Router
Is A Intelligent Networking Device That Operates On The Network Layer Of The Osi Model.Reference Model.It Maintain Routing Table To Guide Best Route For Transferring Table Packet From One Location To Another.
Interface on router:-

Console port:-router to pc with com port to access router physically.
Ethernet port:-this port is used to connect router to lan.
Auxiliary port:-this port is used to connect router to modem (for dial-up)connection.
Integrated service digital network(isdn):- this port is used to connect router to lan.
Basic rate interface.

Components Of Router:-
Microprocessor:-it is used to decide to best route.

Flash rom:-it contain ios nd bootstarp program.

Dram:-it contain running-configuration.

Nvram:-it contain startup-configuration.

Router configuration modes:-
Cli mode=all configuration mode

Router#>privilege mode.use to view,erase,save,copy etc.

Router#config-t>used to configure router settings.

Router(config)#>global configuration mode.

Some usefull cmd for router:-

>Show running configuration.

>Sh ip route

>to copy=copy running config startup config.

>sh int f0/0=for specific port info           
    
>ctrl+z = to exit.

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