My home

    对于英语比较好的同学我推荐Sybex CCNA 4.0+TK43+TK修正（TK40修正，准确率99%以上，而原来的TK错的题目不下20道）+boson netsim5.31就够了！
    对于英语不好的同学，我推荐人民邮电出版的CCNA的学习指南+TK43+TK修正+boson netsim5.31。
    以上资料是考试比选，以下资料是可选。
    思科网络学院3-4期CCNA教材，很经典，讲的也很透彻！
    bonson5.35 router test,很经典的练习题，尤其是拖图题和实验题和真实考试难度类型都一模一 样，如果想知道考试题目的类型或者是想多学一点东西可以选择它，注意，如果学的比较好的话直接从第三套题目开始做，第一和第二就不用做了！
            
    以上资料全部可以在baidu.com搜索的到，你要学会用搜索引擎！

2：关于培训：你要注意以下几点：
    1）如果以前有网络基础英语也可以的同学可以直接培训，否则培训前必须把课本多看几遍，不然一般培训是6天或者是12天的，你会不知老师在讲什么。
    2）培训前必须先试听一下，如果觉得老师水平不行或者是读课本，就不用去培训了，自己在家里搞个路由器模拟器netsim5.31就可以了！
    3）培训的时候不懂就问呀，我可是快把我们的NP老师问傻了呢。我们老师虽然只是一个NP,但是呢他有10年网络经验，而且给我们将课本从来不带课本都是用真设备给我们演示的呢。我学会了SolarWinds_2002这个超级网管软件和用Sniffer分析数据包还有网络测试仪的使用和故障判断！
    4）多做实验，多把命令敲几变，不要胆小呀，就算你不小心把路由器的IOS给删除了，老师也有办法给恢复呢！

    以上全部靠你的感觉来选择培训学校的，要注意不要舍不得花钱了，当然基础好的话不用培训也可以过！

3：关于复习：

     1）多读书，我Sybex CCNA 4.0 精读两遍，人民邮电出版的CCNA的学习指南6遍。
     2）书读好后可以看TK了，我用的是TK41,记住一定要做，而不是看，更不是背答案，TK最少要搞2遍以上，然后带着TK上的疑问再读书，再看TK,再读书，相信你也会考1000分的！我可是做了8遍的呢！

4：关于考试：

    考试一共是55道题目，根据考点的不同考试时间不是90分钟就是120分钟！
    考试一共分选择题（单选，多选），拖图题，实验题（一般两个）。

5：关于注册

    我想考试最难的实验，我就把考试常见实验给大家分析一下吧！

    1）RIP,必考的题目，配置方法是conf t
                             router rip
                             (如果是要配置RIP Version 2的话还要加上version 2)
                             network 192.168.10.0
                             network 192.168.20.0
                             end
                             copy run start
                             就是直接相连的网段一定要配置上！
    2）ospf,             配置方法是conf t
                             router ospf 1(1-65535)
                             network 192.168.10.0 0.0.0.255 area 0
                             network 192.168.20.0 0.0.0.255 area 0
                             end
                             copy run start
                  
    3）VTP(VLAN),  配置方法是conf t
                             int vlan 1
                             ip address 192.168.10.1 255.255.255.0
                             no shut
                             ip default-gateway 192.168.20.1
                             vtp mode client
                             vtp domain CCNA
                             exit
                             copy run start

