标签：htm 放弃 分组交换 stream tran live 之间 重复 ack
在网络层，互联网提供所有应用程序都要使用的两种类型的服务，尽管目前理解这些服务的细节并不重要，但在所有TCP/IP概述中，都不能忽略他们:
无连接分组交付服务(Connectionless Packet Delivery Service)
无连接交付抽象地表示大多数分组交换网络都能提供的一种服务。简单地讲，指的是TCP/IP灰暗网按照报文上携带的地址信息把短报文从一台机器传递到另一台机制。因为无连接服务单独传递每个分组，所以不能保证可靠、有序地传递。而且，由于无连接服务通常直接映射到底层的硬件上，所以非常有效。更重要的是，有了无连接分组交换作为互联网服务的基础，使得TCP/IP协议协议可以适应多种网络硬件。
可靠的数据流传输服务(Reliable Stream Transport Service)
大多数应用程序要求得到比分组交换更多的服务，因为它们要求通信软件能够从传输错误、分组丢失或发送者与接受着之间路径上的交换机的故障中自动恢复过来。可靠的传输服务处理了这些问题。它允许一台计算机上的应用程序与另一台计算机上的应用程序之间建立一个"连接"，然后通过该链接发送大量数据，就像这是一个永久的直接硬件连接。当然，在底层，通信协议把数据流分成一个个小报文来发送它们，一次一个，同时等待接受这发送确认接收的信息。
无连接交付系统
最基本的互联网服务由一个分组交付系统组成。从技术角度来讲，该服务被定义为不可靠的、尽最大努力交付的、无连接分组交付系统，类似于由运行在尽最大努力交付模式的网络硬件所提供的服务。这种服务是不可靠的(unreliable),因为不能保证交付。分组可能丢失、重复、延迟或不按序交付等，但服务不检测这种情况，也不提醒发送方和接收方。服务是无连接的(connectionless),因为每一个分组都被独立对待。从一台计算机发送到另一台上的分组序列，可能经过不同的传输路径，或者有的丢失有的到达。最后，服务会尽最大努力交付(best-effort delivery),因为互联网软件尽力发送每个分组。也就说，互联网并不随意地放弃分组，只有当资源用完或底层网络出现故障时才可能出现不可靠性。
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原文地址：http://www.cnblogs.com/CyanApple/p/7140482.html
