CiscoCCNA考试56题(1)
添加时间: 2007-9-3 22:56:54 作者: Cisco认证考试 阅读次数:121 来源: http://www.d9soft.com
Hope this helps. It helped me study for the CCNA.
1. What are the valid Host ID’s for 222.37.2.50 /24 ? A.) 222.37.2.48 - 222.37.2.66 B.) 222.37.2.49 - 222.37.2.62 C.) 222.37.2.0 - 222.37.2.255 D.) 222.37.0.0 - 222.37.255.254 E.) 222.37.2.1 - 222.37.2.254
D
2. Which commands listed below will move you from interface configuration mode back to global configuration mode? A.) CTL+Z B.) CTL+F C.) exit D.) global E.) config t
C CTRL-Z and CTRL-C will abort you back to the root. Exit goes back one level.
3. You have a Unix server running the TFTP Daemon. What is the command to load a configuration file from the TFTP server into the routers RAM? A.) copy tftp ram B.) copy tftp running-config C.) read tftp D.) copy tftp startup-config E.) copy tftp nvram
B Remember RAM = RUNNING-CONFIG. All changes to RAM are immediate!
4. Given the following static route command, ip route 3.3.3.0 255.255.255.0 4.4.4.4 125, which portion represents the next hop TCP/IP address? A.) 125 B.) 3.3.3.0 C.) 255.255.255.0 D.) route E.) 4.4.4.4
E Router(config)#ip route 3.3.3.0 255.255.255.0 ? A.B.C.D Forwarding router’s address
5. In regards to the ISDN BRI standard, which channel is used for control? A.) E B.) Q C.) D D.) I E.) B
C B is Bearer for Data (2 channels at 64kb each). D is for Control (16kb).
6. Which Distance Vector characteristic can help to speed up convergence? A.) Inverse ARP. B.) Poison Reverse. C.) Triggered Updates. D.) Split Horizon. E.) Hold Down timers.
C Instead of waiting on a pre-set periodic interval (before sending the routing table), DV routing protocols can send triggered updates to immediately notify the neighbor routers. Hold down timers, Poison Reverse, and Split Horizon are features that are used to avoid routing loops.
7. What command would show the current configuration register settings? A.) show running-config B.) show startup-config C.) show nvram D.) show ram E.) show version F.) show ios
E For most routers the configuration register settings are: 0x2102 normal operation (parse NVRAM at startup), or 0x2142 password recovery (ignore NVRAM during startup).
8. What would the following command do?: ’Show Frame-Relay PVC’ A.) Display LMI Info. B.) The command is incomplete, and would be ignored. C.) Display all configured DLCI’s. D.) Debug a Frame-Relay Problem. E.) Show Virtual Links.
C The Permament Virtual Circuit (PVC) info is displayed along with the Data Link Connection Identifiers (DLCI)’s.
9. Which of the following are examples of the Session Layer? (3 answers) A.) SQL B.) NFS C.) IP D.) TCP E.) Netbios Names F.) Token Ring
A B E Controls mechanisms such as checkpoints, terminations, and restarts to establish, maintain, and synchronize communications between applications. Examples: SQL, RFC, RPC, X-Windows, NetBIOS Names Layer 5 of the OSI reference model.
10. When editing a line in the CLI mode, what does ’CTRL-P’ do? A.) Moves you to the next word. B.) Moves you to the next command. C.) Moves you to the end of the line. D.) Moves you to the beginning of the line. E.) Moves you to the previous command.
E
11. The Internet Control Message Protocol occurs at what layer of the seven layer model? A.) Physical B.) Session C.) Datalink D.) Network E.) Presentation F.) Transport
D ICMP is used for error handling and testing at layer 3. Ping and traceroute are examples of ICMP. Network LayerProvides path determination using a hierarchal logical address defined with a network portion and node portion, net.node.Examples: IP, IPX.
