subnetting


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subnetting

Dividing a network into smaller subgroups. See subnet and subnet mask.
References in periodicals archive ?
Balchunas, "IPv4 Addressing and Subnetting v1.41," pp.
Postel, "Internet standard subnetting procedure," IETF, pp.
Solving subnetting problems requires an in-depth understanding of IP addressing mechanisms.
To investigate the solving of subnetting problems, we considered two distinct streams of literature: 1) Kolb's Experiential Learning Cycle (Kolb, 1976; Cook and Swain, 1993; Cornwell and Manfredo, 1994; de Ciantis and Kirton, 1996) with the abstract/concrete distinction (Reeves and Weisberg, 1993a; Reeves and Weisberg, 1993b), and 2) problem solving in general (Newell and Simon, 1972) with emphasis on Huber's approach to problem solving (Huber, 1980).
Our domain of interest was network subnetting, an instance of technical problem solving.
We hypothesize that a technical subject, such as subnetting, is a good test of Kolb's cycle, and that Kolb's cycle could help us to design better support for the solving of both concrete and abstract problems.
Will problem solvers perform better on the abstract or on the concrete version of the same subnetting problem?
There are a couple of important issues to consider when doing subnetting of Class C networks.
The first thing to be aware of when subnetting Class C networks is that when you subnet, subnets and hosts numbered "0" and "-1" (i.e., all zero or one bits in the subnet or host fields in the IP address) are reserved for special purposes in IP (broadcast and "this host/subnet" indication), and cannot be assigned to physical networks or hosts (which use that subnet mask--more on this later).
If we continue using a nonmask-based routing protocol, however, we could cure this problem by not subnetting, and instead give C and E each their own Class C network number.
By deploying a mask-based routing protocol such as OSPF, you may reduce the needed address space to 7 Class C networks (by subnetting for E and C again, as described earlier), and drive the address space utilization up to 53%.
For some organizations this proved inadequate and wasted a lot of addresses for those owning Class B network numbers.' Thus, the idea of subdividing the address space at a lower level emerged, and this is done via so-called subnetting [15].