This circuit approach means that the quality of the line between you and the person you're calling is consistent throughout the call, but a problem with any portion of the circuit - maybe a tree falls across one of the lines used, or there's a power problem with a switch - brings your call to an early and abrupt end. The circuit might involve a half dozen or more steps through copper cables, switches, fiber optics, microwaves and satellites, but those steps are established and remain constant for the duration of the call. When you make a telephone call to someone on the other side of the country, the telephone system establishes a stable circuit between your telephone and the telephone you're calling. Since the Internet is one huge network made up of tens of thousands of smaller networks, its use of routers is an absolute necessity. Regardless of how many networks are attached, though, the basic operation and function of the router remains the same.

As the number of networks attached to one another grows, the configuration table for handling traffic among them grows, and the processing power of the router is increased. It also protects the networks from one another, preventing the traffic on one from unnecessarily spilling over to the other. It joins the two networks, passing information from one to the other and, in some cases, performing translations of various protocols between the two networks. In performing these two jobs, a router is extremely useful in dealing with two separate computer networks. The router makes sure that information does make it to the intended destination.This is crucial for keeping large volumes of data from clogging the connections of 'innocent bystanders.' The router ensures that information doesn't go where it's not needed.

Maplestory packet sender