As an enterprise grows beyond a single location, it becomes necessary to interconnect LANs in various locations to form a WAN. Several technologies are involved in the functioning of WANs. This course describes the technologies, functions, and characteristics of WANs. Routing is the process of determining where to send data packets that are destined for addresses outside the local network. Routers gather and maintain routing information to enable the transmission and receipt of these data packets. Routing information takes the form of entries in a routing table, with one entry for each identified route. The router can use a routing protocol to create and maintain the routing table dynamically so that network changes can be accommodated whenever they occur. To effectively manage an IP network, you must understand the operation of dynamic routing protocols and the impact that they have on an IP network. This course discusses the need for routing protocols and describes the differences between interior and exterior routing protocols and also between link-state and distance vector routing protocols. The operation of link-state protocols is also explained. OSPF is an IGP that was designed by the IETF. Because OSPF is a widely deployed standard protocol, knowledge of its configuration and maintenance is essential. This course describes the function of OSPF and explains how to configure a single-area OSPF network on a Cisco router.

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