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ospf命令集英文版，学习CCNP和CCIE必备的资料，本人也正在学习CCNP，现在共享此命令集，希望能够与大家一起学习和交流。

RIP的防环机制：1、水平分割：A、水平分割：从接口收到的路由信息，不再从本接口发出。 B、毒性逆转的水平分割：从本接口收到的路由信息，转发 表示为16跳不可达。（防路由和IP包的环路） 2、最大跳数：最大跳数为15跳，16条不可达。（防路由环路） 3、抑制计时器：A、保持失效计时器：180秒 B、删除计时器：240秒。（在IP包上防止环路） 更新时间：30秒。异步更新为25~35秒，同步更新为25.5~30秒。

1.What is the correct order for the OSI model?P=Presentation, S=Session, D=Datalink, Ph=Physical, T=Transport, A= Application, N=NetworkA. P S A PH D N T    B. A P S T N D PHC. PH D N T A S P    D. P S A T N D PHAnswer B. It is crucial you not only memorize this and know what each layer does.2. What is encapsulation?A. Putting the header on an incoming frameB. Putting a header on an incoming segmentC. Putting a header on an outgoing frameD. Putting a header on an outgoing bitAnswer C. This also includes trailers and can be put on segments, packets, and frames.

Router>en Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line con 0 r1(config)#line con 0 r1(config-line)#logg sy r1(config-line)#exec-t 00 r1(config-line)#exi r1(config)#int f0/1 r1(config-if)#ip add 12.1.1.1 255.255.255.0 r1(config-if)#no sh r1(config-if)#exi 00:02:17: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up 00:02:18: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up //开始配置DHCP r1(config)#service dhcp r1(config)#no ip dhcp conflict logging r1(config)#ip dhcp excluded-address 12.1.1.1 r1(config)#ip dh pool fuck r1(dhcp-config)#network 12.1.1.0 255.255.255.0 r1(dhcp-config)#default-router 12.1.1.2 r1(dhcp-config)#domain-name cisco.com r1(dhcp-config)#dns-server 100.1.1.1 r1(dhcp-config)#lease 1 r1#sh ip dh bin IP address Hardware address Lease expiration Type 12.1.1.2 0063.6973.636f.2d63. Mar 02 1993 12:05 AM Automatic 3830.312e.3039.6538. 2e30.3031.302d.4574. 312f.30

Router(config)#no ip domain-lo Router(config)#line con 0 Router(config-line)#logg sy Router(config-line)#exec-t 0 0 Router(config-line)#exi Router(config)#ho R1 R1(config)#int s1/0 R1(config-if)#encapsulation fr R1(config-if)#no fram inv R1(config-if)#ip add 12.1.1.1 255.255.255.0 R1(config-if)#no shut R1(config-if)#frame-relay map ip 12.1.1.2 102 broadcast R1(config-if)#exi R1(config)#exi R1# R1#show ip int bri Interface IP-Address OK? Method Status Protocol Ethernet0/0 unassigned YES unset administratively down down Ethernet0/1 unassigned YES unset administratively down down Ethernet0/2 unassigned YES unset administratively down down Ethernet0/3 unassigned YES unset administratively down down Serial1/0 12.1.1.1 YES manual up up Serial1/1 unassigned YES unset administratively down down Serial1/2 unassigned YES unset administratively down down Serial1/3 unassigned YES unset administratively down down R1# Router#conf t Router(config)#no ip domain-lo Router(config)#line con 0 Router(config-line)#logg sy Router(config-line)#exec-t 0 0 Router(config-line)#exi Router(config)#ho R2 R2(config)#int s1/0 R2(config-if)#en fr R2(config-if)#no fram inv R2(config-if)#ip add 12.1.1.2 255.255.255.0 R2(config-if)#no shut R2(config-if)#exi R2(config)#i R2(config)#exi R2#show ip int bri Interface IP-Address OK? Method Status Protocol Ethernet0/0 unassigned YES unset administratively down down Ethernet0/1 unassigned YES unset administratively down down Ethernet0/2 unassigned YES unset administratively down down Ethernet0/3 unassigned YES unset administratively down down Serial1/0 12.1.1.2 YES manual up up Serial1/1 unassigned YES unset administratively down down Serial1/2 unassigned YES unset administratively down down Serial1/3 unassigned YES unset administratively down down R2#conf t R2(config)#int s1/0 R2(config-if)#frame-relay map ip 12.1.1.1 201 broadcast R2(config-if)#exi R2(config)#exi R2#ping 12.1.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 12.1.1.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 16/44/80 ms R2#

