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可靠性 - Wikipedia

可靠性

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计算机网络中,可靠协议 保证可靠属性 with respect to the delivery of data to the intended recipient(s), 与不可靠协议相反,不可靠协议不保证数据被无损传输,甚至传输与否.

可靠多播协议 会保证reliability on a per-recipient basis, 也提供高可靠属性 that relate the delivery of data to different recipients, 如总序号, 原子性, 或虚同步.

可靠协议一般导致比不可靠协议更高的开销,从而更慢,更less scalable. 这对于单播协议不是问题, but it may be a problem for multicast protocols.

TCP是现在的Internet上的主要协议,是一种可靠单播协议。UDP协议是一种不可靠协议,经常在计算机游戏或其他speed is an issue and the loss of a little data is not的场合。

可靠多播协议的例子包括Reliable Multicast Transport Protocol (RMTP), Scalable Reliable Multicast (SRM), QuickSilver Scalable Multicast (QSM) and SMART Multicast (SMART) (Secure Multicast for Advanced Repeating of Television).

可靠单播协议经常也是面向链接的. 例如,TCP/IP 协议是面向链接的,虚链路标识构成了IP地址的源地址、目标地址和端口号码。许多不可靠协议也是面向链接的,包括ATM帧中继, on which a substantial part of all Internet traffic is passed.


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