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...Cisco devices s lan switches routers hardware components depending on the model series at least mother board back plane cpu risc mips or motorola memory bus i o interfaces modules flash holds ios is not erased when router reloaded an eeprom created by intel that can be and reprogrammed repeatedly through application of higher than normal electric voltage nvram non volatile ram configuration packet buffers arp cache routing table software data structure allows to function running config stored in as well decompressed later models rom starts maintains what internetwork operating system all a derivative bsd unix custom built for each platform pre packaged static complete upgraded features available different versions price gui but users still prefer command line designed independent...