. dram or sdram?aserves two functions: it stores the running configuration and routing tables and is used for packet buffering by the router's network interfaces. the cisco ios software executes from dram memory.
. nonvolatile random-access memory (nvram)?astores the system configuration file and the virtual configuration register. (for more information, see appendix c, "virtual configuration register.")
. flash memory?astores the operating system software image. you can also add flash memory on pcmcia cards and compact flash cards, depending on the router.
. eprom-based memory?astores the rom monitor, which allows you to boot an operating system software image from flash memory or pcmcia memory.
table 1-1 through table 1-4 list processor and memory specifications for the routers.
