|  |  | Overview
In "IP Addressing," you learned the process of configuring Internet Protocol (IP) addresses. In this chapter, you will learn about the router's use and operations in performing the key internetworking function of the Open System Interconnection (OSI) reference model's network layer, Layer 3. In addition, you will learn the difference between routing and routed protocols and how routers track distance between locations. Finally, you will learn about distance-vector, link-state, and hybrid routing approaches and how each resolves common routing problems.