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.

It is important to understand dynamic routing and how the various types of routing protocols, such as distance vector and link-state, determine IP routes. It is equally important to understand scalability and convergence constraints with routing protocols.

In this section we would cover following CCNA objectives

• Describe the purpose and types of dynamic routing protocols
• Describe the operation and implementation of distance vector routing protocols
• Describe the operation and implementation of link-state routing protocols