Abstract
TCP and UDP are two important protocols in the network transport layer. In this paper, we study the effects of TCP and UDP on the performance of the application. Based on OPNET simulation software, a simple FTP application simulation model was created and the experiment was carried out. In order to test the influences of different transport protocols on the performance of application in different environments, different scenarios are designed in the experiment. Based on the simulation results of different scenarios, the impacts of different transport protocols on application performance are analyzed.