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When bootstrap is run during the boot process of a router, it looks for the boot field in the configuration register. According to the hexadecimal code, it chooses which operating system (OS) to load into RAM. The table below shows the values used in the boot field and the choices made by the router to load the OS. Boot Field Choice of Operating System 0 ROMMON OS 1 The first IOS found in Flash memory 2-F Try each boot system command in the startup-config file in the given sequence till one works. ? If none of the boot system commands work, load the first IOS file found in Flash memory. In the 640-802 exam resources, Cisco Certified Network Associate, you will cover every field and category in CCNA helping to ready you for your successful Cisco Certification. ?