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CCNA Data Center DCICN 640-911 Official Cert Guide by Chad Hintz, Wendell Odom

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Distance Vector Basics

Each IGP can be categorized based on its internal logic, either DV or LS. As a starting point to better understand IGPs, the next few pages explain more about how a DV protocol actually exchanges routing information. These pages use RIP as an example, showing RIP’s simple hop-count metric, which, although a poor option in real networks today, is a much simpler option for learning.

The Concept of a Distance and a Vector

The term distance vector describes what a router knows about each route. At the end of the process, when a router learns about a route to a subnet, all the router knows is some measurement of distance (the metric) and the next-hop router and outgoing interface to use for that route (a vector, or direction). ...

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