I love this type of game and had a lot of fun figuring it out, even if the UI made it a bit difficult.
There needs to be more feedback as to what the UI is doing, like highlighting what you have selected, what you can and can't connect, perhaps click and dragging wires and visually laying them out as you do that. There is also no way to restart the simulation if you make a mistake.
I didn't realize colored packets can go to either server, and I didn't have to connect 2 servers of the same color to the same switch. I solved a level with 400 lost packets before I figured that out.
You did have some nice UI features though, I appreciate the routing table on the switches.
This game needs some UI improvements and some clarity in explaining the mechanics and it would be truly great!