1.Start the router.
2.POST will run.(power on self test check the working conditions of component.if all well then),
3.bootstrap program will run and execute(it will find the location of IOS with the help of configuration register.)
4.default location is flash,tftp server and ROM.(config reg store in flash. it 2 byte in length.default no. is 0x2102.which tells the default location of ios.
5.If IOS image found then load the IOS.
6.Ios find the configuration file.
7.there are two configuration file:-startup-config and running -config.
8.startup-config store in NVRAM.does not lost data when power is off.it is used to save the current running file.
9.if there is no information available then it will go in setup mode.this is user interactive mode ask question to configure the file.
10.Running-config file is used to store the current information.it is store the data in RAM.
Components of Router:-
1.ROM:-STORE POST,BOOTSTRAP PROGRAM AND MINI IOS.
2.FLASH:-STORE THE IOS IMAGE.AND CONFIG REGISTER.
3.NVRAM:-STORE THE STARTUP-CONFIG
4.RAM :---- STORE THE CURRENT INFORMATION WHICH IS NEED TO SAVE IN START-UP-CONFIG.OTHERWISE DATA WILL WE LOST WHEN ROUTER IS POWER OFF.
2.POST will run.(power on self test check the working conditions of component.if all well then),
3.bootstrap program will run and execute(it will find the location of IOS with the help of configuration register.)
4.default location is flash,tftp server and ROM.(config reg store in flash. it 2 byte in length.default no. is 0x2102.which tells the default location of ios.
5.If IOS image found then load the IOS.
6.Ios find the configuration file.
7.there are two configuration file:-startup-config and running -config.
8.startup-config store in NVRAM.does not lost data when power is off.it is used to save the current running file.
9.if there is no information available then it will go in setup mode.this is user interactive mode ask question to configure the file.
10.Running-config file is used to store the current information.it is store the data in RAM.
Components of Router:-
1.ROM:-STORE POST,BOOTSTRAP PROGRAM AND MINI IOS.
2.FLASH:-STORE THE IOS IMAGE.AND CONFIG REGISTER.
3.NVRAM:-STORE THE STARTUP-CONFIG
4.RAM :---- STORE THE CURRENT INFORMATION WHICH IS NEED TO SAVE IN START-UP-CONFIG.OTHERWISE DATA WILL WE LOST WHEN ROUTER IS POWER OFF.
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