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NVRAM
On NVRAM.
NVRAM Stores startup-config. The IOS (Internetwork Operating System) is stored in the flash. Both flash and NVRAM are non volatile storages but there is a major difference.
When a Cisco router is booted up for the first time, or is reloaded, the router will look into its Non-Volatile RAM (NVRAM) for the startup configuration file. Setup Mode is usedto configure a Cisco router or switch after start up to create a startup configuration file.
On NVRAM.
Global configuration
NVRAM
flash,nvram,ram
The NVRAM is the primary place a router or switch stores the configuration file which tells the device how to operate.
NVRAM
you can use 2100 when you have a corrupt nvram and your router refuses to boot up
NVRAM, TFTP,Console