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Packet loss occurs when one or more packets of data travelling across a computer network fail to reach their destination. Packet loss is typically caused by network congestion. Packet loss is measured as a percentage of packets lost with respect to packets sent. The Transmission Control Protocol (TCP) detects packet loss and performs retransmissions to ensure reliable messaging. Packet loss in a TCP connection is also used to avoid congestion and reduces throughput of the connection. In streaming media and online game applications, packet loss can affect the user experience. == Causes == Packet loss is typically caused by network congestion. When content arrives for a sustained period at a given router or network segment at a rate greater than it is possible to send through, then there is no other option than to drop packets.〔Kurose, J. F. & Ross, K. W. (2010). Computer Networking: A Top-Down Approach. New York: Addison-Wesley. P 30.〕 If a single router or link is constraining the capacity of the complete travel path or of network travel in general, it is known as a bottleneck. Packet loss can be caused by a number of other factors that can corrupt or lose packets in transit, such as radio signals that are too weak due to distance or multi-path fading (in radio transmission), faulty networking hardware, or faulty network drivers. Packets are also intentionally dropped by normal routing routines (such as Dynamic Source Routing in ad hoc networks, 〔Perkins, C. E. (2001). Ad Hoc Networking. Boston: Addison-Wesley. P 147.〕) and through network dissuasion technique for operational management purposes.〔"(Controlling Applications by Managing Network Characteristics )" Vahab Pournaghshband, Leonard Kleinrock, Peter Reiher, and Alexander Afanasyev ICC 2012〕 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「Packet loss」の詳細全文を読む スポンサード リンク
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