It may allocates resources when they accept communications, so that certain performance can be better guaranteed. Connectionless network transmit data from a end-system to another without establishing a connection. Packet switching network chops data into small units and sends one at a time. These units are called packets. Multicasting means propagation of information from one source to a subset of the potential destinations.
Broadcasting means propagation of information from one source to all potential recipients.
11.4.2.2 LANs LANs are generally used on campuses and in companies which connect local computers together. All are connectionless networks. Their access speed are shown in the following. If many stations use the shared medium, the bit rate is much different. For example, for a hundred stations transmitting frames of 1000 bits on average over a 10 Mbps Ethernet, the maximum aggregate bit rate is 3.6 Mbps.