Problem with edges

[IIAlexII]

Hi guys,
I apologize in advance for the question, probably is very silly or maybe not. I try to create my own topologies to make a simulation and see some results but:

1. I think it's not possible to create both directional edges between two nodes. It's true? (for example one edge from node A to node B and another one from node B to node A independently from the layer in which the nodes are)
2. it's not possible to create ONE edge between nodes of the same level. it's true? (if I create two fog nodes of level 1 and i want to connect them with an edge)
3. if I draw my topology and i want to test it to have back results (like the ones in the results folder), how i can do it?
   Can someone help me to take these doubts off? Thank you in advance.