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Abstract

The present invention involves a method for multicast file distribution and synchronization in data networks. Specifically, the present invention includes a mechanism for efficient and reliable distribution of a data file from a single source to a large number of receivers using multicast distribution in wide area networks. The multicast file distribution is done by designating a receiver as an active receiver. The active receiver is selected using a novel token granting procedure. Once selected, the active receiver is responsible for generating retransmission requests as well as providing flow control feedback to the server during data transfer. All receivers on the network are offered a chance to become an active receiver in a controlled manner, and only one receiver can be an active receiver at any given time. This process continues until there are no receivers in the group with missing data segments. The second part of the protocol provides synchronization of the file version to ensure that all receivers have the last distributed version of the data file. In addition, the protocol allows newly joined receivers to request the file from the server. The protocol is suitable for applications where a server periodically distributes a new version of the data file to receivers in the network. In addition, the protocol can be deployed with or without the support of Internet Protocol (IP) multicast technology, and is not tied to any particular network topology or transmission medium./C

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First Claim