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Topic: Restoring IOS ImagesSwitch
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Extension practice

Restoring IOS Images Practice Questions

Extension practice: recovering a device with a corrupt or missing IOS image.

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One solved question, so you can see how these are marked

A router's flash has been wiped and it now boots to the ROMMON prompt with no operating system. Which ROMMON command can download a new IOS image over the network from a TFTP server?

tftpdnld

tftpdnld is a ROMMON-level command (available when no IOS is loaded) that downloads a specified file from a TFTP server directly into flash, using environment variables to define the IP addressing and filename.

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All 2 Restoring IOS Images questions in this set

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  1. Before running tftpdnld in ROMMON to restore an IOS image, which environment variables must be set to identify the router's own address and the TFTP server?

    • BOOT, BOOTLDR, and CONFIG_FILE, which name the boot image and config file
    • IP_ADDRESS, IP_SUBNET_MASK, DEFAULT_GATEWAY, TFTP_SERVER, and TFTP_FILE
    • TFTP_SERVER and TFTP_FILE only, because tftpdnld learns its own address by DHCP
    • IP_ADDRESS and DEFAULT_GATEWAY only

  2. After tftpdnld successfully downloads a new IOS image into flash and the router is reset, what should be verified to confirm the restore was successful?

    • Only that the console shows a rommon prompt again
    • Confirm IOS boots and ping expected hosts, including the TFTP server
    • That the configuration register was changed to 0x2142
    • That the switch connected to the router has DHCP snooping enabled