Chapter 7. Cisco Layer 3 Routing

Terms you'll need to understand:

• Routing protocols

• Routing algorithms

• Distance vector

• Link state

• Network discovery

• Routing metrics

• RIP

• IGRP

Techniques you'll need to master:

• Understand path determination

• Determine strengths of link state and distance vector protocols in differing configurations

• Describe ways of increasing stability of link state and distance vector protocols

• Describe the goals of routing protocols

• List routing protocols and path determination

• Describe convergence as impacted by different protocols

• Be able to compare and contrast the following types of routing protocols:

  Static versus dynamic

  Single path versus multi-path

  Flat versus hierarchical

  Interior versus exterior

  Distance vector versus link state

Now that you have mastered the art of IP addressing and subnetting, it is time to take you to a new level: the wonderful world of routing. Cisco is a company that has the world's most famous routers, but you already know that and this is why you want to be successful when taking your CCNA exams. In a nutshell , routing occurs in the Network layer (Layer 3) of the OSI reference model. By sending packets from the source network to the destination network, the Network layer gives its best effort in the delivery of end-to-end services. In this chapter we will be describing the intricacies of that process.