We all know it can be difficult to find a needle in a haystack, but in this puzzle you have to
#Find the NEEDLE in the network!
A bit more detailed:
Somewhere in the network pictured above hides the word Needle encoded in a rather well known cipher. (You will find examples of the used cipher on Puzzling SE in several other puzzles.) The task is to find it (and the used cipher).
The image alone constitutes the puzzle.
It is visual and no information is hidden in its digital representation.
(If you want, you can draw the same image by hand.)
The solution requires a cipher to be applied, i.e. the word "needle" is encoded not just visually hidden or obscured.