Routers use routing protocols to exchange routing information. Routing protocols allow routers to learn from other routers the networks that are available so that data can be sent in the correct direction. Remember that two routers communicating with each other must use the same routing protocol or they can't understand each other.
The TCP/IP protocol suite includes the following routing protocols:
■ Routing Information Protocol (RIP), versions 1 and 2 (RIPvl and RIPv2)
■ Enhanced Interior Gateway Routing Protocol (EIGRP)
■ Open Shortest Path First (OSPF)
■ Integrated Intermediate System-to-Intermediate System (IS-IS)
■ Border Gateway Protocol (BGP) Version 4 (BGP-4)
NOTE These routing protocols are discussed further in Chapter 7, "Selecting Routing Protocols for the Network."
The previous sections introduced the basics of routing and how routers learn about the available networks so that data can be sent along the correct path. Routers look at the packet's destination address to determine where the packet is going so that they can then select the best route to get the packet there. The following section discusses these addresses.
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