![]() Each router introduces a small delay, since packets are queued there, making the signal delay far greater than the distance might indicate. ![]() On the Internet, this delay is not only determined by the distance, but also by the number of routers that lie between the source and the destination (often more than 20). The signals traval fast (nearly at light speed), yet there is a measurable delay until it arrives, even on Local Area Networks (LANs). It means the raw amount of data that can be sent to the destination, regardless of the time that it needs to arrive and any errors that occur underway. This is often called "bandwidth", even though this term is incorrect. First, we have to distinguish between throughput and signal delay. What is lag? In a network, there is always a certain time that a signal needs to reach its destination.
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