There are many ways to hook up cables and computers. Bus, ring, mesh, and star topologies all have availability and integrity concerns. (Again, we are putting confidentiality aside for the moment. We will come back to it higher in the networking stack.) The best for availability is mesh, though its cost and complexity usually relegate it to the switch backbone and Wan links. Lans are usually physically a star and logically switched.
Peer-to-peer networks take less time and money to setup. Yet they are inherently insecure. The company’s information is in the hands of people who are very good at doing their job, yet likely not very good at doing the job of a systems administrator. Central control and formal policy is better, which is what domains are intended for.
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