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Anycast is a network addressing and routing methodology in which datagrams from a single sender are routed to the topologically nearest node in a group of potential receivers, though it may be sent to several nodes, all identified by the same destination address. ==Addressing methods== The Internet Protocol and other network addressing systems recognize five main addressing methodologies: *Unicast addressing uses a ''one-to-one'' association between destination address and network endpoint: each destination address uniquely identifies a single receiver endpoint. *Multicast addressing uses a ''one-to-unique many'' association, datagrams are routed from a single sender to multiple selected endpoints simultaneously in a single transmission. *Broadcast addressing uses a ''one-to-many'' association, datagrams are routed from a single sender to multiple endpoints simultaneously in a single transmission. The network automatically replicates datagrams as needed for all network segments (links) that contain an eligible receiver. *Anycast addressing routes datagrams to a single member of a group of potential receivers that are all identified by the same destination address. This is a ''one-to-nearest'' association. *Geocast refers to the delivery of information to a group of destinations in a network identified by their geographical locations. It is a specialized form of Multicast addressing used by some routing protocols for mobile ad hoc networks. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「anycast」の詳細全文を読む スポンサード リンク
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