BootROM is used for completely the storage of the startup diagnostic code (ROM Monitor). The principle activity for the BootROM is to carry out some diagnostics throughout bootup on the router, Energy On Self Check (POST), and to load the Cisco IOS software program from the Flash to the Reminiscence.
Flash reminiscence is a non-volatile reminiscence storage that doesn’t unfastened the data by turning the ability off. Flash reminiscences exist in lots of types in routers, inside flash, exterior flash card and even USB flash playing cards.
Flash is used for everlasting storage of a full Cisco IOS software program picture in compressed type. In Juniper routers Flash shops the JUNOS picture and the configuration information.
Juniper router additionally has an inside laborious drive that shops a backup copy of the JUNOS picture, log information and every other required information.
RAM is a unstable information storage kind of reminiscence through which saved info is misplaced with energy off. RAM stands for random entry reminiscence the place the phrase random mirror that saved information could be accessed in any order. RAM could be SRAM or DRAM. DRAM is utilized in extra functions for the simplicity of its construction and decrease value.
RAM is used at run time for executable working system code, and its subsystems, routing tables, caches, working configuration, suites, and so forth.
NVRAM stands for non-volatile random entry reminiscence and is used to explain any kind of RAM that saved information shouldn’t be misplaced by energy turned off. NVRAM is used for writable everlasting storage of the startup configuration in CISCO routers.
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