思科网院杯决赛排错题目解题思路
思科网院杯决赛排错题目解题思路2010年07月26日星期一21：55今天看了去年的思科网院杯网络技术大赛的决赛排错题目，感觉挺简单，事实上做的很不好，思路没在出题的路上，研究了下，写下自己总结的思路~！希望能在决赛的时候有帮助。
职场英语网实验拓扑：
Cities Spokane and St Paul are looking into connecting each others LANS togther.
The WAN connection us two rial lines：
Primary Link：Serial 0/0/1 is using abit rate of 128kbps and HDLC encapsulation.
Backup Link：Serials 0/0/0 is using abit rate of 64kbps and PPP encapsulation Each LAN has 15 hosts with no plans for expansion St Paul has aTFTP rver(200.1.1.130/27)that is needed to share router IOS images,all 1841 routers should u"c1841-adviprvicesk9-mz.124-15.T1.bin".
The network is using static routing and EIGRP(AS 100).
Spokane is using 802.1q on the FastEthernet interface and subinterfaces are numbered according toVLAN 100(fa0/0.1)and
200(fa0/0.2).
Part 0
The IT staff reported Router"St-Paul"ems broken for unknown reason,and need your help to fix it.
图片英文Part A
*U the chart and the information above to configure the devices.
Device hostnamePortIP Address Spokanes0/0/0200.1.1.62/27
s0/0/1200.1.1.94/27 fa 0/0.1200.1.1.190/27 fa 0/0.2200.1.1.126/27 St-Pauls0/0/02 00.1.1.33/27 s0/0/1200.1.1.65/27 fa 0/0200.1.1.129/27 Spokane-SWVLAN 1200.1.2.1/24 TFTP-ServerEthernet 0200.1.1.130/27
*Turn off CDP on all routers.
*Configure Passwords usingGOODfor vty password on all devices,do not t password to console
*Uciscoas theenable passwordon all devices
*Create aMOTD Banner that says：No Unauthorized Accesson 1841 routers only Part Two Configure Routing and Security
*Configure EIGRP AS 100 on both routers Suppress routing updates on all interfaces,exceptfor rial interfaces.
Donotu ACLs for this purpo,and donotu"passive-interface default"for this.
EIGRP should adverti all directly connected interfaces,do not u redistribution for this purpo.
*Configure the switch using the information shown in the IP chart and on the topology.
*Create an extended named access list"STOP".
It is todeny urs in VLAN 100from accessingHTTPSandSSHin all other networks,but allow all other IP protocols.
ysw啥意思
The ACL can only have3 lines,and you should follow the common practice of extented ACL to deploy it.
If you have made all this work,Then you have completed the contest.Congratulations！
*Wireless LAN-Configure Linksys wireless router Internet Connection Type：Static IP Internet IP Address and Mask：
200.1.1.120/27 Default Gateway：200.1.1.126 DNS：200.1.1.130 SSID："Cisco"
Enable DHCP for wireless client Maxium number of ur：50 Start IP address：192.168.0.100 U WEP as Security Mode,key1 is"1234567890"
Make sure PC0 can connect to wireless router and obtain aIP via DHCP Make sure you can can ping 200.1.1.130 from PC0 and PC1(plea assign aIP address within proper range manually)
题目是复赛题目的配置进过破坏后的。下面说下解题的思路：
排错主要是对路由器、交换机的配置、PC的IP参数配置进行错误分析。路由器配置分析主要包括接口IP配置、封装、子网掩码、时钟；路由器的参数包括vty、console的配置；路由协议的检查包括通告
网络检查、AS区域、area检查show ip protocols，检查排除完毕后通过show ip route查看路由表是否收敛、通过show ip eigrp neighbor、show ip ospf neighbor检查邻居路由是否互相建立邻居关系。另外还包括单臂路由器子接口vlan的封装、帧中继DLCI的映射、PPP PAP chap认证的检查。这一切需要重要的命令：show running-config进行检查，再使用上述其他命令进行辅助检查。
哈尔滨英语学校交换机的排错主要包括接口配置和交换机STP、VTP等配置分析。接口主要包括交换机接口的工作模式，是trunk还是access模式。trunk模式判断本征vlan是否匹配、access模式判断接口配置的vlan(show vlan)、端口安全
(show port-curity)。VTP排错主要包括VTP域、密码、模式的检查(show
vtp status)
舌尖上的英国当然排错还包括DHCP、NAT、ACL的排错，特别是ACL，看准要求写准语句，设置好进出接口尤为重要！
STP的排错没涉及过，大致也就是vlan的优先级根桥修改的内容。(show spanning-tree)
PC机的排错主要包括IP、子网掩码、网关和DNS的排错，一定要认真检查！有些题目故意把IP或者掩码设置得接近迷惑做题者。
交换机与路由器、路由器与PC间的物理介质检查，特别是PC与路由器间、路由器与AP使用Copper Cross-Over线缆。如果设备间的接口启用但线缆两端为红色一般检查线缆是否匹配。
设备排错"万能"命令：show running-config
下面就通过决赛排错题目为例子，进行排错。
1.物理链路的检查，通过肉眼表面观察线缆正确。
2.设备的配置观察金融英语词汇
Spokane#sh runn Building configuration.performance是什么意思
Current configuration：1423 bytes
明确英语！
version 12.4 no rvice timestamps log datetime mc no rvice timestamps debug datetime mc no rvice password-encryption
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hostname Spokane
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enable password cisco ！
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l是什么意思
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ip ssh version 1
新目标七年级上册英语教案！
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