In a brief and concise paper of 3 to 4 double-spaced pages (750 to 1100 words), identify and describe key security vulnerabilities associated with the network, encompassing the physical security of a building (paying close attention to the areas an attacker would focus on), network, and the applications . Explain why and how these vulnerabilities could be exploited and what their impacts are if not addressed. Incorporate a minimum of three references (two external and one internal). Provide in-text citations and reference in accordance with APA guidelines.