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----list the typical operations performed for joining and leaving a tree based p2p streaming app
*tree based :
After a bootstrap phase (where the initial node downloads from a web page a list of active peers) he contact someone. A join msg is sent htrough the mesh overlay to all peers (in this way everyone knows that a new peer wants to join). The same happens frothe leaving step : a leave msg is propagated trhough the mesh topology.

*multitree based:
peer join:
a node that wants to join to the net has to :
find his current position in m trees
join as an internal child in one tree , the parent will be the first node with the lowest depth that can accept a further child.
the highest is the position the more the peer will contribute in the distribution

Peer leaving: The leaving of a peer , if he is placed as a leaf , does not cause problems while if he is an interior his children has to reperform the join operation




----describe the concept of end system mlticasting EMS

this system has two overlays
the first is in charge of the tree mainteinance and its based on a mesh topology
the second is in charge of distribute an find contents its based on a tree topolgy

the approach is distributed , but peers actually maintain a global view of the network.

     
 
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