12. Which command listed below enables load balancing over two multiple paths for IPX on a Cisco router? A.) ipx routing 2 B.) ipx round-robin 2 C.) ipx maximum-paths 2 D.) ipx rip 2 E.) ipx sap 2 F.) ipx gns 2
C The default IPX routing protocol is IPX-RIP. By default, RIP selects the best path, and keeps only one route in its routing table. The ’IPX maximum-paths’ command allows RIP to load balance over up to 6 paths.
13. Which of the following is an example of the Physical Layer? A.) IP B.) LLC C.) SQL D.) DDP E.) Ethernet
E
14. What class address is 193.1.3.4 ? A.) C B.) B C.) multi-cast D.) broadcast E.) A F.) D
A
15. Novell NetWare has an Ethernet frame type called Ethernet_802.3. What is the matching Cisco command line keyword for this encapsulation method? A.) arpa B.) snap C.) novell-ether D.) sap E.) dix F.) gns
C Novell 802.2 = sap (contains 802.2 LLC headers) Novell 802.3 = novell-ether (NetWare proprietary) Ethernet_II = arpa (the Internet standard) snap = snap (field type set to ’AA’)
16. What would be the first command from global configuration mode to perform the following: 1. Enable IGRP on the router for interface E0 2. Tell IGRP to use an address of 157.89.4.4 255.255.255.0 3. Tell IGRP to provide routing updates for AS number 200? A.) router igrp 157.89.4.4 B.) network 157.89.4.0 255.255.255.1 C.) router igrp int e1 D.) router igrp 157.89.0.0 E.) network 157.89.4.0 F.) router igrp 200
F. You have to specify which routing protocol first. For IGRP you must also specify the autonomous system number. Router(config)#router igrp ? <1-65535> Autonomous system number
17. From global configuration mode, which command will create subinterface #1 for serial 0? A.) int sub serial 0 B.) int serial 0 subinterface 1 C.) int ss 0 D.) int s0.1 point-to-point E.) int serial 0 subinterface 0 F.) int s0
D. Command syntax for creating sub-interfaces:
18. The command ’ip host Dallas 157.89.8.64’ maps the host name Dallas with its IP address. What command would display all such mappings? A.) show dns B.) show dns entry dallas C.) show neighbors D.) show hosts E.) show ip table F.) show dns cache
D Router#show hosts Host Flags Age Type Address(es) www.eku.edu (temp, OK) 0 IP 157.89.8.2 dallas (perm, OK) 0 IP 157.89.8.64 Perm - permament static entries Temp - temporary usually resolved via DNS
19. The command ’show running-config’ displays the configuration script in RAM, but what other command could you use to show information about objects stored in RAM? A.) show startup-config B.) show all C.) show config D.) debug ram E.) show buffers F.) show start
E Packets are stored in memory locations called buffers during periods when the router becomes over-loaded with other requests.
20. Which of the following are examples of the Datalink Layer? (2 answers) A.) SQL B.) IP C.) MAC D.) TCP E.) LLC
C E MAC and LLC are the sublayers of the Datalink layer.
21. Which type of switching reads in the entire frame before forwarding it? A.) Fast Forward B.) Tabling C.) Cut-Through D.) Store-and-Forward E.) Inverse ARP F.) Routing
D Store-and-Forward is slower, but it checks the frame for errors before forwarding. This can actually help to improve overall network performance on noisy lines.
22. What is the standard ISDN term for a non-native analog telephone? A.) ET B.) LE C.) TE2 D.) TE1 E.) TA C Terminal Equipment 2 (TE2) does not support native digital ISDN. The analog device will require an external analog to digital converter.
23. Which layer of the 7 layer model is responsible for representing the application information between 2 different OS’s? For example, converting ASCII to EBCIDIC. A.) Transport B.) Physical C.) Application D.) Network E.) Session F.) Presentation
F. Presentation Layer Accepts data from application layer and negotiates data representation, syntax, compression and encryption. Examples: ASCII, EBCDIC, JPEG, GIF, PICT, MIDI, MPEG
24. How do you view all debugging that is currently enabled? A.) show running-config B.) show startup-config C.) show debug D.) debug update E.) show flash F.) show version
C.
