IP数据报经过MTU较小的网络时需要分片。假设一个大小为3000的报文经过MTU为1500的网络，需要分片为（ ）个较小报文，最后一个报文的大小至少为（ ）字节。
问题1选项
A.2
B.3
C.4
D.5
问题2选项
A.20
B.40
C.100
D.1500
正确答案及解析
正确答案
解析
答案： B、B
当一个IP数据报封装成链路层的帧时，此数据报的总长度一定不能超过下面的数据链路层的MTU值。当数据报长度超过网络所容许的最大传送单元MTU时，就必须把过长的数据报进行分片后才能在网络上传送。新版章节练习，考前压卷，完整优质题库+考生笔记分享，实时更新，软件， ，现在一个IP包（20+2980）字节，现在MTU是1500，那么至少分2片，第一片（20+1480），第二片（20+1480），第三片（20+20）。
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