本人以前通过CCNA，提供一些建议。
条件：
英语一定要好
对osi参考模型，tcp／ip模型有很好的掌握
使用过CISCO的低端路由器
对交换机的运作功能有一些基础
a.ccna certification exam objective
the ccna (640-407)exam will consist of a combination of the following objective
1.identify and describe the functions of each of the seven layers of the osi reference
model
2.describe connection-oriented network service and connectionless network service
,and identif the key differences between them.
3.describe data link addresses and network addresses,and identify the
key differences between them
4.define and describe the function of a mac address.
5.define flow control and describe the three basic metthods used in netwoeking
6.differentiate between the following wan services:frame relay,isdn/lapd,hdlc,&ppp
7.log into a router in both user and privileged modes
8.use the context-sensitive help facility
9.use the command history and editing features
10.examine router elements(ram,rom,cdp,show)
11.manage configuration files from the privileged exec mode
12.control router passwords,identification and banner
13.identify the main cisco ios commands for router startup
14.check an initial configuration using the setup command
15.copy and manipulate configuration files
16.list the commands to load cisco ios software from:flash memory,a tFtp server,or
rom
17.prepare to backup,upgrade,and load a backup cisco ios software image
18.list the key internetworking functions of the osi network layer and
how they are performed in a router
19.describe the two parts of network addressing,then identify the part
s in specific protocl address examples
20.list problems that each routing type encounters when dealing with topology
changes and describe techniques to reduce the number of theseproblems
21.explain the services of separate and integrated multiprotocol routing
22.describe the different classes of ip address
23.configure ip address
24.verify ip address
25.prepare the initial configuration of your router and enable ip
26.add the rip routing protocol to your configuration
27.add the igrp routing protocol to your configuration
28.list the required ipx address and encapsulation type
29.enable the novell ipx protocol and configure interfaces
30.monitor novell ipx operation on the router
31.recognize key frame relay terms and features
32.list commands to configure frame relay lmis,maps,and subinterfaces
33.list commands to monitor frame relay operation in the router
34.identify ppp operations to encapsulate wan data on cisco routers
35.configure standard access lists to figure ip traffic
36.monitor and verify selected access list operations on the router
37.state a relevant use and context for isdn networking
38.identify isdn protocols,function groups,reference points,and channels
39.describe cisco’s implementation of isdn bri
40.describe the advantages of lan segmentation
41.describe lan segmentation using bridges
42.describe lan segmentation using routers
43.describe lan segmentation using switches
44.name and describe two switching methods
45.describe full and half duplex ethernet operation
46.identify at least 3 reasons why the industry uses a layered model
47.identify the functions of each layer of the iso/osi refernce model
48.define and explain the 5 conversion steps of data encapsulation
49.identify the functions of the tcp/ip transport-layer protocols
50.identify the functions of the tcp/ip network-layer protocols
51.identify the functions performed by icmp
52.configure extended access lists to filter ip traffic
53.configure ipx access lists and sap filters to control basic novell traffic
54.monitor and verify selected access list operations on the router
55.describe network congestion problem in ethernet networks
56.describe the benefits of network segmentation with bridges
57.describe the benefits of network segmentation with routers
58.describe the benefits of network segmentation with switches
59.describe the features and benefits of fast ethernet
60.describe the guidelines and distance limitations of fast ethernet
61.distinguish between cut-through and store-and-forward lan switching
62.describe the operation of the spanning tree protocol and its benefits
63.describe the benefits of virtual lans
