1. 
   Subnetwork
   A subnetwork, or subnet, is a logically visible subdivision of an IP network. The practice of dividing a network into two or more networks is called subnetting. All computers that belong to a subnet are addressed with a common, identical, most-significant bit-group in their IP address. This results...
   Found op http://en.wikipedia.org/wiki/Subnetwork
   
   
2. 
   Subnetwork
   An IP network in which a portion of the IP address is identical across all the devices connected to the subnetwork. A subnetwork is usually separated from other networks by a router or firewall. A trusted subnetwork contains hosts and routers that trust each other not to attack each other's security...
   Found op http://www.tedhaynes.com/newterms.html
   
   

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