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Extension practice

Backing Up Config & IOS Practice Questions

Extension practice: TFTP backup/restore of configurations and IOS images.

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

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

Which command copies a router's saved startup configuration to a TFTP server?

copy start tftp

The copy command syntax is source then destination, so copy start tftp reads from startup-config in NVRAM and writes it to the TFTP server.

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All 5 Backing Up Config & IOS questions in this set

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

  1. An engineer runs copy tftp run and pulls an older saved config into the running configuration. What actually happens to the running configuration?

    • It is merged with the incoming file, only overlapping settings change
    • It is completely erased first, then replaced by the incoming file
    • The router refuses the copy because running-config cannot be overwritten this way
    • Only interface configuration is affected, everything else is untouched

  2. Why would an engineer generally prefer copying a backup file to startup-config and reloading, rather than copying it straight into running-config?

    • Copying to startup-config fully overwrites the file, giving a clean and predictable result, while a running-config copy only merges changes
    • Startup-config copies happen instantly with no reload required
    • Running-config cannot be restored from TFTP at all
    • Startup-config copies automatically validate syntax before applying

  3. Before copying a new IOS image into flash from a TFTP server, which command should be checked first to confirm there is enough free space?

    • show flash
    • show version
    • show running-config
    • show ip interface brief

  4. After copying a new IOS image into flash with copy tftp flash, which additional step is required so the router actually boots that image on the next reload?

    • Add a boot system flash command pointing to the new filename, then save the configuration
    • Nothing else is needed, the router always boots the newest file in flash
    • Rename the old image file to match the new image's filename
    • Set the configuration register to 0x2142

  5. A router is being upgraded using FTP instead of TFTP to pull a new IOS image from a server. Which two commands must be configured on the router first?

    • ip ftp username and ip ftp password
    • ip tftp source-interface and ip tftp blocksize
    • ip ftp server and ip ftp blocksize
    • username and password under line vty 0 4