Assume that we have a network with the following machines: 10.75.40.1 10.75.40.45 10.75.40.65 10.75.40.100 10.75.40.150 10.75.40.175 10.75.40.200 a) If these machines are connected via a hub and we transmit from one of these machines to the other, how many of these machines "see" the packets? (Give an exact number, and include the machine that initially sent the packet in your count, since it "sees" the packet too.)

It is said in Networking that a Hub is a dumb device means that it does not perform any look up while forwarding the data frame but broadcasts it indiscriminately which cause flooding. So in the given Question there are 7 devices  which are connected to the Hub . When any one of them sends data frame to another one, the Hub broadcasts this data to all the machines connected to Hub. So the number of devices that see a particular message including sender is 7 and that is the answer.

it would be a. excessive network collisions or d. slow connectivity between devices those would be my answer.