Depends on if any Cisco Gear is invloved really. No good if running a legacy system, but may be of use on a Cisco network,. However, depends on size of biz as well.
In a large corp, you will have Voice techs and Data techs. Although it may help to understand what they are on about, chances are they (data) won't let you touch the network. In a smaller comany, you may have the jack-of-all-trades where it may be of more use.
So in short, depends on what you will be working on....
Only the truly stupid believe they know everything.
Stu.. 2004