17. معماری های نظیربه نظیر غیر ساخت یافته
UNSTRUCTURED PEER-TO-PEER ARCHITECTURES
First, let us assume that when a node wants to join it
contacts an arbitrary other node, possibly from a list of
well-known access points.
This access point is just a regular member of the overlay,
except that we can assume it to be highly available.
In this case, it turns out that protocols that use only push
mode or only pull mode can fairly easily lead to
disconnected overlays.
In other words, groups of nodes will become isolated and
will never be able to reach every other node in the
network.
Clearly, this is an undesirable feature, for which reason it
makes more sense to let nodes actually exchange entries.
M.H.E
17