另外，它还有对数据包进 行分段和重组(Fragmentation and Reassembly)的能力。IP 是一个无连接、不可靠的传输协议，无连接意味着在交 换数据之前没有确定一个对话，不可靠则意味着传送不 能被保证。
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This process is referred to as fragmentation and reassembly.
这一过程又称为数据包的分块和再组装。
Large messages, up to the buffer capacity of the sending and receiving devices, are supported using Fragmentation and Reassembly.
应用分割和重组可支持大量消息(大到发送设备和接收设备的缓冲区容量)的收发。
Fragmentation and reassembly are a costly affair and, though this is performed only by intermediate routers, it has severe impact on throughput.
分片和重组的代价非常高，并且尽管仅由中间路由器执行这项任务，但是它对吞吐量有很大的影响。
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