Architectural Models
The three architectural models for p2p considered here are
Atomistic
User-centric
Data-centric
The last two are similar in that they usually rely on centralized servers to mediate connectivity based on directories of users or resources and data.
Each model is examined to show its main and distinctive characteristics.
Atomistic P2P
In the atomistic model ( AP2P), all nodes are equally server and client. There is no central administration or connection arbiter, although such might be implemented as distributed services within the network. For purists, this model is the original and only “true” p2p architecture.
Each node in the atomistic model is autonomous and fully manages its own resources and connectivity. Figure 2.2 shows ...
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