CCNA认证考试 (collected from Braindumps)(1)
添加时间: 2007-9-7 8:08:40 作者: Cisco认证考试 阅读次数:41 来源: http://www.d9soft.com
The five steps of Encapsulation:
1) User information is converted to data.
2) Data is converted to segments.
3) Segments are converted to packets or datagrams.
4) Packets or datagrams are converted to frames.
5) Frames are converted to bits.
What kind of services are provided by the Presentation layer ?
JPEG, TIFF, PICT, EBCDIC to ASCII, MIDI, MPEG, QuickTime
What kind of services are provided by the Session layer ?
NFS, SQL, RPC, X Windows, ASP, DNA SCP
How to enable a Banner on a Cisco Router ?
Router(Config#) banner motd #
What are the three ways to display IPX interface e0 ?
sh ipx int e0
sh ipx interface e0
sh ipx interface ethernet0
What are the three ways to modify your running-configuration file ?
???
What s the default subnet mask for Class A, B and C IP adresses ?
Class A 255.0.0.0
Class B 255.255.0.0
Class C 255.255.255.0
Which IP-class provides the least number of Hosts?
Class C
How to define access-list commands ?
wrong: Router(config-if)# access-list 1 permit 172.16.20.1 0.0.0.0
right: Router(config) # access-list 1 permit 172.16.20.1 0.0.0.0
The access list will be defined at global level, not at the interface level. It’s a small but important detail. The access group command will be defined at interface level:
Router(config) # int e0
Router(config-if) # access-group 1 out
What are the access-list ranges of IP (standard and extended) ?
1-99 IP standard access list
100-199 IP extended access list
know also:
600-699 Appletalk access list
800-899 IPX standard access list
900-999 IPX extended access list
1000-1099 IPX SAP access list
What happens to a packet which receives the end of an access list ?
There is an implicit deny any at the end of an access list. So if the packet is not allowed, it will be dropped.
Which command is used to view the access-list on serial0 interface ?
show access-lists s0
How many access-lists are possible on an interface per protocol ?
There can be only one access list for in and one for out on each interface per protocol.
What is the FrameRelay configuration command for the second subinterface ?
interface s0.2 point-to-point
interface s0.2 multipoint
point-to-point is a direct link between two routers. multipoint is a router in the center as a star of virtual circuits.
How to change the Enable Secret password to CCNA ?
Router(config)# enable secret CCNA
How to change the Enable password to CCNP ?
Router(config)# enable password CCNP
How to change the Virtual Terminal password to CCIE ?
Router(config)# line vty 0 4
Router(config-line)# login
Router(config-line)# password CCIE
How to change the Auxiliary password to Cisco ?
Router(config)# line aux 0
Router(config-line)# login
Router(config-line)# password Cisco
How to change the Console password to Cisco ?
Router(config)# line con 0
Router(config-line)# login
Router(config-line)# password Cisco
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.
What is the command to show both source and destination addresses in ipx ?
debug ipx routing activity (not sure)
How are the ISDN protocols defined ?
I stands for concepts, terminology and services
E stands for existing telephone network
Q stands for switching and signaling
What are the correct encapsulation type of frame-relay ?
Cisco (default)
IETF
How to monitor Frame-relay activity on a Cisco router ?
show interface s0
show frame-relay map
Test Stats:
Questions: 70
Pass Score: 68%
Simulations: None (That I had)
Adaptive: No
Time: 90 Minutes
My results:
Attempt one: 64%
Attempt two: 72%
Summary:
Anyone with a decent familiarity of networks (OSI Model) and has worked on a Cisco router should get this test as a freebee almost.
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What three occurance reset the holddown timer after a trigger update?
What command copies a backup of the IOS image? copy running-config tftp albert
Session layer standards? What are some? (ASCII, NFS, SQL, MIDI, JPEG, etc...)
How do you change the admin password on the console? line con o
What is the host config file type?
How do you load the sys image "beta" from a tftp server?
2c.000.0c56.de34 <-- What protocol, Node, Network id, etc?
What are the characteristics of ISDN? (two identical questions with different answer choices)
How do you set the frame relay interface s1 bandwidth to 56k?
Transport layer functionality?
router#cl (Get ambiguous command) (how do you get the choices from here?)
How do you move the cursor to the beginning of the line? CTRL + A
Session Layer functionality?
Presentation Layer Functionality?
How do you display an ip address assigned to specific host names?
How do you turn on the motd on the router? banner motd #
What is the wildcard mask (subnet mask) for this situation?
how to dispplay the ipx address on ethernet 0?
