Is Network Monitor a threat to security?
As you can see, Network Monitor can be used to determine just how secure or insecure your data really is. However, as you can imagine, in the wrong hands, Network Monitor itself can be a threat to security. Fortunately, Microsoft realizes this and built precautions into the software. To test to see if someone else is running Network Monitor, simply close the current window, which should still be displaying captured data. Next, select Tools|Identify Network Monitor Users command from the Tools menu. When you do, you’ll see a list of users running Network Monitor. Keep in mind, though, that the limited version is only capable of spotting users on PCs that have direct communications with the computer on which you’re running Network Monitor–if the other machine is across a switch or router, then you won’t be able to see it.