IPv4 首部的最小长度为（ ）字节；首部中 IP 分组标识符字段的作用是（请作答此空）。
- A.标识不同的上层协议
- B.通过按字节计算来进行差错控制
- C.控制数据包在网络中的旅行时间
- D.分段后数据包的重装
正确答案及解析
正确答案
解析
对于大的数据，IP包必须分片，为了是分片后的数据重装，必须使用使用IP标识。
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