cisco intro - Cisco Router Basics Router Components...

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Cisco Router Basics
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Router Components Bootstrap stored in ROM microcode brings router up during initialisation, boots router and loads the IOS. POST Power On Self Test - stored in ROM microcode checks for basic functionality of router hardware and determines which interfaces are present ROM Monitor stored in ROM microcode used for manufacturing, testing and troubleshooting Mini-IOS a.k.a RXBOOT/boot small IOS ROM used to bring up an interface and load a Cisco IOS into flash memory from a TFTP server; can also do a few other maintenance operations
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Router Components RAM holds packet buffers, ARP cache, routing table, software and data structure that allows the router to function; running-config is stored in RAM, as well as the decompressed IOS in later router models ROM starts and maintains the router Flash memory holds the IOS; is not erased when the router is reloaded; is an EEPROM [ Electrically Erasable Programmable Read-Only Memory ], that can be erased and reprogrammed repeatedly through an application of higher than normal electric voltage. NVRAM Non-Volatile RAM - holds router configuration; is not erased when router is reloaded
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Config-Register:
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cisco intro - Cisco Router Basics Router Components...

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