By node in this post we understand internet device, network of such form a graph.
Communication from node A to node B can go through other transitory node T.
Then we can reach node B with message with 100% success rate if node T won't fail, at time tT = 1 unit.
If we have three transitory nodes T1, T2 and T3 then we can send messages via them in many ways.
1. Via random or predetermined node.
If that node fails, signal needs to be retransmitted.
2. Via all nodes at once, whole message.
It succeeds as long as at least one transitory node does not fail, but signal can be captured easier.
3. Via all nodes, 1/3 of message through each.
Transmission fails if at least 1 node fails. But rest of message can be resent later. There's less risk of capturing whole signal by opposing forces. If it's encrypted, it's hard to decipher that way. It's faster transmission as well.
4. Via all nodes, 2/3 of message through each. (different 2/3 via each).
Transmission succeeds 100% of time when at least two nodes won't fail. Whole signal is captured if 2 transitory nodes are captured. When one node won't fail, 2/3 of signal are sent, then rest can be transmitted again.