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A number that uniquely identifies a network board, also known as station address, physical node address, and node address.Every node must have at least one network board, by which the node is connected to the network. Each network board must have a unique node number to distinguish it from all other network boards on that network.Node numbers are assigned in several ways, depending on the network board type. For example, Ethernet and token ring boards are factory-set (with no two Ethernet boards having the same number), while ARCnet board numbers are set with jumpers or switches. Node addresses are dynamically assigned each time the node is started.