    注意考试的时候用vlan database进入配置模式也和conf t进入是一样的，都可以拿满分的请大家放心。

    4）ACL, 现在是很少考到了，不过提一下，实际工作中很有用处的！

    注意，考试的时候很有可能是让你排除错误再来配置路由器和交换机的，以下是一些很有用处的命令！
    1：no shut,如果你看到一个端口不是up,up的话就要no shut以下，还有如果你更改完一个端口的IP以后也要no  shut一下！
    2：ping 很有用处的命令，比如你做完实验想看看你做的对不对就要ping,记住比如3个路由器想连的话，所有的s0,s0,e0,e1都要ping通才行！
    3：show run,这是最重要的命令，记住3个路由器都要show run呀，比如如果那个端口被shut down了，或者是配置rip时少配置网段了，配置ospf area 配置错误，包括查看VTP domain,VTP mode都全考它了！
    4：no命令，比如如果路由AS,或者是Process ID有错误，你可以conft ,no router rip,或者是no ospf 1(Process ID)，用show ip ospf得到Process ID
    比如如果网段或者是area有错误你可以 conf t,router rip(ospf),no network 19 ...(area ID),可以用show run查看
    如果是题目少配置了网段，你conf t,router ospf 1,network 192.168.30.0 0.0.0.255 area 0
    就可以，就不用no了！也可以用show run查看！
    5：show ip route,查看你配置的路由是否在路由表中，注意看看是不是有少的网段，以及管理距离是否是你所配置路由协议的默认管理距离，注意直连路由管理距离0,静态1，EIGRP 90，IGRP 100,OSPF 110,RIP 120。
    6: show ip ospf,show ip ospf interface s0(e 0),如果你的进程配置有错误或者是想得到以前配置的ospf的进程需要这个命令。
    7：show ip interface,你可以查看是否你配置的ACL应用到了你的接口上。
    8：show acccess-lists,你可以查看你所配置的ACL语句是否正确！
    9：show access-list 1(数字），你所配置的具体ACL语句！
    10:show vtp status,你可以在交换机上查到你的vtp domain,vtp mode等等
    11：show vlan ,show vlan brief,show vlan 1，查看具体的vlan 配置！

     一些TK争议题目，我给大家确定一下：
    1：ISDN的D信道不能被hdlc,ppp封装！
    2：Where are EIGRP successor routes stored?
    In the routing table only.
    希望我写这些对初学CCNA的同志们能有一点帮助，我就心满意足了！
    最下边是我对TK43新增的26个题目的修订!全部根据满分战报修订的答案！欢迎交流！

QUESTION N 347
In the router IOS binary image file name c7200-ajs40-mx, what does c7200 represent?
A. The memory capacity requirements
B. The hardware product platform
C. The distribution channel
D. The feature capabilities
E. The run location and compression status
Answer: B
Explanation:
Cisco has a Cisco IOS image naming convention for identifying the platform or board for which the binarysoftware is built, the package feature content of the image, and the area of memory used by the image at run time. The image name follows a three-part format: PPPPP-FFFF-MM
where PPPPP represents the platform; FFFF represents features; and MM represents run-time memory and compression format.

QUESTION N 348
You are a technician at TestKing. You are troubleshooting a connectivity problem on the TestKing
network. You want to isolate the problem. You suspect that a router on the route to an unreachable network is at fault.
What IOS user EXEC command should you issue?
A. Router> ping
B. Router> trace
C. Router> show ip route
D. Router> show interface
E. Router> show cdp neighbors
Answer: D
Explanation:
Show interface - Lists interface statistics, including IP addresses.

QUESTION N 349
You are the network administrator at TestKing.com. You want to telnet to a router on the TestKing
network, however, the connection is denied. You verify connectivity to the router by pinging the router successfully. You need to enter a set of commands on the remote router to allow Telnet connectivity.
Which commands should you use?
A. router(config)# line con 0
router(config-line)# password welcome
router(config-line)# login
B. router(config)# line aux 0 4
router(config-line)# password welcome
router(config-line)# login
C. router(config)# line vty 0 4
router(config-line)# password welcome
router(config-line)# login
D. router(config)# line tty 0 4
router(config-line)# password welcome
router(config-line)# enable login
Answer: C
Explanation:
Several concurrent Telnet connections to a router are allowed. The line vty 0 4 command signifies that this configuration applies to vtys (virtual teletypes/terminals) 0 through 4.
Reference: CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 178

QUESTION N 350
You are the network administrator at TestKing. Your assistant made a number of errors when utilizing the router setup mode facility. You want to exit setup mode without applying the changes that your assistant made.
What should you do? (Select two.)
A. Type exit at the setup dialog.
B. Type close at the setup dialog.
C. Press the Ctrl-C key combination.
D. Press the Ctrl-X key combination.
E. Issue the copy startup-config command.
F. Issue the write erase command.
Answer: A, C

QUESTION N 351
The graphic shows the result of an attempt to open Telnet connection to router ACCESS1 from router Remote27.
Which of the following command sequences will correct this problem?
A. ACCESS1(config)# line console 0
ACCESS1(config-line)# password cisco
B. Remote27(config)# line console 0
Remote27(config-line)# login
Remote27(config-line)# password cisco
C. ACCESS1(config)# line vty 0 4
ACCESS1(config-line)# login
ACCESS2(config-line)# password cisco
D. Remote27(config)# line vty 0 4
Remote27(config-line)# login
Remote27(config-line)# password cisco
E. ACCESS1(config)# enable password cisco
F. Remote27(config)# enable password cisco
Answer: C

