Sooner or later we all will need to use some type of network monitoring software and hardware. I will be discussing some Network Monitoring Basics. There are hundreds of tools available to monitor your network. It all depends on what your goals are.
You have network monitoring platforms, like aggregate network manager, castle rock and David system to name a few, these type of systems allow you to integrate all of your systems, ie; intranet, Internet, HAVOC, lighting, etc. Some of the commercial network monitoring solutions include, analyzers and sniffers, application services and systems monitors, emulators, flow monitoring, FTP, IPAM, IT search, network security tools, SNMP tools, topology and traceroute, and VOIP."Network Monitoring Basics"