Hi guys, I want to make sure that our network is as secure as possible. What is the best newbie tool(s) to run and where is the best tutorial on running the said tool in order to see what is going on.
We have an NT4(All patches up to date) server to which are connected 40 odd nodes and the server is connected to the net via a router which is also a firewall (Netgear FVS 318).
I want two tools I guess. Something that will highlight vulnerabilities at the perimeter and also soemthing that can track traffic inside the boundaries.

If anyone knows a good book to start me off that I can get my teeth into that would be cool too.
Cheers guys.