What protocol is used to convert IP addresses to MAC addresses? ARP
What is flow control? Technique for ensuring that a transmitting entity, such as a modem, does not overwhelm a receiving entity with data. When the buffers on receiving device are full, a message is sent to the sending device to suspend the transmission until the data in the buffers has been processed.
Assuming a default subnet mask, what is the host, network, and class of the following ip address?
Presentation Layer standards? (MPEG, MIDI, SQL, NFS, etc...)
Traffic from should only go through ... how to implement?
Given an ip address and an subnet mask, what is the class, how many bits are being subnetted, and what is the broadcast address? (153.50.6.27 - 255.255.255.128)
How do you display the ipx routing updates in or out between routers? (I didn t really understand this question)
What password types control access to a router? (pw to access line, password to access EXEC mode, etc...)
What are the default encapslation and LMI type options?
What is the ICMP protocol for? Management protocol and messaging service provider for IP. Network Layer internet protocol that reports errors and provides other information revant to IP packets processing.
ISDN protocol standards? (Key in on the categories based on what letter the protocol starts with -- Q, I, E, etc...)
What two commands can be used to verify the address config.
Match the IPX encapsulation with the IOS encapsulation (i.e. Ethernet_II -> arpa, Ethernet_802.3 -> SAP, etc...)
How do you get help with a command syntax? lave a space ? type the question mark
Reliable transport layer connections support? (acknowledgments, route selection, checkpoints, etc...?) End-to-end communication
Responsible for hiding the communications from the higher layers. TCP / UDP
How are routing lops prevented?
How do you enable IPX on a router? ipx routing
Which technology is appropriate for serial communications? (CPE, Demarc, DTE, CO, etc...)
What are the technology implications of 1/2 duplex Ethernet cards?
How do you log onto EXEC mode? page 154 You have to log in to the router before an Exec command can be enterd
How do you enter commands on a router? (terminal, a file on a tftp server, etc?)
What is a MAC? Error Dectection. Responsible for framing and media access
How do we deny telnet traffic from on S0?
What does a manual shutdown look like when you run "show s1 status"?
With an ip address and access list, how do you display what interface a list has set?
What specifies a second sub-interface on S0?
How do you define an interface on a Cisco 7000 or 7500 with a VIP card installed?
What are the components of the route command?
Which class allows for the fewest hosts?
What does the MAC layer of the Datalink layer do?
Something about serial communications with a permanent virtual circuit with layer 2 id s (Can t read my handwriting on this one, sorry!)
The bottom line? Know the OSI model *very* well, and know the basic commands on a Cisco router and you should do fine!
Good luck!!!
p.s. Test #1 and Test #2 were eerily similar... there must not be a huge pool of questions... ;)
Odds and Ends I have found so far....
>The CCNA test is 70 questions, 68% to pass.
>Concentrate on the OSI layers and
>TCPIP addressing.
>Forget about AppleTalk.
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A couple of topics seem to be reapering in the test
1) OSI layers and where the protocols fit in.
2)tcp/ip and ipx/spx
3)configuration commands and there syntaxes
4)Access lists and there syntaxes.
5)isdn, x.25,
Any demo tests you do you would be looking to score 95-100% on and even then it s ?. I m not looking to scare you but it wasn t easy, and if you have the cisco icrc router config study guide it helps. goodluck.
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: OSI layers.
: read the ICRC material (either take the
: course or read the ICRC book.
: Subnets
: - no AppleTalk -
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What is actually on the test?
According to Cisco you need to be able to configure and manage "simple" networks. What defines "simple" networks (according to Cisco): IP, IGRP, IPX, Serial, AppleTalk, Frame Relay, IP RIP, VLANs, IPX RIP, Ethernet, Access Lists In addition to the recommended study topics you should be very fluent with several other (not all listed) topics. A few examples of these would be: The OSI model, and Cisco Discovery Protocol. A lot of the questions deal specifically with the Cisco IOS, such as installing, logging in, navigating, backing up, and debugging.
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I am compiling a list of URLs that are of use to those seeking Cisco accreditation in the routing and switching field. The list has thirty entries so far and can be found in the Networking Resources section of my home page at:
http://wwww.lovegrove.co.uk/bgl/
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: There is an extensive demo exam for CCNA on the syngress web site. About 215 questions. I was wondering if anyone could tell me how close these questions compare w/ the actual test. I am at about Chapter 7 in the Study Guide and am open to any study groups that anyone is trying to organize.
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http://www.cciePrep/ccnaPrep.com web
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Go to these free sites, excellent resource for VARS and resellers of Cisco products.
http://www.cisco-resellers.com
http://www.cisco-vars.com
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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?
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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.:)
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http://www.cciebootcamp.com/
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.
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