Apr 23, 2011

the Router

Connecting to the Router
We have three ways:
  1. Auxiliary Port / Phone line 
  2. Console Port / Rj-45 / Console Cable or Console cable-rollover
  3. Telnet /  (USER MODE) ip net - 10Baset t
Cisco Router Components 
  1. Bootstrap: boot the router & then load the IOS.    [Microcode of the Rom]
  2. POST (Power On Self Test): check the basic functionality of the router hard ware.    [Microcode of the Rom]
  3. Rom monitor: testing & troubleshooting.    [Microcode of the Rom]
  4. Mini-IOS (Rx-boot / boot-loader): small IOS in Rom. load a Cisco IOS into flash memory.
  5. RAM:  hold packet buffers, ARP cache, routing table.
  6. ROM: star & main tent the router.
  7. Flash memory: hold the Cisco IOS, NOT erased when the routers is reloaded, it is EEPROM.
  8. NVRAM: hold the router & switch configuration.
Cisco Router 
  • Basic IOS: ROM
  • Boot strap: ROM
  • Diagnestics: ROM
  • Current IOS: Flash
  • Start up configuration: NVRAM
  • Running configuration: RAM

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