25. Which of the following is an example of the Network Layer? A.) SQL B.) LLC C.) TCP D.) IP E.) Token Ring
D Most protocol suites have differnet OSI layer protocols within them. At layer 3, IP is for TCP/IP. TCP is layer 4. IPX is for IPX/SPX. SPX is layer 4.DDP is for Appletalk
26. Which type of switching is considered to be ’wire speed?’ A.) Inverted B.) Layer 4 C.) Cut-Through D.) Multiplexed E.) Layer 3 F.) Store and Forward
C
27. On an ISDN BRI interface, the control channel is the ’D’ channel. What is the rate of this channel? A.) 1.544 Mbps B.) 2.048 Mbps C.) 128 Kbps D.) 16 Kbps E.) 64 Kbps
D
28 Which commands are valid to turn off all debugging? ( 2 answers) A.) clear logging B.) no debug C.) no logging D.) clear debug E.) undebug all F.) no debug all
E F
29. Which of the following are valid Host ID’s for 157.89.9.50 /28 (12 bits of subnetting)? A.) 157.89.9.49 - 157.89.9.64 B.) 157.89.0.0 - 157.89.255.255 C.) 157.89.9.0 - 157.89.9.255 D.) 157.89.9.32 - 157.89.9.63 E.) 157.89.9.49 - 157.89.9.62
E Below is a very easy to use shortcut that requires no binary math: Figure out the mask: /28 = 255.255.255.240 Figure out the subnet multiple: 256-240=16 Subnets are 16,32,48,64,80, etc This is subnet 48, next subnet is 64, so the broadcast address is 63! Everything between the subnet (48) and broadcast (63) are the valid hosts. In this example, based on the given mask, the valid host ranges are 49-62.
30. What is a characteristic of Store and Forward switches? A.) They decrease latency. B.) They forward the frame before it is completely read. C.) They are the same a Cut-Through switching. D.) They read the entire frame and check CRC before forwarding. E.) They work at wire speed.
D
31. Given the following address: 157.89.8.64 255.255.0.0 which part represents the host portion of the address? A.) 0.89.8.64 B.) 0.0.8.64 C.) 157.89.0.0 D.) 157.0.0.0 E.) 0.0.0.64
B Using the subnet mask 255.255.0.0, the first 16 bits represent the network, the last 16 bits represent the host.
32. Which ISDN specification series deals with Concepts and Terminology? A.) F-Series B.) I- Series C.) World Series D.) 911-Series E.) Q-Series F.) J-Series
B The 2 most important ISDN specifications are Q & I: Q - Call setup and teardown. I - Concepts and terminology.
33. Which command would change the Cisco Discovery Protocol (CDP) update to 90 second intervals? A.) cdp router 90 B.) router cdp 90 C.) cdp timer 1.5 D.) set timer cdp=1.5 E.) cdp timer 90 F.) timer cdp 1.5
E
34. Which command will copy the routers configuration script from RAM to NVRAM? A.) copy running-config startup-config B.) NVRAM is read-only, so this is not possible. C.) save ram nvram D.) save ram E.) copy all
A
35. Which command listed below sets the banner message when someone connects to the router? A.) description # B.) login banner # C.) banner # D.) login description # E.) message # F.) banner motd #
F
36 What should be the first command to create an access-list that prevents all users on subnetwork 10.10.128.0, using subnet mask 255.255.192.0, from being able to telnet anywhere? A.) access-list 101 deny tcp 10.10.128.0 255.255.0.0 any eq telnet B.) access-list 101 deny tcp 10.10.128.0 0.0.192.255 any eq telnet C.) access-list 101 deny tcp 10.10.128.0 0.0.128.255 any eq telnet D.) access-list 101 deny tcp 10.10.128.0 0.0.63.255 any eq telnet E.) access-list 101 deny tcp 10.10.128.0 255.255.192.0 any eq telnet F.) access-list 101 deny tcp 10.10.128.0 0.0.127.255 any eq telnet
D Wildcard masks for an entire subnet are easy to figure out (shortcut): Local Broadcast - Subnet Mask = Inverted Wildcard Masks 255.255.255.255 -255.255.192. 0 ----------------- 0. 0. 63.255
37. What is the default LMI type for Cisco Routers that are using Frame-Relay? A.) IETF B.) ARPA C.) SAP D.) Cisco E.) Gandalf5 F.) Q933A
D Local Management Interface (LMI) types are Cisco, ANSI, and Q933A.
