Queue for a Network Router has a finite capacity. If the queue is full, the router will drop a packet when it arrives. Thus, packet is lost
Packet Switching
A form of multiplexing
Data is divided into smaller segments called packets. This allows multiple data files to be transmitted simultaneously without interfering with each other. Each packet is a relatively small unit of data, so multiple packets can be transmitted simultaneously. If a portion of the data is corrupted, only the affected packets need to be resent.