BOOTING PROCESS
POST
Power on Self Test
(verifies) the hardware
It is a kind of
diagnostic utility that performs essential tests in the router such as verifying
whether the important hardware components are present or not, checking module
slots for new hardware, etc.
ROM
ROM ( Read only memory ) stores four components POST, Bootstrap program, mode and Mini IOS(operating system).
Flash
Flash is a nonvolatile memory. Data store in
flash is not lost when you turn the router off. You could assume flash as hard
disk of router. Like data stored in hard disk remain safe, same as data stored
in flash remain safe. Router uses flash to store IOS(operating system) image.
During the boot process router load IOS(operating system) file from flash to
ram.
Flash is a nonvolatile memory. Data stored in flash is
not lost when you turn the router off. You can assume flash as hard disk of
router. Like data stored in hard disk remains safe, data stored in flash also
remain safe. Router use flash to store IOS image. During the boot process
router loads IOS file from flash to RAM.
NVRAM
NVRAM is another
permanent memory. Data stored in NVRAM is also remain safe. Router use NVRAM to
store configuration files. NVRAM uses a battery to maintain the data during the
power off stage.
RAM
RAM is a fast
performing temporary memory. Information kept in RAM does not persist after
power off. Everything in RAM is cleared, when you turn off the router. In an
active router, RAM holds all the data required to work the router.
BY:-MANTHAN PATEL
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