LAN Topologies - TechTarget

C H A P T E R2 LAN TopologiesThe application in use, such as multimedia, database updates, e-mail, or file and print sharing, generally determines the type of data transmissions fit into one of three categories: Unicast Multicast BroadcastUnicast With unicast transmissions, a single packet is sent from the source to a destination on a network. The source-node addresses the packet by using the network address of the destination node. The packet is then forwarded to the destination network and the network passes the packet to its final destination. Figure 2-1 is an example of a unicast 2-1 Unicast Page 13 Wednesday, November 14, 2001 3:28 PM14 Chapter 2: LAN TopologiesMulticastWith a multicast transmission, a single data packet is copied and forwarded to a specific subset of nodes on the network. The source node addresses the packet by using a multicast address.

case is a function of the LAN-attached station’s network interface card (NIC). Because each NIC in a LAN-attached station is a repeater, each LAN station will repeat any signal that is on the network, regardless of whether it is destined for that particular station.

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