Now that we've discussed some of the major components of networks and TCP/IP, you have the necessary background to examine the more critical issues of security in a converged environment. Knowing how networks are built gives you a better understanding of what physical or logical vulnerabilities are introduced by choosing one particular network design over another. Knowing how packets are formed gives you a better understanding of how they can be crafted or modified to achieve a specific purpose. Knowing how packets are transmitted and delivered gives you a better understanding of what can happen to packets as they travel from source to destination. A good understanding of the basics of networking and TCP/IP is critical to identifying, understanding, and correcting vulnerabilities in your converged environment.