5. References Some images were provided by FreeFoto.com. http://www.freefoto.com/index.jspFreeFotoon-line images are covered by the Creative Commons license for non-commercial, no derivatives, attribution license (http://creativecommons.org/licenses/by-nc-nd/3.0/). This provides for use in any media providing it is not for commercial purposes and they are not making a derivative image or gallery. US_CERT. Retrieved June 20, 2009 from http://www.us-cert.gov/cas/tips/ Ciampa, M. (2008). Security+ Guide to Network Security Fundamentals (3rd ed.). Boston: Course Technology Safeguarding Your Data