<P> The distinction between broadcast and collision domains comes about because simple Ethernet and similar systems use a shared transmission system . In simple Ethernet (without switches or bridges), data frames are transmitted to all other nodes on a network . Each receiving node checks the destination address of each frame, and simply ignores any frame not addressed to its own MAC address or the broadcast address . </P> <P> Switches act as buffers, receiving and analyzing the frames from each connected network segment . Frames destined for nodes connected to the originating segment are not forwarded by the switch . Frames destined for a specific node on a different segment are sent only to that segment . Only broadcast frames are forwarded to all other segments . This reduces unnecessary traffic and collisions . </P> <P> In such a switched network, transmitted frames may not be received by all other reachable nodes . Nominally, only broadcast frames will be received by all other nodes . Collisions are localized to the network segment they occur on . Thus, the broadcast domain is the entire inter-connected layer two network, and the segments connected to each switch / bridge port are each a collision domain . </P> <P> Not all network systems or media feature broadcast / collision domains . For example, PPP links . </P>

Where does a broadcast domain exist in a switched network
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