overlay network

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overlay network

A logical network that runs on top of another network. For example, peer-to-peer networks are overlay networks on the Internet. They use their own addressing system to determine how files are distributed and accessed, thus providing a layer on top of the Internet's IP addressing.

A quality of service (QoS) system is also called an overlay network, because it uses an additional addressing mechanism that may change the route normally taken in the underlying network. See also over-the-top broadcasting and over-the-top messaging.
References in periodicals archive ?
Our solution is fundamentally based on dynamic task distribution tree constructed on demand under an existing P2P overlay network.
In fact, the solution does not suffer from the scalability problem, but it depends on the scalability of the underlying P2P overlay network on which is implemented (It is more scalable on Chord architecture than on Gnutella, because Chord is more scalable than Gnutella).
Web search over P2P overlay networks has the potential to become an alternative to current Web search engines due to its decentralized nature and favorable scalability properties.
Peers choose independently the indexing features and related posting lists for their local document collection and, for this task, combine their local knowledge and the global knowledge maintained by the P2P overlay.
In the next step it chooses a set of postings associated with each key according to the global resource constraints it is aware of, and subsequently inserts the (key, posting list) pairs into the P2P overlay.
Firstly, a peer can insert all postings for locally rare keys, and the P2P overlay then decides globally about the set of postings that get stored.
mapping of a query to keys and subsequent retrieval of postings from the P2P overlay, and
Recent approaches combine global knowledge with local indexes: For example, PlanetP [7] gossips compressed information about peers' collections in an unstructured P2P network, while MINERVA [3] maintains a global index with peer collection statistics in a structured P2P overlay to facilitate the peer selection process, and implements a method which penalizes peers holding overlapping document collections.
We have presented a P2P framework for information retrieval that uses a novel retrieval model based on global indexing of rare keys in structured P2P overlay networks.
Web search over peer-to-peer (P2P) networks shows promise to become an alternative to the state-of-the-art search engines since P2P overlays offer means for decentralized search across widely-distributed document collections.
His topics include server clusters and network load balancing, resource management with QoS in mind, server capacity planning, Web caching and pre-fetching, the P2P overlay network, mobile code and security, and mobility support for adaptive grid computing.
Topics of the 79 papers include a federated directory system of semantic web services, rarity-based routing in structured P2P overlays, virtual storage services for dynamic collaboration, structural adaptation of workflows, and a dual driver networked fire truck simulator.