Description: bootstrap: stored in the ROM of the micro-code (microcode) in the time used to initialize the start router, and then load the IOS POST: stored in the ROM of the micro-code, used to check the hardware basic configuration is normal, then to decide which interface is available ROM monitor: stored in the ROM of the micro-code, the role of test and suspect other exclusive Mini-IOS: Cisco call RXBOOT or bootloader, which is stored in the ROM in, IOS simplified version, used to IOS is loaded into the flash memory in the RAM (random-access memory): to save the data packet cache, ARP cache, routing tables, and running-config configuration file. some of the router on, IOS can run from RAM
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