ddd

[JohnR]

An OS image cant be displayed from a term screen.. Image is usually executec from main RAM & loaded from 1 of severAL input sources.. The OS is organizd into routines that handle tasks assoc w differnt protocols suach as data movement, table and buffer management, routing upDAtes and user command execution

SIX ROUTER MODES;:
Wheyther accessed from a console or telnet session through a tty port, a router can be placed in several modes, each providing different functions:
USER EXEC MODE; lokk only mode which user can view but not chnge
PRIVLEDGED EXEC MODE; supports debugging & testing commands, detailed exam of router, manipulation of config files and access to config modes
SETUP MODE; presents a prompted dialog mode for first time config of router
GLOBAL CONFIGURATION MODE; implement powerfiyul one line commands that perform simple config tasks
OTHER CONFIGURATION MODES; provide more detailed multi-line configs
RXBOOT MODE; a maintenance mode that yu can use to recover lost passwords

Router Status commands:
Show Version: displays config of sys hardware, software version, names and sources of config files and boot image
SHOW PROCESSES; displays info about active processes
SHOW PROTOCOLS;displays configured protocols, shows status of all layer3 protocols
SHOW MEM; shows statistica abouyt router's memory, including free memory pools
SHOW STACKS monitoors the stack use of processes and interrupt routines & displays the reason for the last sys reboot
SHOW BUFFERSprovides statistics for buffer pools on router

SHOW FLASH shows info about Flash memory device on router

SHOW RUNNING-CONFIG (write term WTF? Cisco IOS release 10.3 or earlier) - displays active config file

SHOW STARTUO-CONFIG ( show config on IOS 10.3 or earlier) displays backup config


SHOW INTERFACES displays stats for all interfaces configed on router

Show running-config & show startup-config allow an admin to see current config of router and how router will start at next reboot
You can recognize an active config by the words CURRENT CONFIGURATION at the top. U can recognize a backup config file when you see a messahe at top that tells u how much non-volatile memory you have used


Show interfaces Serial - displays configurable parameters & real-time stats related to serial ints

Show Version - command displays info about the Cisco IOS software version that is currently running on rtouter

Show Protocols - EXEC command displays the global and int specific status of any configed lkayer 3 protocol]