Mostly not. But she wrote that she has no idea about how the internet (or probably communications in general) works: Communications channels can be described by

Mostly not. But she wrote that she has no idea about how the internet (or probably communications in general) works: Communications channels can be described by certain channel capacity as well as a signal to noise ratio (SNR). The lower the SNR the higher the chance of losing information (packets or parts of them). Encoding and error correction can help to a certain extent, but will lower the throughput. Whatever you do, Theres always a chance > 0℅ to lose something. On wireless connections much higher. If internet on your mobile doesnt work properly it's much more because of this and not because of overloaded buffers. The extreme case would be a cut cable, which leads to a SNR of 0. Depending on the medium and topology other errors can Happen, e.g. routing errors. Im surprised that nothing like this is mentioned, isnt that undergraduate university stuff?