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Cisco Memory & Flash

NVRAM

Non-Volatile Random Access Memory (NVRAM) is linked with storing configuration information used by Cisco IOS during system boot and launch. The NVRAM enables the functionality of the Cisco Software Configuration Register (SCR) in order to allow a device to be booted and selected from the different IOS images saved in flash memory.

Flash Memory

Flash memory offers the maximum number of uses compared to all other Cisco memories. The fundamental purpose of flash memory is to save multiple bootable IOS images that can be used by the system to restore boot setup after a boot failure. Most of the systems possess integrated flash memory which can be used during a boot process, but some enterprise-grade systems have the ability to boot using an IOS image stored on a removable flash drive.

 

Cisco servers possess four different types of cisco flash memory.

DRAM

Dynamic Random Access Memory (DRAM) is intended to work with computers having 2 requirements. One requirement would be the process that the processor memory performs as an operation that enables exclusive memory access by the processor, which is used during the software execution at the Cisco IOS platform. The second requirement would be the function that the shared memory performs by taking data in and out of the system and buffering it in the packet memory. 

EPROM

Erasable Programmable Read-Only Memory (EPROM) is a type of memory that cannot be changed by the user. It is installed with two components during the manufacturing phase of the system. One of the components is a boot loader. It allows a system (that may crash during boot) to find a bootable image in the flash memory and provide an alternate boot option. The second component is a ROM monitor, It comes with a user interface that provides an option for tackling any plausible failures of the EPROM chips.

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