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The network switch — the device intended for connection of several sites of a computer network within one segment. Unlike the hub which extends the traffic from one online unit to all the rest, the commutator transfers given only to directly receiver. It raises productivity and safety of a network, saving other segments of a network of necessity (and possibilities) to handle the data which it did not intend.
 If the host-receiver MAC-address is yet known, the frame will be  duplicate on all interfaces. In due course the commutator builds 
the complete table for all ports and as a result the traffic is localised.
If the host-receiver MAC-address is yet known, the frame will be  duplicate on all interfaces. In due course the commutator builds 
the complete table for all ports and as a result the traffic is localised.
Such sort has the commutator in our program. It fulfils all functions described above. 
 the device has a possibility to 
look the switching table.
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| Hub | On level above | Router |