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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Connection-oriented communication ： ウィキペディア英語版 Connection-oriented communication Connection-oriented (CO-mode〔Information Processing Systems - Open Systems Interconnection, "Transport Service Definition", International Organization for Standardization, International Standard 8072, June 1986.〕) communication is a network communication mode in telecommunications and computer networking, where a communication session or a semi-permanent connection is established before any useful data can be transferred, and where a stream of data is delivered in the same order as it was sent. The alternative to connection-oriented transmission is connectionless communication, for example the datagram mode communication used by the IP and UDP protocols, where data may be delivered out of order, since different packets are routed independently, and may be delivered over different paths. Connection-oriented communication may be a circuit switched connection, or a packet-mode virtual circuit connection. In the latter case, it may use either a transport layer virtual circuit protocol such as the TCP protocol, allowing data to be delivered in order although the lower layer switching is connectionless, or it may be a data link layer or network layer switching mode, where all data packets belonging to the same traffic stream are delivered over the same path, and traffic flows are identified by some ''connection identifier'' rather than by complete routing information, allowing fast hardware based switching. Connection-oriented protocol services are often but not always ''reliable'' network services, that provide acknowledgment after successful delivery, and automatic repeat request functions in case of missing data or detected bit-errors. ATM, Frame Relay and MPLS are examples of a connection-oriented, unreliable protocol. ==Circuit switching== Circuit switched communication, for example the public switched telephone network, ISDN, SONET/SDH and optical mesh networks, are intrinsically connection-oriented communications systems. Circuit mode communication provides guarantees that data will arrive with constant bandwidth and at constant delay and in-order delivery of a bit stream or byte stream is provided. The switches are reconfigured during a circuit establishment phase. 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「Connection-oriented communication」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.