CCNA – Cisco IOS Questions 3
Here you will find answers to Cisco IOS Questions – Part 3
Note: If you are not sure about the boot sequence of a router/switch, please read my Cisco Router Boot Sequence Tutorial.
Question 1
Refer to the exhibit. A router boots to the prompt shown in the exhibit. What does this signify, and how should the network administrator respond?
| rommon 1> |
A. This prompt signifies that the configuration file was not found in NVRAM. The network administrator should follow the prompts to enter a basic configuration.
B. The prompt signifies that the configuration file was not found in flash memory. The network administrator should use TFTP to transfer a configuration file to the router.
C. The prompt signifies that the IOS image in flash memory is invalid or corrupted. The network administrator should use TFTP to transfer an IOS image to the router.
D. The prompt signifies that the router could not authenticate the user. The network administrator should modify the IOS image and reboot the router.
Answer: C
Explanation
If a Cisco router boots in ROMmon mode, it means:
+ The value of the configuration register is set to XXX0 (the boot field – fourth bit – is 0)
+ The router is unable to locate a valid Cisco IOS software image (you can use the “dir flash:” command in ROMmon mode to look for the IOS in the Flash then try to boot that flash with the “boot flash:” command).
If the IOS image is invalid or corrupted, the fastest way to re-install a new Cisco IOS software image on the router is to copy a new one from TFTP (with “tftpdnld” command).
Question 2
What should be done prior to backing up an IOS image to a TFTP server? (Choose three)
A. Make sure that the server can be reached across the network.
B. Check that authentication for TFTP access to the server is set.
C. Assure that the network server has adequate space for the IOS image.
D. Verify file naming and path requirements.
E. Make sure that the server can store binary files.
F. Adjust the TCP window size to speed up the transfer.
Answer: A C D
Question 3
Which two privileged mode cisco ios commands can be used to determine a cisco router chassis serial number? (choose two)
A. show inventory
B. show flash filesys
C. dir flash:|include chassis
D. show diag
E. show controllers
Answer: A D
Question 4
Which command helps a network administrator to manage memory by displaying flash memory and NVRAM utilization?
A. show secure
B. show file systems
C. show flash
D. show version
Answer: B
Question 5
A network administrator changes the configuration register to 0×2142 and reboots the router. What are two results of making this change? (Choose two)
A. The IOS image will be ignored.
B. The router will prompt to enter initial configuration mode.
C. The router will boot to ROM.
D. Any configuration entries in NVRAM will be ignored.
E. The configuration in flash memory will be booted.
Answer: B D
Explanation
The router bypasses the startup configuration stored in NVRAM during its boot sequence so the router will enter initial configuration mode. This feature is normally used during a password recovery procedure.
Question 6
Refer to the exhibit. For what two reasons has the router loaded its IOS image from the location that is shown? (Choose two)
|
Router1> show version ROM: System Bootstrap, Version 11.1(11855) [beta 2], INTERIM SOFTWARE Router1 uptime is 23 hours, 33 minutes cisco 7206 (NPE150) processor with 57344K/8192K bytes of memory.
Configuration register is 0×2102 |
A. Router1 has specific boot system command that instruct it to load IOS from TFTP server.
B. Router1 is acting as a TFTP server for other routers.
C. Router1 cannot locate a valid IOS image in flash memory.
D. Router1 defaulted to ROMMON mode and loaded the IOS image from a TFTP sewer.
E. Cisco routers will first attempt to load a image from TFTP for management purposes.
Answer: A C
Explanation
When powered on, the router first checks its hardware via Power-On Self Test (POST). Then it checks the configuration register to identify where to load the IOS image from. In the output above we learn that the Configuration register value is 0×2102 so the router will try to boot the system image from Flash memory first.
But we also see a line “System image file is “tftp://112.16.1.129/hampton/nitro/c7200-j-mz”. Please notice that this line tells us the image file that the device last started. In this case it is from a TFTP server. Therefore we can deduce that the router could not load the IOS image from the flash and the IOS image has been loaded from TFTP server.
Note:
If the startup-config file is missing or does not specify a location, it will check the following locations for the IOS image:
+ Flash (the default location)
+ TFTP server
+ ROM (used if no other source is found)
Question 7
Which Cisco IOS command can help to determine the timing of various debug events, relative to each other, when you are debugging a complicated router issue?
A. service timestamps log datetime msec
B. clock calendar-valid
C. show clock detail
D. service timestamps debug datetime msec
Answer: D
Explanation
The service timestamps command is used to configure the system to apply a time stamp to debugging messages or system logging messages. If the service timestamps command is specified with no arguments or keywords, the default is service timestamps debug uptime.
The “service timestamps debug datetime msec” command tells the device to indicate time-stamping for system logging messages in the format of MMM DD HH:MM:SS.mmm (Month, date, hour, minute, second, millisecond corresponding). For example: Sep 1 06:45:26.523.
