Booting and Memories

ROM: Read Only Memory. bootstrap startup program. operating system software. power on diagnostic test program.

POST: Power On Self Test

Flash Memory: ios image here. erasable reprogrammable rom.

RAM: Random Access Memory. stores operational info such as routing/switching tables and running config file. it is lost when router powered down or rebooted.

NVRAM: non volatile ram. holds router startup config file. contents are not lost on rebooting. NV(never)


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