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17: IOS Device Management
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Router Configuration Files
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These commands perform a merge process: copy startup-config
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running-config, copy tftp running-config, and configure terminal These commands perform an overwrite process: copy runningconfig startup-config and copy running-config tftp
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IOS devices do not automatically save their configuration in RAM: you must
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execute the copy running-config startup-config command to save the active configuration file to NVRAM
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Always back up your configuration before making any changes to it preferably
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IOS Image Files
When upgrading your IOS, make sure you download the version of IOS from
Cisco that contains the features that you purchased and verify that your router has enough flash and RAM for the new image Use the copy URL flash command to perform an IOS upgrade
Use the reload command to reboot your router
Remote Access to Your IOS Device
Use SSH for an encrypted remote access terminal session to your router The
transport input command can be used to limit what management protocols are allowed on the VTYs
Basic Troubleshooting
For layer 2 troubleshooting, use the show interfaces command and
CDP For layer 3 troubleshooting, use ping and traceroute For layer 7 troubleshooting, use telnet For detailed troubleshooting, use debug
CDP is used to learn basic information about directly connected Cisco
devices It uses a SNAP frame format and generates a multicast every 60 seconds It is enabled, by default, on a Cisco device
Two-Minute Drill
To execute an extended ping or traceroute, you must be at Privilege
EXEC mode Ping tests only if the destination is reachable, while traceroute lists each layer 3 device along the way to the destination
To suspend a telnet session, use the CTRL-SHIFT-6, X, or CTRL-^ control sequence The debug commands require Privilege EXEC access To disable all debug
commands, use no debug all or undebug all
17: IOS Device Management
SELF TEST
The following Self Test questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully, as there may be more than one correct answer Choose all correct answers for each question
Router Configuration Files
1 Which router commands perform an overwrite process (choose two) A B C D copy copy copy copy running-config startup-config startup-config running-config tftp running-config running-config tftp
2 Enter the router command to delete your configuration file in NVRAM: __________ 3 You have executed the show startup-config command and see the following message: %%Non-volatile configuration memory is not present Which of the following answers are correct about these two things (choose two) A B C D E F This command displays the running configuration in NVRAM This command displays the saved configuration in NVRAM This command displays the saved configuration in flash The message indicates that flash needs to be reformatted This message indicates that NVRAM needs to be reformatted This message indicates that there is nothing stored in this memory location
IOS Image Files
4 When backing up your IOS image from flash, which of the following will the copy flash tftp command prompt you for (choose three) A B C D TFTP server IP address Verification to copy Source filename Destination filename
5 What IOS command will display the version of software your device is running A show startup-config B show flash
Self Test
C show version D dir and show version
Remote Access to Your IOS Device
6 Enter the IOS configuration on the first five VTYs to allow only SSH access and to prompt for both a username and password for line authentication: __________ 7 Enter the IOS command that will create RSA public and private keys to encrypt and decrypt traffic for an SSH session: __________
Basic Troubleshooting
8 Which of the following is true of CDP A The show cdp neighbor command displays what version of software the neighbor is running B The no cdp run command disables CDP on an interface C CDP sends out broadcasts every 60 seconds D CDP can be used to validate layer 2 connectivity 9 Which router command would you use to test only layer 3 connectivity A B C D A B C D telnet show cdp traffic show interfaces traceroute
CTRL-SHIFT-X, CTRL-6, X CTRL-C
10 How would you suspend a telnet session 6
CTRL-SHIFT-6, X
17: IOS Device Management
SELF TEST ANSWERS
Router Configuration Files
1 A and D Copying to any other place besides RAM (running-config) causes an overwrite B and C are wrong because copying to RAM is a merge process, not an overwrite process 2 Use the erase startup-config command to delete your configuration file in NVRAM 3 B and F The show startup-config command displays a backed-up configuration in NVRAM If no configuration is stored there, you see the %%Non-volatile configuration memory is not present message A is incorrect because a saved configuration, not the running configuration, is found in NVRAM C and D are incorrect because these commands save the configuration to flash, not NVRAM You cannot reformat NVRAM; you can only copy over it or erase it, making E incorrect
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