38. Which OSI Reference Layer is concerned with path determination? A.) Network B.) Physical C.) Transport D.) Session E.) Datalink
A The Network layer is where routing occurs. (If you don’t get this question right, there’s always a job at McDonalds!!)
39. Your Ethernet interface currently has the IP address of 1.1.1.1/24. You would like it to have a second IP address of 2.2.2.2/24. Which command will do that? A.) ip address 2.2.2.2 255.255.255.0 B.) ip address 1.1.1.1 2.2.2.2 255.255.255.0 C.) ip address 2.2.2.2 255.255.255.0 secondary D.) This cannot be done, you can only have 1 IP address per physical interface. E.) ip address 2.2.2.2 /24
C
40. MIDI and MPEG are examples of what layer of the OSI seven layer model? A.) Session B.) Transport C.) Presentation D.) Network E.) Application F.) Datalink
C The OSI Presentation layer includes EBCIDIC, ASCII, PICT, GIF, MIDI, and MPEG. Encryption can also occur at this layer.
41. Which global configuration command will tell the router to load the IOS from ROM at next boot? A.) This can not be done, only the first file in flash can be used. B.) boot system flash IOS_filename C.) config-register 0x2102 D.) boot system rom E.) boot system tftp IOS_filename tftp_address
D
42. What is the default subnet mask for a TCP/IP Class B address? (2 answers) A.) 255.255.0.0 B.) /8 C.) 255.255.255.0 D.) /24 E.) /16 F.) 255.0.0.0
A E
43. Most routing protocols recognize that it is never useful to send information about a route back out the direction from which the original packet came. This is an example of which routing technology? A.) Split Horizon B.) LMI C.) SYN, ACK D.) DLCI E.) Poison Reverse F.) Triggered Updates
A The golden rule of Split Horizon: Do not send any update packet back out the same interface that it was received or learned from. Poison Reverse is typically used on larger networks,where a more aggressive routing loop solution is required.
44. You want to set the telnet password to Boston. What would be the first command you need to execute from global configuration mode? A.) enable password boston B.) login boston C.) login password boston D.) set password=boston E.) password boston F.) line vty 0 4
F
45. Which command will start the process for creating a Cisco IOS file image backup to a network file server? A.) copy ios tftp B.) copy ios network C.) copy tftp flash D.) copy flash tftp E.) copy ios flash
D The IOS is stored in flash. The command format is: copy 学生大 [destination]
46. How do you determine which standard IP access lists are applied to interface E0 ? A.) show ip access-list B.) show access-lists C.) show ip interface e0 D.) show interface e0 E.) show access-list e0
C To see which specific protocol access-lists are bound to the interface, Show ip int e0 or Show ipx int e0 The command ’show access-lists’ will display all access lists that exist, not just the ones bound to a certian interface.
47. The Cisco Discovery Protocol (CDP) uses advertisements and discoveries. How does it send this information? A.) Over a SNAP-capable link. B.) Layer 3 broadcast. C.) CDP does not use advertisements. D.) Layer 2 multicast. E.) Layer 4 TCP. F.) SAP.
A D The Cisco proprietary protocol uses multicast, so that only other Cisco devices will listen to these packets. CDP requires a SNAP-capable link to transmit.
48. In the TCP/IP protocol stack, there are five classes of addresses. Which class is used for testing? A.) B B.) A C.) D D.) C E.) E
E A,B,C are valid for use on the internet D is multicast E is for research
49. Which subnet is the host 200.1.1.67 /26 on? A.) 200.1.1.32 B.) 200.1.1.128 C.) 200.1.1.0 D.) 200.1.1.16 E.) 200.1.1.64 E Shorthand notation /26 = 2 bits in the last octet = decimal 255.255.255.192 Shortcut: 256 - 192 = 64. Valid subnets are multiples of 64. (64, 128, 192, 256). The closest value to 67 is between 64 (the network) and 127 (the broadcast).
