Cisco Certified Network Associate (CCNA) Practice Exam

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Why is flash memory erased prior to upgrading the IOS image from the TFTP server?

To ensure the router uses the new image as the default.
The router needs to validate the image currently in flash.
Erasing content is a request during the copy dialog.
Flash memory can only hold a single IOS image.

The correct answer is: Erasing content is a request during the copy dialog.

Erasing flash memory prior to upgrading the IOS image from the TFTP server is crucial to ensure that the new IOS image can be written without any conflict or remnants of the old image. When you issue the command to copy a new IOS image into flash memory, the process typically involves a prompt that requests whether to erase the existing content in flash memory. This is important to prevent any obsolete or incompatible residual data from interfering with the performance of the new image, which could lead to operational issues with the device. While the other options may touch on aspects of IOS operation or flash memory usage, the necessity of explicitly erasing flash memory comes down to maintaining a clean slate for the new image installation. This ensures that the selected image will operate correctly without the risk of collision with old configurations or images that may still reside in flash.