Computers talk to each other all the time. They use special computers to help them talk. Those special computers watch the computer-talk and can send us a message to show us the computer-talk. These messages don’t tell us what the computers are saying to each other, but they do tell us which computers are talking, how much they’re talking, how often, when they talk, and the way they talk to each other. We can use all these messages about the computer-talk to show what we need to make sure our computers can talk to each other without problems. We can tell when some computers are talking too much, or too often. We can also tell if we have big enough paths between our computers, and if those are working well.