As USAFRet says, ALL .... That means the entire wired network cabling system in your house. Then, of course, to get anything else you are trying to use to communicate with your computer at that rate, the OTHER device you are trying to use (say, a RAID storage server, or another computer) also must be capable of that speed. And very importantly, you MAY be expecting to achieve that speed when you are using the internet. That means your internet service from your provider must also be capable of that speed, and you'll have to pay a significant premium price for that. Many service providers do not even have that capability. And finally, you also are limited by the speed of the website you are communicating with. We have a 1 Gb/s connection by fibre optic cable to our house, and we do get that speed in best conditions. But I know that many file downloads proceed much more slowly because the SENDER at the other end cannot match that speed. If I'm downloading many files simultaneously, the download speeds of the several files can be quite different, even though the total data transfer rate for the whole bunch is high.