Which type of memory stores the configuration of a router or switch by default?
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A. B. C. D.A.
The type of memory that stores the configuration of a router or switch by default is NVRAM (Non-Volatile Random Access Memory).
NVRAM is a type of memory that retains its contents even after power is removed, making it an ideal storage location for critical information such as device configurations. NVRAM is also typically used to store the device's bootstrap program, which is loaded into memory during the boot process.
RAM (Random Access Memory) is another type of memory used by routers and switches, but it is volatile, meaning that its contents are lost when power is removed. RAM is used to temporarily store data and instructions that are being actively processed by the device, including the running configuration.
ROM (Read-Only Memory) is a type of memory that contains firmware, such as the device's operating system and basic input/output system (BIOS), that is used to boot the device. ROM is non-volatile, but it is read-only and cannot be modified.
Flash memory is another type of non-volatile memory that is commonly used in routers and switches. It is typically used to store the device's operating system and other software images, as well as backup copies of configurations. Unlike NVRAM, flash memory can be erased and rewritten, making it useful for upgrading device software.
In summary, the correct answer to the question is C. NVRAM stores the configuration of a router or switch by default, while RAM is used to temporarily store data and instructions, ROM contains firmware, and flash memory is used for software and configuration storage.