测试命令包括： ping, trace,与 debug Router status commands are as follows: show version桪isplays the configuration of the system hardware, the software version, the names and sources of configuration files, and the boot images. show processes桪isplays information about the active processes. show protocols桪isplays the configured protocols. This command shows the status of any configured Layer 3 (network) protocol. show mem桽hows statistics about the router抯 memory, including memory free pool statistics. show stacks桵onitors the stack use of processes and interrupt routines and displays the reason for the last system reboot. show buffers桺rovides statistics for the buffer pools on the network server. show flash桽hows information about the Flash memory device. show running-config (write term on Cisco IOS Release 10.3 or earlier)桪isplays the active configuration file. show startup-config (show config on Cisco IOS Release 10.3 or earlier)桪isplays the backup configuration file. show interfaces桪isplays statistics for all interfaces configured on the router. The show running-config and show startup-config commands are among the most used Cisco IOS software EXEC commands because they allow an administrator to see the current running configuration on the router or the image size and startup configuration commands the router will use on the next restart. Note: The commands write term and show config used with Cisc