Chapter 1 Notes - Not all routers have Console Port –...

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Chapter 1 – Introduction to Routing and Packet Forwarding Inside the Router Routers are Computers Routers determine the best path to forward packet to destination Router examines dest. IP address & searches for best match with a network add. in routing table Routing table also includes interface to be used to forward the packet Router CPU and Memory Nonvolatile RAM (NVRAM) and boot flash memory used for storing the ROMMON boot code as well as NVRAM data Synchronous dynamic RAM (SDRAM) used for holding the running configuration and routing tables, and for supporting packet buffering Advanced Integration Module (AIM) option that offloads processor- intensive functions such as encryption from the main CPU Flash memory used for storing the software image, config files, and log files Hardware Components: AUX port is a management port used for remote configuration of the device. It is most often used for the connection of a modem to manage the device when the network path has failed.
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Unformatted text preview: Not all routers have. Console Port – allows for local configuration of device (management port) User Interface Dual UART – Universal Asynchronous Receiver/Transmitter – 2 access methods (DUAL) through AUX and Console ports CompactFlash Memory Card – stores Cisco IOS software image on either SIMM or PCMCIA Boot ROM – holds bootstrap, ROM monitor and optionally scaled-down version of IOS software; shares flash memory with NVRAM NVRAM – holds startup config System Control ASIC – controls the flow of data between memory, interfaces and the CPU SDRAM DIMMs – holds running config, routing table & other dynamic structures Boot-up Process Performing the POST Execute Bootstrap Loader Locate the IOS Load the IOS Locate the config file Execute the config file or enter setup mode Routers Operate at layers 1, 2, and 3 (Physical, Data Link, Network)...
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Chapter 1 Notes - Not all routers have Console Port –...

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