Cisco Router Components Flashcards Preview

CCNA Chp 7 Managing a Cisco Internetwork > Cisco Router Components > Flashcards

Flashcards in Cisco Router Components Deck (9)
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the bootstrap is used to bring a router up during initialization. It boots the router up and then loads the IOS


POST (power-on self-test)

the POST is used to check the basic functionality of the router hardware and determines which interfaces are present


ROM monitor (ROMMON)

used for manufacturing, testing, and troubleshooting, as well as running a mini-IOS when the IOS in flash fails to load



Called the RXBOOT or bootloader by Cisco, the mini-IOS is a small IOS in ROM that can bring up an interface and load a Cisco IOS into flash memory. The mini-IOS can also perform a few other maintenance operations


RAM (random access memory)

Used to hold packet buffers, ARP cache, routing tables, and also the software and data structures that allow the router to function. Running-config is stored in RAM, and most routers expand the IOS from flash into RAM upon boot


ROM (read-only memory

Used to start and maintain the router. Holds the POST and the bootstrap program as well as the mini-IOS


Flash Memory

Stores the Cisco IOS by default. Flash memory is not erased when the router is reloaded


NVRAM (novolatile RAM)

Used to hold the router and switch confiuration. NVRAM is not erased when the router or switch is reloaded. The configuration register is stored in NVRAM


configuration register

Used to control how the router boots up. Value can be found in a sh ver and default is set to 0x2102.