Pick a topology, aim a packet at a server, and watch it walk hop by hop — DNS, ARP, switching, routing, NAT, the firewall, the destination. Then predict where packets die in quiz mode.
Set your port and hit Send packet. The story of the packet appears here, one hop at a time.
A packet gets sent. Something in the path stops it — or does it? Read the scenario, pick where you think the packet's journey ends, then check yourself.