網路封包












数据包（英语：Data packet），又称分组，是在分组交换网络中传输的格式化數據單位。


一個数据包（packet）分成兩個部份，包括控制信息，也就是头（header），和資料本身，也就是负载（payload）。


我们可以将一个数据包比作一封信，头相当于信封，而数据包的数据部分则相当于信的内容。当然，有时候一个大数据包可以分成多个小数据包，这个和信不同。



OSI模型


在OSI模型中，数据包是对第三層的数据單位的称呼。



参见



  • 嗅探

  • 分组交换








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