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revision 1.163 by hemppah, Thu Mar 20 11:51:01 2003 UTC revision 1.164 by hemppah, Thu Mar 20 12:18:43 2003 UTC
# Line 167  have applied similar techniques when con Line 167  have applied similar techniques when con
167  overlay network.  overlay network.
168    
169  In the end, however, we observe that there are only two approaches in which all modern Peer-to-Peer  In the end, however, we observe that there are only two approaches in which all modern Peer-to-Peer
170  systems fall: the loosely structured approach and the tightly structured approach. In the loosely  systems fall: the loosely structured approach and the tightly structured approach. By structure, we refer to
171  structured approach the construction and the maintenance of the overlay is controlled  the topology of the overlay network, i.e., how the connections between participating peers are created
172  loosely. This approach gives freedom for participating peers  and maintained. In the loosely structured approach the construction and the maintenance of the overlay is controlled
173  to perform certain tasks in a Peer-to-Peer network. On the other hand in the tightly structured  loosely. The placement of services and topology of the overlay is random. Data lookups in loosely structured systems are
174  approach, the overlay is constructed determistically, which all participating peers have to follow.  not very efficient, because of unstructured properties of the overlay. On the other hand, in the tightly structured
175    approach the overlay is constructed determistically, which all participating peers have to follow. The topology of the
176    overlay and the placement of services is controlled tightly therefore enabling more scalable and efficient data lookups.
177    
178    In the following sections, we will discuss in more detail the properties of these approaches.
179    
180    
181  \section{Centralized}  \section{Centralized}

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