I have read that you need to know security tools if you are going to break into the IT/ Network Security field. I have found this website http://sectools.org/. The site ranks and updates the top 100 network security tools. This site seems like a great place to see what tools are on the rise and which are falling out of popularity.
After reviewing the list I noticed that I used several of the tools. Most of the tools tend to be either free or open source. It is not realistic for me to learn and master all 100 tools. I plan to move down the list one at a time starting at 1 and go to 25. This will allow me to master the popular tools and keep up with changes in the industry.