May 2006
Intermediate to advanced
480 pages
12h 20m
English
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A.3 Memory
CISCO routers usually have three types of memory:
- RAM: This is usually used by the operating system (the running operating system is located there). The content of RAM is erased when the router is shut down or there is a power outage. This memory type is usually labeled as
systemin commands. - FLASH: This memory type is not erased when a power outage occurs. It stores the operating system that is transferred into RAM when the router is switched on.
- NVRAM: This is a smaller rewritable memory that is not erased when a power outage occurs. The router stores copies of the IOS configuration here.
Individual memory types act as file systems. Labeling is similar to the MS-DOS system, although the A:, B:, C: etc drives are replaced by a memory ...
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