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Extension practice

Restoring IOS Images Practice Questions

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

Author-reviewed by LabFabric · 7 September 2026 · Report a content issue

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

Answers and explanations appear when you work through the set above.

  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?

    • HOSTNAME and DOMAIN_NAME
    • IP_ADDRESS, IP_SUBNET_MASK, DEFAULT_GATEWAY, TFTP_SERVER, and TFTP_FILE
    • BOOT_IMAGE and CONFIG_FILE
    • VLAN_ID and NATIVE_VLAN

  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
    • That the router boots IOS correctly and can reach expected hosts such as the TFTP server and neighboring devices by ping
    • That the configuration register was changed to 0x2142
    • That the switch connected to the router has DHCP snooping enabled