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1、计算机网络应用技术结课作业工程背景了解计算机网络的运行原理并能自主设计模拟局域网及广域网 的运行是作为网络工程专业学生必须掌握的能力，通过自主设 计网络拓扑能增进自己对实际路由交换网络运行的理解。设计思想本实验模拟简单局域网内路由交换网络的运行及与广域网的通 信。ip分配网络设备PCOPC1PC2R1R2R3IP地址四、拓扑图五、配置交换机部分：三台交换机之间配置vtp,其中sw2配置为Server, swO和swl配置为client,通过在sw2建立vlanlO和vlan20实现在三台交换机上全部配置vlan。相关命令如下：Sw3(config)#vtp mode server Device
2、 mode already VTP SERVER. Sw3(config)#vtp domain cisco Domain name already set to cisco.Sw3(config)#vtp pass cisco Password already set to cisco将交换机连接pc的接口都配置为access模式以实现将相应接口 划入pc所属vlan；将交换机之间相连的接口及交换机与路由器 相连的接口都配置为trunk模式以实现传输多个vlan流量。相应配置如下：SwO：interface FastEthernetO/1 switchport access vlan 10
3、switchport mode access interface FastEthernetl/1 switchport mode trunk interface FastEthernet2/l switchport mode trunk interface FastEthernet3/l switchport access vlan 20 switchport mode accessSwl ：interface FastEthernetO/1 switchport access vlan 20 switchport mode access interface FastEthernetl/1 s
4、witchport mode trunk: interface FastEthernet2/l switchport mode trunkSw2：interface FastEthernetO/1 switchport mode trunkinterface FastEthernetl/1interface FastEthernet2/l switchport mode trunk通过命令spanning-tree mode pvst命令在三台交换机上配置 pvst+并让交换机自动选举根桥，防止二层环路。路由器部分：R1：在FaO/1物理接口上开启子接口 Fa0/0.10话Fa0/0.20分别
5、 作为vlanlO和vlan20所属pc的网关以实现单臂路由。interface FastEthernetO/O .p.0interface FastEthernetO/O.20RI和R2模拟内部路由网络。在R1和R2上配置OSPF并宣告 相应网络。R1：router ospf 1 router-id 1.1.1.1 log-adjacency-changes network 192.168.10.0 0.0.0.255 area 0 network 192.168.20.0 0.0.0.255 area 0 network 12.1.1.0 0.0.0.255 area 0R2：router
6、 ospf 1 router-id 2.2.2.2 log-adjacency-changes network 12.1.1.0 0.0.0.255 area 0 network 23.1.1.0 0.0.0.255 area 0R3模拟Internet,因此R2作为内部网络的边界需要在连接外网 的FaO/1端口作NATo并在R2上配置了一个ACL阻止pc2访问外网，配置如下:ip nat pool out 23.1.1.10 23.1.1.20 netmask 255.255.255.0 ip nat inside source list 2 pool out overload ip cla
7、ssless ,ip flow-export version 9 access-list 1 permit any六、结果分析最后的实验结果显示，pc之间可以互相ping,各pc也可以ping通其所属网关，如下所示：PCO ping其网关:Pinging 192.168.10.1 with 32 bytes of data:Reply from 192.168.10.1:Reply from 192.168.10.1:Reply from 192.168.10.1:Reply from 192.168.10.1:bytes=32 time=13ms TTL=255bytes=32bytes=3
8、2bytes=32time=0mstime=0mstime=0msTTL=255TTL=255TTL=255Ping statistics for 192.168.10.1:Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),PCO ping pc2：Pinging 192.168.20.3 with 32 bytes of data:Request timed out.Reply from 192.168.20.3: bytes=32 time=0ms TTL=127Reply from 192.168.20.3: bytes=32 tim
9、e=10ms TTL=127Reply from 192.168.20.3: bytes=32 time=llms TTL=127Ping statistics for 192.168.20.3:Packets: Sent = 4, Received = 3, Lost = 1 (25% loss)JPCO ping 外网：?Cping 3.3.3.3Pinging 3.3.3.3 with 32 bytes of data:Request timed out.eply from 3.3.3.3: bytes=32 time=Oms TTL=253 eply from 3.3.3.3: byt
10、es=32 time=Oms TTL=253 Xeply from 3.3.3.3: bytes=32 time=Oms TTL=253而pc2无法ping通外网:Pinging 3.3.3.3 with 32 bytes of data:Reply from 12.1.1.2:Reply from 12.1.1.2:Reply from 12.1.1.2:Reply from 12.1.1.2:Destination host unreachable.Destination host unreachable.Destination host unreachable.Destination host unreachable.Ping statistics for 3.3.3.3:Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),