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After I reset my Cisco Router 1841, It started to give error messages like below;  %Error opening tftp://255.255.255.255/network-confg (Timed out) %Error opening tftp://255.255.255.255/cisconet.cfg (Timed out) %Error opening tftp://255.255.255.255/router-config(Timed out) %Error opening tftp://255.255.255.255/ciscotr.cfg (Timed out) Actually these error messages are caused due to default configurations in Cisco IOS Software, which attempts to access the service configuration files from a network Trivial File Transfer Protocol (TFTP) server, and if the router is unable to acces the TFTP Server then it start displaying these messages. Yo can stop displaying these error message by entering following commands at Cisco CLI  Router#config terminal  Enter configuration commands, one per line.  Router(config)#no service  (this is command to stop these error messages) config Router(config)#end Router#write

What does Chassis means? A Chassis is a frame/housing for mounting the circuit components for Cisco Switches and Routers or any type of devices that provides power and a high-speed backplane. The frame also protects all of the vital internal equipment from dust, moisture, and tampering.  Making the Chassis to define even easier is;  A chassis is an enclosure; a container that holds things together... i.e. an egg carton holds eggs together inside. A chassis does the same thing; it holds the important things inside like wiring, power supplies etc.  What does Backplane means? Backplane is a circuit board with sockets that allows  Supervisor engines  Cards or modules to be inserted into these sockets and connect them to each other. Backplane is mounted on the Chassis.  Modules or line cards provide different types of interfaces, but the processing of packets is usually done in the Supervisor engine. Backplane is the medium for data flow between modules and Supervisor engines.  Additionall

Supervisor Engine is a module that is installed in the Cisco Chassis-based Catalyst Switches or Routers. Supervisor engine contains nearly all the same components of a fixed Cisco Switches or Routers. These Supervisor engines come in a variety of different types with different functionalities and are installed in the Switches/Router Chassis as per requirements of the network types. Benefits of Supervisor Engines By installing Latest Supervisor Engines in your existing investments (Switches and Routers) you can scale system performance and integrate next-generation services into your Networks. Within a single multilayer switch chassis, two supervisor modules with integrated route processors can be used to provide hardware redundancy. If an entire supervisor module fails, the other module can pick up the pieces and continue operating the switch. The supervisor engine contains the following integrated daughter cards that perform forwarding and routing and provide the protocols suppo