I would like to test network throughout across my LAN and across my WAN. I would like to verify the speed/bandwidth from a PC through a switch to a server or from a PC through a switch, through a router, across the WAN, through a router at the destination, through a switch at the destination, then to a server at the destination. If I don’t get what I think I should get either Fast E or Gig E or T1 or whatever speed, what is a good tool to troubleshoot computers, network cards, switch speeds, etc.