IPv4首部的最大值为（）字节，原因是IHL字段长度为（作答此空）比特。
- A.2
- B.4
- C.6
- D.8
正确答案及解析
正确答案
解析
参见《网络规划设计师5天修炼》IP协议部分。头部长度（Internet?Header?Length，IHL）。该字段长度为4位。表示数的单位是32位，即4字节。常用的值是5，也是可取的最小值，表示报头为20字节；可取的最大值是15（二进制为1111），表示报头为60字节。
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