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cisco ccna verification.Partial Routing Update Message _><_| Partial Routing Update Message Figure 1-60 Example of EIGRP Protocol Message ExchangeThe following shows the major enhancements to the Advanced Distance Vector Routing Protocol.Routers will not choose the best path to the destination network based on the number of router stations that are separated from the destination network. Typically, the router will be allowed to determine the best path to the destination network based on link bandwidth and latency. In addition, routers can also combine other metrics (besides bandwidth and latency), such as link load and reliability, to select the best path.Routers will only send and receive complete routing updates at the beginning of the routing protocol operation, and will only transmit partial routing updates when the network topology changes, thus reducing the consumption of link bandwidth by routing protocol traffic.Advanced distance vector routing protocols have more robust mechanisms built in to avoid routing loops and reduce convergence times. For example, EIGRP routers maintain a table of topological information about routes to be advertised and also run an algorithm with a loop avoidance mechanism (called the Diffusion Update Algorithm [DUAL]) to compute the best path to the destination network.3. Link state algorithmThe link-state algorithm is completely different from the DV algorithm in that the main difference is that routers running link-state IP-based routing protocols can sense the complete path to the destination network.The main difference is that a router running a link-state IP-based routing protocol is aware of the complete network topology. That is, such a router can perform algorithms such as Dijkstraor shortest path first (SPF) algorithms to compute the best path to each destination network. OSPF and IS-ISare two of the more notorious link-state IP routing protocols.