Distinguishing Views in Symmetric Networks: A Tight Lower Bound
  The view of a node in a port-labeled network is an infinite tree encoding all walks in the network originating from this node. We prove that for any integers $n\geq D\geq 1$, there exists a port-labeled network with at most $n$ nodes and diameter at most $D$ which contains a pair of nodes whose (infinite) views are different, but whose views truncated to depth $\Omega(D\log (n/D))$ are identical. 
Dariusz Dereniowski, Adrian Kosowski (INRIA Paris-Rocquencourt,   LIAFA), Dominik Pajak
cs.DM cs.DS