QUESTION N 352
The internetwork infrastructure of TestKing consists of a single OSPF area as shown in the graphic- There is a concern that a lack of router resources is impeding internetwork performance. As part if examining the router resources, the OSPF DRs need to be known. All the router OSPF priorities are the default and the router IDs are shown with ach router.
Which routers are likely to have been elected as DR? (Choose two)
A. Corp-TK1
B. Corp-TK2
C. Corp-TK3
D. Corp-TK4
E. Testking-1
F. Testking-2
Answer: E, F

QUESTION N 353
Refer to the topology and configuration shown in the graphic.
Which IOS commands are required to configure switch port 1 to establish a link with router Testking1 as shown? (Choose three)
A. Switch(config)# interface fastethernet 0/1
B. Switch(config-if)# switchport mode access
C. Switch(config-if)# switchport mode trunk
D. Switch(config-if)# switchport access vlan 1
E. Switch(config-if)# switchport trunk encapsulation isl
F. Switch(config-if)# switchport trunk encapsulation dot1q
Answer: A, C, F

QUESTION N 354
With which network type will OSPF establish router adjacencies but not perform the DR/BDR election
process?
A. Point-to-point
B. Backbone area 0
C. Broadcast multicast
D. Nonbroadcast multicast
Answer: A

QUESTION N 355
An internetwork has been configured as shown in the diagram, with both routers using EIGRP routing for AS 44. Users on the Branch router are unable to reach any of the subnets on the HQ router.
Which of the following commands is necessary to fix this problem?
A. Branch(config-router)# version 2
B. Branch(config-router)# no auto-summary
C. Branch(config-router)# redistribute eigrp 44
D. Branch(config-router)# eigrp log-neighbor-changes
E. Branch(config-router)# default-information originate
Answer:B

QUESTION N 356
Drag the access list statement on the left to the IP address on the right that will match it. Not all optionsare used.
Answer:

QUESTION N 357
A switch has been configured for three different VLANs: VLAN 2, VLAN 3, and VLAN 4. A router is to be added to provide communication between the VLANs.
What type of interface is necessary on the router if only one connection is to be made between the router and the switch?
A. 10 Mbps Ethernet
B. 56 kbps serial
C. 100 Mbps Ethernet
D. 1,544 Mbps serial
E. 1 Gbps Ethernet
Answer:C

QUESTION N 358
A network administrator wants to ensure that only the server can connect to port Fa0/1 on a Catalyst switch. The server is plugged into the switch Fa0/1 port and the network administrator is about to bring the server online.
What can the administrator do to ensure that only the MAC address of the server is allowed by switch port Fa0/1? (Choose two)
A. Configure port Fa0/1 to accept connections only from the static IP address of the server.
B. Employ a proprietary connector type on Fa0/1 that is incompatible with other host connectors.
C. Configure the MAC address of the server as a static entry associated with port Fa0/1.
D. Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofing the server IP address.
E. Configure port security on Fa0/1 to reject traffic with a source MAC address other than that of the server.
F. Configure an access list on the switch to deny server traffic from entering any port other than Fa0/1.
Answer:A,C

QUESTION N 359
Host A in the graphic is connected to a switch post assigned to VLAN 1.
Which two settings on host A are required to allow connectivity with host B on VLAN2? (Choose two)
A. IP address: 192.1.1.66 255.255.255.240
B. IP address: 192.1.1.130 255.255.255.192
C. IP address: 192.1.1.142 255.255.255.240
D. Default gateway: 192.1.1.129
E. Default gateway: 192.1.1.65
F. Default gateway: 192.1.1.1
Answer:

QUESTION N 360
It is necessary to allow only Telnet connection to a router.
Match the commands on the left that will accomplish this task with their function on the right. Not all options are used.

QUESTION N 361
What will occur if two Cisco LAN switches are connected with a single crossover cable?
A. The switch port link lights will be off on both switches indicating the ports are not connected.
B. The switch port link light will be off on one switch indicating that STP has disabled the port.
C. The switch port link lights will flash amber indicating an error.
D. The switch port link lights will be green indicating normal operation.
Answer:D

QUESTION N 362
Refer to the diagram. All hosts have connectivity with one another.
Which statements describe the addressing scheme that is in use in the network? (Choose three)
A. The subnet mask in use is 255.255.255.192.
B. The subnet mask in use is 255.255.255.128.
C. The IP address 172.16.1.25 can be assigned to hosts in VLAN1.
D. The IP address 172.16.1.205 can be assigned to hosts in VLAN1.
E. The LAN interface of the router is configured with one IP address.
F. The LAN interface of the router is configured with multiple IP addresses.
Answer: B, C, F

