以太网的最大帧长为1518字节，每个数据帧前面有8个字节的前导字段，帧间隙为9.6us。若采用TCP/IP网络传输14600字节的应用层数据，采用100BASE-TX网络，需要的最短时间为（ ）。
- A.1.32ms
- B.13.2ms
- C.2.63ms
- D.26.3ms
正确答案及解析
正确答案
解析
以太帧的最大帧长1518字节，其中IP数据报为1500字节，TCP报文为1480字节，TCP的数据就是1460字节，每个数据帧前面还有8字节的前导字段，帧间隔9.6us。现在传送14600字节的应用层数据，需要分成14600/1460=10个帧传送。
现在一帧的传送时间=（1518+8）×8/100*106=0.00012208秒，10帧的话为1.2208ms，再加上帧间9.6us×10=96us，那么总时间等于1.2208ms+0.096ms=1.32ms。
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