When a router is powered on, where will the router first search for a valid IOS image to load by default?
Question
When a router is powered on, where will the router first search for a valid IOS image to load by default?
Solution
When a router is powered on, it first searches for a valid IOS image to load by default in the following sequence:
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Flash Memory: The router first looks in its own flash memory for the IOS image file. This is the most common location for the IOS image to be stored.
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TFTP Server: If the IOS image is not found in the flash memory, the router will then attempt to download it from a Trivial File Transfer Protocol (TFTP) server on the network. This requires the router to have network connectivity and the TFTP server to be properly configured with the correct IOS image file.
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ROM: If the IOS image is still not found, the router will finally look in its own Read-Only Memory (ROM). This is a last resort, as the IOS image in ROM is typically a very basic version used for emergency recovery purposes.
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