Sniffing is the act of capturing data as it is transferred over a network. The data can then be recorded and used for reconnaissance, or used in an attack. In this course we look at sniffing, the tools and techniques used, protocols that can be spoofed and countermeasures and penetration testing. An ethical hacker is a person who attacks an organizations security on behalf of its owners in order to discover vulnerabilities. Instead of taking advantage of these vulnerabilities, the ethical hacker reports them to the organization who can then put in place the appropriate countermeasures to protect themselves against malicious hackers. This course is the seventh in a series of courses which can used in preparation for the Certified Ethical Hacker 312-50 exam. The course has been developed in partnership with EC-Council and is based on their Ethical Hacking and Countermeasures course materials and labs.