Router>en Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#ho r1 r1(config)#line con 0 r1(config-line)#logg sy r1(config-line)#exec-t 00 r1(config-line)#exi r1(config)#int s1/2 r1(config-if)#en r1(config-if)#encapsulation ppp r1(config-if)#ppp authentication chap r1(config-if)#exi r1(config)#username xiaoan password aa r1(config)#int s1/2 r1(config-if)#ip add 12.1.1.1 255.255.255.0 r1(config-if)#no sh r1(config-if)# *Mar 1 00:01:57.171: %LINK-3-UPDOWN: Interface Serial1/2, changed state to up r1(config-if)# *Mar 1 00:02:38.923: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to up r1(config-if)#end r1#sh run Building configuration... *Mar 1 00:02:58.663: %SYS-5-CONFIG_I: Configured from console by console Current configuration : 1078 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname r1 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! username xiaoan password 0 aa ! ! ! ! ! ! ! interface Ethernet0/0 no ip address shutdown half-duplex ! interface Ethernet0/1 no ip address shutdown half-duplex ! interface Ethernet0/2 no ip address shutdown half-duplex ! interface Ethernet0/3 no ip address shutdown half-duplex ! interface Serial1/0 no ip address shutdown serial restart-delay 0 ! interface Serial1/1 no ip address shutdown serial restart-delay 0 ! interface Serial1/2 ip address 12.1.1.1 255.255.255.0 encapsulation ppp serial restart-delay 0 ppp authentication chap ! interface Serial1/3 no ip address shutdown serial restart-delay 0 ! ip http server no ip http secure-server ! ! ! ! ! ! control-plane ! ! ! ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 logging synchronous line aux 0 line vty 0 4 ! !

Router>en Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#ho r1 r1(config)#line con 0 r1(config-line)#logg sy r1(config-line)#exec-t 00 r1(config-line)#exi r1(config)#int s1/2 r1(config-if)#ip add 12.1.1.1 255.255.255.0 r1(config-if)#no sh r1(config-if)#int lo0 *Mar 1 00:00:57.927: %LINK-3-UPDOWN: Interface Serial1/2, changed state to up *Mar 1 00:00:58.931: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to up *Mar 1 00:00:59.607: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up r1(config-if)#ip add 1.1.1.1 255.255.255.0 *Mar 1 00:01:24.435: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to down *Mar 1 00:02:04.431: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to up r1(config-if)#exi r1(config)#router os 10 r1(config-router)#router-id 1.1.1.1 r1(config-router)#net 12.1.1.1 0.0.0.0 area 0 r1(config-router)#net 1.1.1.1 0.0.0.0 area 0 *Mar 1 00:03:50.707: %OSPF-5-ADJCHG: Process 10, Nbr 2.2.2.2 on Serial1/2 from LOADING to FULL, Loading Done r1(config-router)#end *Mar 1 00:04:37.359: %SYS-5-CONFIG_I: Configured from console by console r1#ping 3.3.3.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 20/56/100 ms

#ho r1 no ip domain-lookup line con 0 logg sy exec-t 0 0 exi ipv6 unicast-routing ipv6 router ospf 100 int s1/2 ipv6 add 4000::1/64 no sh int lo0 ipv6 add 5000::1/64 ipv6 router ospf 100 router-id 1.1.1.1 int lo0 ipv6 ospf 100 area 0 int s1/2 ipv6 os 100 a 0

Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#ho r12 r12(config)#ho r1 r1(config)#no ip do r1(config)#no ip domain-lo r1(config)#no ip domain-lookup r1(config)#line con 0 r1(config-line)#logg sy r1(config-line)#exec-t 00 r1(config-line)#exi r1(config)# r1(config)# r1(config)# r1(config)# r1(config)# r1(config)# r1(config)# r1(config)# r1(config)# r1(config)# r1(config)# r1(config)# r1(config)# r1(config)# r1(config)# r1(config)#int s1/2 r1(config-if)#ip add 12.1.1.1 255.255.255.0 r1(config-if)#no sh r1(config)#router ei 10 r1(config-router)#no au r1(config-router)#no auto-summary r1(config-router)#net 12.1.1.0 0.0.0.255 r1(config-router)# r1(config-router)# r1(config-router)# r1(config-router)# *Mar 1 00:06:38.539: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor 12.1.1.2 (Serial1/2) is up: new adjacency r1(config-router)# r1(config-router)# r1(config-router)# r1(config-router)# r1(config-router)# r1(config-router)# r1(config-router)# r1(config-router)#end r1#telnet 23.1.1.2 *Mar 1 00:07:27.839: %SYS-5-CONFIG_I: Configured from console by console r1#telnet 23.1.1.2 Trying 23.1.1.2 ... Open User Access Verification Username: xiaoan Password: r3>en % No password set r3> r3> r3> r3>en Password: r3# r3# r3# r3# r3#exi [Connection to 23.1.1.2 closed by foreign host] r1# r1# r1# r1# r1# r1# r1# r1# r1# r1# r1# r1#telnet 23.1.1.2 Trying 23.1.1.2 ... Open User Access Verification Username: xiaoan Password: r3>exi [Connection to 23.1.1.2 closed by foreign host] r1# r1# r1# r1# r1# r1# r1# r1#telnet 23.1.1.2 Trying 23.1.1.2 ... % Destination unreachable; gateway or host down r1#telnet 23.1.1.2 Trying 23.1.1.2 ... % Destination unreachable; gateway or host down r1#ping 23.1.1.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 23.1.1.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 32/106/184 ms

ccna实验之单笔路由，用的是工大的模拟器。Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#ho R1 R1(config)#no ip domain-lo R1(config)#line con 0 R1(config-line)#logg sy R1(config-line)#exec-t 0 0 R1(config-line)#exi R1(config)#int f0/0 R1(config-if)#no shut R1(config-if)#exi R1(config)#int f0/0.10 R1(config-subif)#encapsulation dot1Q 10 R1(config-subif)#ip add 10.1.1.1 255.255.255.0 R1(config-subif)#exi R1(config)#int f0/0.20 R1(config-subif)#encapsulation dot1Q 20 R1(config-subif)#ip add 20.1.1.1 255.255.255.0 R1(config-subif)#exi R1(config)#exi R1# *Mar 1 00:06:04.751: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not full duplex), with SW1 FastEthernet1/5 (full duplex). R1#conf t R1(config)#int f0/0 R1(config-if)#duple R1(config-if)#duplex full R1(config-if)#speed 100 R1(config-if)#

ccna实验，路由部分，都是自己敲的，特意拿出来给大家分享一下，多多光顾。Router>en Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#ho r1 r1(config)#line con 0 r1(config-line)#logg sy r1(config-line)#exec-t 00 r1(config-line)#exi r1(config)#int s1/2 r1(config-if)#ip add 12.1.1.1 255.255.255.0 r1(config-if)#no sh *Mar 1 00:01:56.311: %LINK-3-UPDOWN: Interface Serial1/2, changed state to up *Mar 1 00:01:57.315: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to up r1(config-if)#exi r1(config)#router rip r1(config-router)#version 2 r1(config-router)#net 12.1.1.0 r1(config-router)#no auto-summary

在人才过剩的今天，企业对于有用人才的需求逐步加大，企业内部的人事变动和部门规划也开始加速，传统的人事档案已经不能满足各个企业的人员流动速度，迫使人们起用新的管理方法来管理员工的相关信息。科学技术日新月异的进步，让人类生活发生了巨大的变化，计算机技术的飞速发展，使各行各业在计算机技术应用方面得到了广泛的普及和使用。

数值分析课程中的欧拉公式，是在实验课上用c语言编的，水平有限，请各位老师多指教。

数值分析最小二乘法 本人是用C语言 在实验课上编的，时间有限，还有不足，请多指教！

计算机组成原理第四版答案，里面有很很详细的答案解析，用adble reader打开的。