Defending against spoofing is an important part of security throughout the internet. With- out the ability to authenticate, within a certain confidence, that a person is in fact who they say are, can allow attackers to go unrecognized after performing an attack. It is much too easy for attackers today to hide their identity or pretend to be someone else through the means of spoof- ing. Researchers must focus their efforts on defenses that are scalable and effective in counter- ing spoofing. This thesis focuses on surveying different types of spoofing as well as attacks that lever- age spoofing with the hopes to hide the attacker's identity or leverage identity theft to perform an attack. It also looks at current defenses that hope to counter attacks that leverage spoofing and evaluates how realistic is to implement the defenses in terms of scalability and effective- ness. By surveying different attacks and defenses, researchers will be able to better focus their efforts on more effective and scalable defenses to spoofing and attacks that leverage spoofing.