"A stock is the foundation of any system. Stocks are the elements of the system that you can see, feel, count, or measure at any given time. A system stock is just what it sounds like: a store, a quantity, an accumulation of material or information that has built up over time....Stocks change over time through the actions of a flow. Flows are filling and draining, births and deaths, purchases and sales, growth and decay, deposits and withdrawals, successes and failures. A stock, then, is the present memory of the history of changing flows within the system."
Meadows, Donella H. 2008. Thinking in Systems: A Primer. pp. 17-18.
The IT Lab LAN (local area network) is composed of a number of physical and virtual devices, for which it20 is the primary server. Moreover, the virtual machines will also function as both servers and clients to one another. How is the IT Lab LAN a system, and what are the stocks and flows that characterize its state and behavior over time?
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