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PEER-TO-PEER NET
WORKING
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INTRODUCTION
Peer-to-peer networks are appropriate only for verysmall business or for house use.A peer-to-peer network can support about ten clients(workstations) before it begins to suffer from some serious perform
ance and managemaent problems.Usually peer-to-peer networks are composed of clients that run either Windows NT workstations or Windows 98.
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OVERVIEW
Peers act as both client and server
Centralized/decentralized models
Issues: volatility, scalability, legality
Network built and sustained by resources of each participant
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WHAT IS P2P SYSTEM
Multiple sites (at edge)
Distributed resources
Sites are autonomous (different owners)
Sites are both clients and servers ("servent")
Sites have equal functionality
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CLASSIFICATION TO P2P
Unstructured P2P systems
Napster (Centralized)
Gnutella (Distributed)
Kazaa/Fasttrack (Super-node)
Structured P2P systems (DHTs):
Chord
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NAPSTER
Was used primarily for file sharing
Not a pure P2P network=> hybrid system
Ways of action:
Client sends server the query, server ask everyone and responds to client.
Client gets list of clients from server.
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GNUTELLA
>Pure peer-to-peer.
>Very simple protocol.
>Hit rates are high.
>High fault tolerance.>Adopts well and dynamically to changing peer p
opulations.
>High network traffic.
>No estimates on duration of queries.>No probability for successful queries.
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DHT DESIRABLE PROPERTIES
Keys mapped evenly to all nodes in the network
Each node maintains information about only a fewother nodes
Messages can be routed to a node efficiently
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PEER-TO-PEER NETWORK PROPERTIES
>Proportion of total internet traffic;growth patterns.
>Protocol split;content trends.
>Location of entities;grouping/performance.
>Access of methods;search efficiency.
>Response latency;performance.
>Leeching;network health.
>Node availability;performance.
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P2P BENEFITS
Efficient use of resourcesScalability:Reliability:Ease of administration:
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DISADVANTAGES
> In this network, the whole system is decentralized thus it is difficult to administer. That is one person cannot determine the whole accessibility setting ofwhole network.
>Security in this system is very less viruses, spywar es,trojans, etc malwares can easily transmitted over this P-2-P architecture.
> Data recovery or backup is very difficult. Each computer should have its own back-up system
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THANK YOU
