摘要或動機

中文摘要：\r
本研究旨在探討，在TCP/IP 協定之下，最大網路傳輸效率之MTU\r
（Maximum Transmission Unit,最大傳輸單位）值。根據IEEE 所公\r
佈Ethernet 之標準，經實地模擬實驗，本研究之結論如下：（1）在\r
單純兩台電腦直接串接時，由於幾乎無任何干擾與封包的碰撞，可設\r
定之MTU 最大值以1500bytes 為最佳；（2）但在模擬真實的大型廣域\r
網路時，由於碰撞增加及雜訊增多，經模擬實驗顯示，MTU 值為\r
1500bytes 時無法在資料傳送、接收及重組時取得平衡，最佳之MTU\r
值落於500 到600bytes 之間，進一步研究顯示MTU 值設在500 到\r
600bytes 時可提升傳輸效率約50%。同時，本研究亦討論將此機制應\r
用於未來新網路標準之可行性及其必要性。Abstract：\r
The main purpose of this research is to explore the best network\r
transmission efficiency's Maximum Transmission Unit under TCP/IP\r
protocol. According to the Ethernet's standard of IEEE and simulated\r
experiments, the outcome of this research are :( 1) When connecting two\r
computers serially, there is almost no interference and impact of packets,\r
the best MTU that we can set up is 1500bytes ;( 2)When simulating the\r
truly wide area network, interference and impact are rising. The result of\r
this simulates experiment shows that when MTU is at 1500bytes, it's\r
unable to keep balance when sending, receiving and re-composing. The\r
best new MTU is between 500bytes and 600bytes. And when MTU is\r
between 500bytes and 600bytes, the network transmission efficiency can\r
be promoted about 50% higher. At the same time, the research is also\r
discussing the feasibility and necessity of applying it to the standard of\r
the future network.