Refer to the following article by Peter Elkind (http://nics.syr.edu/wp-content/uploads/2016/04/Inside-the-Hack-of-the-Century.pdf (Links to an external site.)Links to an external site.) to answer the following questions:

What attack method is believed to have been used to gain the initial foothold at Sony? What controls were lacking inside the network that might have prevented or delayed further ingress or enabled the intrusion to be detected?