subnetwork

noun
sub·​net·​work | \ˌsəb-ˈnet-ˌwərk \
variants: or sub-network
plural subnetworks or sub-networks

Definition of subnetwork 

: a portion of a network : a network within a network a healthcare subnetwork telecommunications subnetworks If the data's destination is within the local subnetwork, the bridge discards it, thus cutting down on unnecessary network traffic.— Jackie Fox

First Known Use of subnetwork

1924, in the meaning defined above

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The first known use of subnetwork was in 1924

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