模拟实现网桥的转发功能，以从文件中读取帧模拟网桥从网络中收到一帧，即从两个文件中读入一系列帧，从第一个文件中读入一帧然后从第二个文件中再读入一帧，如此下去。对每一帧，显示网桥是否会转发。-Analog forwarding bridge received from the network in a frame simulation bridge to read from the file and read into a series of frames from the two files into one and then read from the first file fromread into a second file, and so on. For each frame, the bridge forwarded.