Update protocol-testing.md

Author: pagio

docs/protocol-testing.md

@@ -20,6 +20,7 @@ behavior, it is a red flag.
 
 - Are smaller-sized, more frequent IBs better or worse than larger-sized, less
   frequent IBs?
+- How does IB generation frequency relate to IB network dissemination time? How does this time relate to the time described in the network functionality in the Leios paper? What is the induced network capacity ?
 
 ## Test Cases