Good questions to a very touchy subject;
As network and telecom manager for a very large government agency, I have had to ?discus? the finer nuances of monitoring usage and justify the need. There is a gamut of reasons why you need to monitor andin my opinion, not block users inappropriate use of your company?s automation resources. A few reasons are the waist of time not to mention bandwidth. I have found that users spend approximately 40% of their time on the Internet for personal use. Inthe relationship of cost versus quality of service, this is a big problem. If one user is using the Internet to do bonafide work, that lets say would take one hour to complete. Then you have another user surfing porn during that same time. It hinders the user that is trying to his or her work. That equates to man-hours, which costs money. Granted, if you have few users, it won?t facilitate itself. For me it?s an amazing problem.
Why not block? Well no software can keep up with the many siteswe would rather not have our users go to. So we monitor. I would rather not have the users ?know? which sites the software knows about. I would rather have them guess.
We use logon banners, stipulating the inappropriate use and it?s penalties, we have users sign for a logon account with the same jargon, and we have a posted memorandum stating what is considered inappropriate or not.
Finally, any time your users go to any site on the Internet, your network is at a certain degree of exposure. This of course depends on the protective measures you have in place. But the point is, that there are many sites (i.e. porn, gambling, etc) that propagate hacking or selling e-mail lists. It is just the best practice for you users not to use your network for their personal habits. By the way, why wouldn?t your boss want you to know what information is on you system? If it were me, I would check him / her first.