Broadcast Domain Definition

A broadcast domain is the portion of a computer network that is reachable by a broadcast.

A broadcast is the transmission of a message to all hosts (i.e., computers) on the network or part thereof (i.e., network segment) simultaneously.

In contrast to a collision domain, which is determined at the data link layer (the second layer of the OSI reference model) and is typically confined to a network segment in a LAN (local area network), a broadcast can be initiated at any of several layers, and it thus can be either confined to a single segment or routed across multiple segments.

Created October 6, 2005.
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