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21 February, 20:58

When the Squirrel peer-to-peer web caching service was evaluated by simulation, 4.11 hops were required on average to route a request for a cache entry when simulating the Redmond traffic, whereas only 1.8 were required for the Cambridge traffic. Explain this and show that it supports the theoretical performance claimed for Pastry.

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  1. 22 February, 00:55
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    Answer:An external caching scheme stores copies of web objects

    or meta-data so that clients can avoid requests to a web

    server. The best known example of an external cache is a

    web proxy, but with the rapid spread of web technologies,

    many other caching scenarios can be identified. Caching

    is central to performance in the web, both because it re-

    duces load on servers, and because cached data is normally

    cheaper to access from another machine that is closer in the

    network. Although cooperation between cache managers is

    not a common feature of existing web architectures, coop-

    erative caching supported by peer-to-peer architectures has

    great potential [9, 13]. When sets of client systems have sim-

    ilar interests and fast low-latency interconnections, shared

    caching could bring significant benefits.

    The peer-to-peer mechanisms referred to
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