50. The Datalink layer works with which of the following: A.) Bits B.) Packets C.) Frames D.) Globules E.) Segments
C Physical - bits Datalink - frames Network - packets
51. Station A is transmitting data to station B, and expects an acknowledgment after every 400 bytes. After trasmitting data for a while, the two stations determine the line is reliable and change to expecting and acknowledgement every 600 bytes. This is an example of (pick the best answer only): A.) Count to infinity B.) BECN C.) Countdown timers D.) Sliding Windows E.) Split Horizon F.) Poison Reverse
D A TCP/IP ’window’ is the amount of data (number of bytes) that the sending station will trasmit before expecting an acknowledgement back. If the stations can change that window size on the fly, that is called a sliding window. This is done to optimize performance.
52. Which command can determine the path a routed packet takes through an internetwork? A.) telnet B.) traceroute C.) arp D.) plp E.) ping
B Traceroute uses a series of ICMP ’pings’ with decreasing time-to-live values for each hop to determine the path through a network.
53. What is one way to make more Flash memory available? A.) The command: copy flash to rom B.) Erase unused images from flash. C.) The command: erase start D.) This isn’t possible. Once you write to Flash, you must purchase new Flash SIMMS. E.) The command: erase flash *.* F.) The command: convert ram to flash
B You can think of FLASH as a virtual hard drive, that lets you add or delete files. If you entered the command, ’erase flash’, it would be like formatting that hard drive and wipe out all files and all data. The command ’erase flash *.*’ is not a valid Cisco command. By its very definition, Flash is electronically erasable.
54 Cisco routers can load a particular image of the Cisco IOS from flash. Which command listed below will cause the router to load ’C2500-11-3.bin’ from flash at next boot? A.) boot system C2500-11-3.bin B.) boot system flash C2500-11-3.bin C.) You can not have more the one IOS image in flash. D.) boot system file C2500-11-3.bin E.) boot system rom
B Router(config)#boot system flash ? WORD Configuration filename
55 What is the regional telco office called, where the customers local loop terminates? A.) CPE B.) DCE C.) Demarc D.) CO E.) DTE
D The Central Office (CO) is the Telephone Company (Telco) location nearest you.
56 Which protocol resolves an IP address to a MAC address? A.) DNS B.) DHCP C.) ARP D.) RARP E.) NBP
C The Address Resolution Protocol (ARP) sends out a broadcast to determine the MAC address from the IP address.
RFB2
640-407
Round 2 Enjoy.
1. Which ISDN specification deals with call Setup and Teardown? A.) J-Series B.) F-Series C.) Q-Series D.) I- Series E.) World Series
C The 2 most important ISDN specifications are Q & I: Q = Call setup and teardown. I = Concepts and terminology.
2. Which command will set a routers network name to ’myrouter’? A.) network name myrouter B.) display myrouter C.) hostname myrouter D.) name myrouter E.) network myrouter
C
3. When a Distance Vector routing protocol detects that a connected network has gone down, it sends out a special routing update packet, telling all directly connected routers that the distance to the dead network is infinity. This is an example of which routing technology? A.) Only Link State routing protocols have this intelligence. B.) Poison Reverse. C.) Triggered updates. D.) Garrison-4. E.) ICMP. F.) Split Horizon.
B Instead of just removing the route from the routing update, Poison Reverse sets the distance to ’infinity’ (for IP RIP this is a hop count of 16). This immediately makes the route invalid for all neighboring routers.
4 What is the standard ISDN term for a native ISDN modem? A.) TE3 B.) ET C.) LE D.) TE2 E.) TA
E The marketing term ’ISDN modem’ was created to help sell the ISDN idea to America. There is no such thing as an analog modulator demodulator for digital ISDN. The Terminal Adapter (TA) allows you to connect a PC to a digital ISDN line directly. In the real world, ISDN is digital, modems are analog.
5 Which of the following are Transport layer protocols? (3 answers) A.) NFS B.) SPX C.) UDP D.) TCP E.) IP
B C D
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