tables on routers and to maintain a loop-free, single path to each network.
This is easier than static or default routing, but you use it at the expense of
router CPU processes and bandwidth usage on the network links. A routing
protocol defines the set of rules used by a router when it communicates
between neighbor routers.
router will first choose the route with the lowest administrative distance. If
two routes have the same AD, then the router will use the routing metrics to
determine the best path to the remote network. If the AD is the same in both
routes, as well as the metrics, then the routing protocol will load balance.
IGP routing protocols are used to exchange routing information with routers
in the same autonomous system (AS). An AS is a collection of networks
under a common administrative domain. EGPs are used to communicate
between ASes. An example of an EGP is the Border Gateway Protocol (BGP),
which is discussed in Chapters 8 through 9.
remote network as a determination of the best path to a remote network.
Each time a packet goes through a router, it's called a hop. The route with
the least number of hops to the remote network is determined to be the
best route. The vector is the determination of direction to the remote
network.
remote network. It is considered a distance-vector protocol because it sends