QUESTION N 363
Refer to the diagram.
Which three statements describe the router port configuration and the switch port configuration as shown in the topology? (Choose three)
A. The Testking1 WAN port is configured as a trunking port.
B. The Testking1 port connected to Switch1 is configured using subinterfaces.
C. The Testking1 port connected to Switch1 is configured as 10 Mbps.
D. The Switch1 port connected to Testking1 is configured as a trunking port.
E. The Switch1 port connected to Host B is configured as an access port.
F. The switch1 port connected to Hub1 is configured as full duplex.
Answer:

QUESTION N 364
Where are EIGRP successor routes stored?
A. In the routing table only.
B. In the neighbor table only.
C. In the topology table only.
D. In the routing table and neighbor table.
E. In the routing table and topology table.
F. In the topology table and neighbor table.
Answer: A

QUESTION N 365
Which protocol reduces administrative overhead in a switched network by allowing the configuration of a new VLAN to be distributed to all the switched in a domain?
A. STP
B. VTP
C. GVRP
D. SNMP
E. DHCP
Answer: B

QUESTION N 366
What is the maximum data rate specified for IEEE 802.11b WLANS?
A. 10 Mbps
B. 11 Mbps
C. 54 Mbps
D. 100 Mbps
Answer: B

QUESTION N 367
Refer to the network shown in the graphic.
Which access list statement will prevent hosts in the range of networks from 192.168.160.0 to
192.168.191.0 from access to the server and not affect access by hosts from the 192.168.195.0 network?
(The access list will be placed on the Home router Fa0 interface.
A. access-list 1 deny 192.168.163.0 0.0.0.255
B. access-list 1 deny 192.168.128.0 0.0.127.255
C. access-list 1 deny 192.168.0 0.0.31.255
D. access-list 1 deny 192.168.155.0 0.0.255.255
Answer: C

QUESTION N 368
TestkingA# show running-config
<some output text omitted>
router rip
network 10.0.0.0
!
ip classless
TestkingA# show ip route
<some output text omitted>
Gateway of last resort is 10.1.2.2 to network 0.0.0.0
10.0.0.0/24 is subnetted, 2 subnets
R 10.1.3.0 [120/1] via 10.1.2.2, 00:00:00, Serial0/0
C 10.1.2.0 is directly connected, Serial0/0
C 10.1.5.0 is directly connected, Serial0/1
C 10.1.6.0 is directly connected, FastEthernet0/0
R* 0.0.0.0/0 [120/1] via 10.1.5.5, 00:00:00, Serial0/1
Refer to the output of the two show commands in the graphic. If an administrator tries to ping host 10.1.8.5 from host 10.1.6.100, how will the ICP packets be processed by TestkingA?
A. The packets will be discarded.
B. The packets will be routed out the S0/0 interface.
C. The packets will be routed out the S0/1 interface.
D. The packets will be routed out the Fa0/0 interface.
E. The packets will be routed through the 10.1.2.2 gateway.
Answer:A

QUESTION N 369
Which of the following are layers in the TCP/IP model? (Choose three)
A. application layer
B. session layer
C. transport layer
D. internet layer
E. data link layer
F. physical layer
Answer: A, C, D

QUESTION N 370
A new internetwork is being implemented with a single Class C network address.
Which configuration command must be in effect to allow the use of eight subnets if the subnet mask is 255.255.255.224?
A. Router(config)# ip classless
B. Router(config)# ip version 6
C. Router(config)# no ip classful
D. Router(config)# ip unnumbered
E. Router(config)# ip subnet-zero
F. Router(config)# ip all-nets
Answer: E

QUESTION N 371
Which statements are true about EIGRP successor routes? (Choose two)
A. A successor route is used by EIGRP to forward traffic to destination.
B. Successor routes are saved in the topology table to be used if the primary route fails.
C. Successor routes are flagged as "active" in the routing table.
D. A successor route may be backed up by a feasible successor route.
E. Successor routes are stored in the neighbor table following the discovery process.
Answer:A,C

QUESTION N 372
TestKing is redesigning the network that connects its three locations. The administrator gave the
networking team 192.168.55.0 to use for addressing the entire network. After subnetting the address, the team is ready to assign the address. The administrator plans to configure ip subnet-zero and use RIP v2 as the routing protocol. As a member of the networking team, you must address the network and at the same time converse unused addresses for future growth. With those goals in mind, drag the host addresses on the left to the correct router interface. One of the routers is partially configured. Non all ofthe host address on the left are necessary.
Answer:

