A) Assume there is a wide-area network with N nodes, where N ≥ 2. What is the smallest number of point-to-point communication links such that every node in the network is able to talk to every other node? (Note: A network in which some nodes are unable to exchange messages with other nodes because there is no path between them is called disconnected.) 

B) If you are worried about having a disconnected network, what type of interconnection structure should you use when configuring your network?