As triggered by many private questions and Moodle questions from students, the following clarification is made regarding the rumor mongering.
When selecting a node for rumor mongering, a node should not select the node from which it received this rumor message; i.e. the peer should not rumor-monger a message back to the peer that has just sent it the message.
Hope this solves some confusions some of you had regarding rumor mongering.
Please feel free to raise additional questions if this is not clear
(Edited by Kirill Nikitin - original submission Tuesday, 20 October 2020, 13:38)