The Prime Minister of Canada is responding to questions at a press conference. Reporters are in seats in front of his podium, raising their hands to get his attention in order to ask their question. The Prime Minister points to reporters one at a time and they ask their question. Once he answers, he points to another reporter so that someone else gets a turn to ask a question.What roles (protocols) are in place that ensure that this conversation begins and ends and also has a structure which allows each party to convey (and/or receive) the message. Which layer is reflected in this scenario and what role of that layer is being fulfil ?