collectedfromBraindumps(4)
添加时间: 2007-9-3 22:25:39 作者: Cisco认证考试 阅读次数:40 来源: http://www.d9soft.com
http://www.cciePrep/ccnaPrep.com web
Go to these free sites, excellent resource for VARS and resellers of Cisco products.
http://www.cisco-resellers.com
I have taken the ccna test a couple of times and there seems to be a couple of questions that showed up each time that I am curious about.
1. What is the command to show you both source and destination dlci s in one command. I m thinking it is show frame-relay route but I m not sure.
2. What is the command to show both source and destination addresses in ipx. I m thinking it is "debug ipx activity".
3. What is half duplex? I know it is you can tx & rx in both directions but only one at a time, but the way they word it is confusing. They say it is transmit connected to receive circuit or vice-versa or they say it is like a one way bridge. The closest answer I could find in the multiple choice it the one way bridge?
Took the test for the first time and the syngress book covers about 60 to 70% of the test. There are ? s on banners and the IOS commands to set it up. Know OSI and what each layer does. Know IP and IPX configuration commands. Know Access List, the IOS commands to set them up, and how to interpret access list. Understand how to use TFTP, flash, etc. to config router image. I got a 44% ,but this is my lucky month so look for more post.:)
Subject: CCNA Exam
I took my CCNA exam last night. It was pretty straight Forward. I got 88%. I would recommend to study Todd Lammle s book thoroughly.
Brain Dump:
Concentrate on OSI and DOD modely thoroughly
Complex subnetting (if you course the 8 bit boundry for Class A and Class B)
IPX monitoring Commands. Questions could be:
>What are the three ways you could display ipx E0 interfaces: commands are: SHOW IPX INTERFACE ETHERNET 0, SHOW IPX INTERFACE E 0,& SHOW >IPX INT E0.
For WAN. Concentrate on ISDN, reference points and protocols. One question about FrameRelay configuration command for subinterface: INTERFACE 0.1 POINT-TO-POINT.
Know your Cisco Commands, three ways to modify configuration files, banner commands, password commands.
Know how to define and enable access-list.
They would try to confuse you by defining configuration commands on interface mode which is wrong. You configure your access-list in configuration mode and enable access-list on interface commands.
KEY POINTS TO BECOME CCNA
1) Know your OSI Model throughly. Just read Todd Lammle s OSI model line by line. For example, You would be thrown a question: Five steps of Encapsulation
1) Packets are put into logical frame.
2) User information is converted into data
3) Data is converted into segments
4) Segments are converted into datagrams and packets
5) Frames are put into bits
* 3 2 1 3 4
* 1 2 3 4 5
* 4 5 3 2 1
* 2 3 4 1 5 Answer
What kind of services are provided by presentation layer: JPGEG, MPEG, MIDI, TIFF so on What kind of services are provided by Session layer: NFS, RPC, SQL and so on.
2) Constrate on your DOD model. What is TCP, UDP and how they perform their functions.
3) Know your Cisco Commands. For example, how to enable Banners. You will see a A section of Banner s in Todd s book.
Router(Config#) banner motd #. You will be confused by saying that you must use this command in order to logon to the router which is wrong.
Choose the answer which hit enter and you will see a banner.
What are the three ways to modify your running-configuration file.
What are the three ways to display IPX interface e0. They are: sh ipx interface e 0, sh ipx int e0, and sh ipx interface ethernet 0.
4) Define access-list commands. You will be confused by seeing that
* Router(config-if) access-list 1 permit 172.16.20.1 0.0.0.0
You see a catch here. You define this command at Global level, not interface level.
You would define ip access-group 110 in at interface level. Keep this in mind where to define which command.
How to define a range of access list: For example, 172.16.10.0 - 172.16.40.0. what is the wild mask you will use.
Study Complex subnetting throughly. Meaning if you cross 8-bit boundry. For example: take an ip address 172.16.0.0. It is a Class-B network. You use 11-bit for subnetting. You will be asked to choose the correct range of host addresses. Todd has shown the chart which will help you a lot.
What s the default subnet mask for Class A, B and C.
On WAN: study ISDN and Frame Relay. Constrate more on ISDN. I only saw one question about Frame Relay which is (router-sub-if)# interface 0.1 point-to-point. Catch is you must define point-to-point or multipoint in order to complete the command.
ISDN: I had 4 questions. Study Reference points and Protocols.
For example E.I.Q.
E defines and existing line. I defines concept and terminology and Q defines switching. Question would be mixed. Just align them. Other questions are
ISDN provides Data only, Wrong
ISDN provides Voice only, Wrong
ISDN provides Both data and voice Correct
ISDN provides more bandwidth than fraction 56k T-1 Line. Correct
CDP: I am not sure about the command, but by default CPD update time is 60. How to change it to 90.
Test Name:CCNA
Test #640-407
Very well put. I am attaching my "prep sheet" for the exam - basically the requirement sheet from Cisco s website with most of the answers. It helped me to pass the CCNA with flying colors ...:
1) OSI Reference Model
7.) Applications: Where the user applications software lies. Such issues as file access and transfer, virtual terminal emulation, interprocess communication and the like are handled here.
6.) Presentation: Differences in data representation are dealt with at this level. For example, UNIX-style line endings (CR only) might be converted to MS-DOS style (CRLF), or EBCIDIC to ASCII character sets.
5.) Session: Communications between applications across a network is controlled at the session layer. Testing for out-of-sequence packets and handling two-way communication are handled here.
4.) Transport: Makes sure the lower three layers are doing their job correctly, and provides a transparent, logical data stream between the end user and the network service s/he is using. This is the lower layer that provides local user services.
3.) Network: This layer makes certain that a packet sent from one device to another actually gets there in a reasonable period of time. Routing and flow control are performed here. This is the lowest layer of the OSI model that can remain ignorant of the physical network.
2.) Data Link: This layer deals with getting data packets on and off the wire, error detection and correction and retransmission. This layer is generally broken into two sub-layers: The LLC (Logical Link Control) on the upper half, which does the error checking, and the MAC (Medium Access Control) on the lower half, which deals with getting the data on and off the wire.
1.) Physical: The nuts and bolts layer. Here is where the cable, connector and signaling specifications are defined.
2) Connection-oriented vs. connectionless service
Connection-oriented: Similar to HDLC
Connection establishment and termination required
Sequenced, acknowledged data delivery
Built-in error recovery
Sliding window flow control
Connectionless: Data transfer without virtual circuit
No message sequencing
No delivery guarantee
Higher layer is responsible for error recovery, flow control, and reliability
3) Data-Link vs. network addresses Link Layer: MAC address (see below
4) Network Layer: Virtual/logical address, unique within a hierarchical address space, contains a network and a host part
4) What is a MAC address Link layer address to uniquely identify a device/port in a LAN segment, is 48 bits (= 6 bytes) long, first 3 bytes identify a vendor code
5) Flow control and 3 basic methods
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