Booting Process of Cisco Router

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 BootStrap program

                     
  • When Power on the Router then  First it will do POST (Power on Self Test ) . The POST analyze Hardware Component of Router . It verify that all Router interface properly working or not . After the POST it will boot itself with help of Program which is store in ROM.
  • After POST it search the Location of  IOS in  flash memory ( Internetwork OS). Bootstrap program responsible for finding IOS Program. 
  • After IOS found it will loaded in to RAM.
  • After loading IOS it will go to NVRAM for Valid Configuration , If Configuration is available in NVRAM , then it will go to CLI mode.

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