Hi @hshifi So, all internet traffic happens using TCP/IP. This protocol has source and destination IP addresses. The only traffic coming to your router is traffic specifically sent to you.
Some of this traffic is of course malicious and intended to look for vulnerable services. The router behind the modem is responsible for blocking all incoming traffic that is unsolicited/unwanted.
Having said this, I have seen coaxial cables cause ground loops. Having a cable isolator fixes these.
does the buffering take care of the interruptions like matching the clocks? Yes. Ideally, you have more data than is asked for. Say 1 seconds worth. While the input/output must be balanced, on average, it does not have to be exactly right all the time. So, the DAC may continue to feed off the buffer even if the incoming data is randomly delayed by 0.01 or more seconds.
Oh, lastly, Ethernet uses balanced, ground isolated connections by design. Ground loop issues are a real problem in offices and labs, given the long runs possible so the whole Ethernet chain is designed with this in mind.
However, routers and switches usually have noisy power supplies which can contaminate your AC line.
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