Note: Answer A “service timestamps log datetime msec” is used for logging messages, not debugging messages.
(Reference: http://www.cisco.com/en/US/docs/ios/fundamentals/command/reference/cf_r1.html#wp1030116)
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show diag and show inventory and show file systems are new to me — are any of these on packet tracer?
I am not finding show file systems on cisco website??!!
Why not? == I did a search for show commands?!
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Which statement about an ETHERNET address is accurate?
A.The address that is used in an ETHERNET LAN directs data to the proper receiving location.
B.The source address is the 4-byte hexadecimal address of the NIC on the computer that is generating the data packet.
C.The destination address is the 8-byte hexadecimal address of the NIC on the LAN to which a data packet is being sent.
D.The destination and source addresses both consist of an 8-byte hexadecimal number.
there are 2 answers and i confuse which one is right A or D , plz help
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Only A, because b c d tell us about 4 or 8 bytes which have nothing to do with ethernet 6-byte mac addresses.
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which command will show the mac addresses of the station connected to stations connectec to swithc ports?
A. Show Mac-address
B. Show arp
C. Show table
D. Show switch port.
The correct answer in the dumps is option A. Is it because the “show mac-address” is short for the command “show mac-address-table” ? waitinfg for the response from you guys specially 9tut and Xallas.
…..I read somewhere that, show arp is a L3 command and Show mac-address-table is the L2 command, but arp table can only be populated in the switch if the management interface of the switch (vlan 1) was used to access other resources in the same subnet; now since we dont have enough reasons to believe that the management interface was used to reach other hosts in the network, then the show mac-address remains to be the best close answer despite its incompletenes
Reference:https://supportforums.cisco.com/thread/2057890
Moreover, i have just learned another clue from the packet tracer…the show arp command doesnt show the ports workstations are connected to, and since the question is asking about switch ports and their connectd warkstations then is completely eliminated as the possible answer…..show mac-address is the last one standing
Switch#show mac-address-table
Mac Address Table
——————————————-
Vlan Mac Address Type Ports
—- ———– ——– —–
1 0001.429a.ebcb DYNAMIC Fa0/3
1 0009.7c5b.07ca DYNAMIC Fa0/5
1 00e0.a32e.a765 DYNAMIC Fa0/2
———————————————————————————————————
———————————————————————————————————
Switch#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.1.2 0 00E0.A32E.A765 ARPA Vlan1
Internet 192.168.1.3 1 0001.429A.EBCB ARPA Vlan1
Internet 192.168.1.5 5 0009.7C5B.07CA ARPA Vlan1
Internet 192.168.1.9 – 0090.21E6.23E3 ARPA Vlan1
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Questions 6 is confusing me. I would like to see the wording ask,
“Refer to the exhibit. For what two reasons might the router have loaded its IOS image from the location that is shown? (Choose two)”
or
“Refer to the exhibit. What are two possible reasons that would cause the router to have loaded its IOS image from the location that is shown?”
Because is seems that if, “Router1 has specific boot system command that instruct it to load IOS from TFTP server.”
then it won’t try to locate an IOS in Flash first.
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hai guys i really don’t understand why E is not correct in Q5
A network administrator changes the configuration register to 0×2142 and reboots the router. What are two results of making this change? (Choose two)
A. The IOS image will be ignored.
B. The router will prompt to enter initial configuration mode.
C. The router will boot to ROM.
D. Any configuration entries in NVRAM will be ignored.
E. The configuration in flash memory will be booted.
@sara .. only A is correct.. becoz ethernet has its SA n DA .. only 6 bytes.
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Concerning Q3 regarding the command Show inventory i tried many routers but i did not find any command like.
so i think the correct answer will be “SHOW CONTROLLER SERIAL” if any one have comment plz let me know
@dody: two reasons, first 0×2142 means “ignore the configuration”, second, there is NO configuration in FLASH, configurations are stored in RAM and NVRAM.
Hi guys,
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what’s the difference betwen show version and show file systems, it is supposed to show the same flash and RAM memory, but the flash is not the same.
Someone knows the difference between
show files systems and show version???
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Forget it, guys
I’ve checked it on GNS3 and it is correct and the same
Show file systems and show version give the same NVRAM and flash memory
don’t try on packet tracer, NVRAM it’s going to be diferent with Show file systems and show version
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show file systems was a surprise to me — saw it here on this site first – dont remember it from class or cisco site
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Hello Guys, some of the commands which you see are not supported by Cisco packet tracert but you can check them out with GNS3 or with real physical routers and it will show you the outcomes
Cheers,
Jorge
Here you have the output:
R1#SHOw FILe SYstems
File Systems:
Size(b) Free(b) Type Flags Prefixes
* 64016384 12822561 flash rw flash:
29688 23590 nvram rw nvram:
R1#
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