Worldwide computer crimes cost organizations and governments billions of dollars each year. In response, organizations use a plethora of heterogeneous security devices and software such as firewalls, Intrusion Detection Systems (IDS), and Security Information and Event Management (SIEM) to monitor networks in conjunction with Computer Security Incident Response Teams (CSIRT) that are responsible for ensuring availability, integrity, and confidentiality of network services. Situational Awareness in Computer Network Defense: Principles, Methods and Applications provides academia and organizations insights into practical and applied solutions, frameworks, technologies, and implementations for situational awareness in computer networks. This book presents situational awareness solutions in Computer Network Defense (CND) currently being researched or deployed. The key objective is to fill a gap that exists in the way CND and security are being approached by formalizing the use of situational awareness in computer network security and defense.