QUESTION N 373
The routers Testking1 and Testking2 are both configured with RIP only.
What will be the result when Testking1 receives a routing update that contains a higher cost path to a network already in its routing table?
A. The update will be ignored and no further action will occur.
B. The update information will be added to the existing routing table.
C. The update information will replace the existing routing table entry.
D. The existing routing table entry will be deleted from the routing table and all routers will exchange routing updates to reach convergence.
Answer: A

另外tk有很多错题，我以tk45版本作基础，再把以前所有tk21的争议题的正确答案都改过来，之后再按改过后的版本来温习，就考了九百多分.

　　CCNA 640-801（变化程度：30%）

　　1、去掉IPX配置及OSI参考模型，Novell网的内容已经完全从思科的考试中绝迹了。CCIE、CCNP都已放弃IPX/SPX内容，现在CCNA考试也完全放弃，IPX/SPX的应用范围会越来越窄。

　　2、广域网仍然不是CCNA的重点。640-810和老版本一样，还是包含帧中继、点对点连接和ISDN，在ISDN中引入了PRI。

　　3、协议中增加EIGRP、OSPF协议，但也基本上是概念，没有考到实际配置。重点依然是RIP协议。

　　4、增加NAT和PAT，教材内容更加实用化。

　　CCNP 642-801 BSCI：（变化程度：20%）

　　1、增加IPv6 的概念。

　　2、新增RIP v2。该考点以前为CCIE认证的知识范畴，现在调整到BSCI课程，RIP v1的内容在ICND2.0已经涉及到。

　　3、增加NAT的概念和配置，NAT转换采用更高级的Route－map控制，增加ODR协议，去掉IGRP协议，EIGRP协议中增加STUB区域，ISIS协议中去掉抽象理论，增加实用配置，BGP中去掉Router Reflector , 增加12.2 IOS版本新技术。

　　4、OSPF保留多区域配置，删除单区域配置，单区域考点在ICND2.0开始考查了。

　　5、路由性能及优化部分增加了MPLS知识。

　　　CCNP 642-811 BCMSN：（变化程度：70%）

　　1、IOS采用Native IOS版本，淡化CAT OS。Cat OS和Native IOS的比较和介绍：Cat OS为基于SET命令集，Native IOS 为命令集等同于路由器。（据12.25日考过的网友说，Cat的知识一点没涉及到）

　　2、交换机标准设备变动较大，更换成：访问层的2950交换机，分布层的3550交换机，核心层的4006以及6500交换机。

　　3、在VLAN中引入802.1Q Trunking(Q in Q)

　　4、对于多播部分加入了IGMPv3,还加入了Cisco IP Telephony技术。

　　5、增加STP的内容：包括RSTP和MSTP。

　　6、采用 HSRP, VRRP, GLBP, SRM, SLB 做 router redundancy

　　7、在三层交换机中更加细致的讲述了CEF—Based MLS，增加CISCO私有的多层交换技术：CEF(思科快速转发)。

　　8、Cisco引入AVVID架构概念。

　　9、Multilayer Switched Networks 的安全性及优化

　　10、增加园区网Qos设计与实现，QoS是BCMSN的重点

　　11、增加组播部分内容

　　　12、对于网络分析功能，介绍SPAN，VSPAN，RSPAN和硬件NAM的配置。

　　CCNP 642-821 BCRAN：（变化程度：40%）

　　1、取消CISCO700，X.25、Windows 95拨号连接，删掉WIN 95/NT拨号配置

　　2、增加Cable Modem内容

　　3、增加了DSL技术包括：ADSL，VDSL,SDSL，S.SHDSL，IDSL等DSL技术

　　4、增加PPPoE， PPPoA协议

　　5、增加了VPN内容，包括IPSec和加密技术

　　CCNP 642-831 CIT：（变化程度：50%）

　　1、增加OSPF以及EIGRP的排错

　　2、取消AppleTalk和IPX的排错内容

　　3、增加Qos以及组播的排错、增加VPN排错

　　4、CIT的新版课程变化很大，除了介绍一些排错理念、排除方法论和排错工具外，还有针对其他三门课程内容的排错,如 OSPF, NAT, QoS, ADSL, VPN等。也从以前重点讲述技术转变为重点讲述技术文档的建立、完善和Troubleshooting流程及日志。