as i know, every ip packet changed at layer 2 to frame, that means all frame or bit flowing at the network or should said at the physical line, not ip, when the ip (actuall, it had changed to frame)met the bridge or switch which going to check their table for deciding if it is at inside the network segment or outside the network, if outside, they will flooding. then they arrived the destination, they changed the bit to frame, then change the frame to ip, my english is not good, but hope can express clear, the question is that all ip has been changed at layer 2 to frame, no one care this frame is ip or tcp!!!!
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