TAILIEUCHUNG - CCNA 1 and 2 Companion Guide, Revised (Cisco Networking Academy Program) part 72

Cisco Networking Academy Program CCNA 1 and 2 Companion Guide, Revised part 72 is the Cisco approved textbook to use alongside version of the Cisco Networking Academy Program CCNA 1 and CCNA 2 web-based courses. The topics covered provide you with the necessary knowledge to begin your preparation for the CCNA certification exam (640-801, or 640-821 and 640-811) and to enter the field of network administration. | Page 679 Tuesday May 20 2003 2 53 PM Routing Basics 679 Routing protocol Protocol that supports a routed protocol by providing mechanisms for sharing routing information. Routing protocol messages move between the routers. A routing protocol allows the routers to communicate with other routers to update and maintain tables. TCP IP examples of routing protocols are listed here Routing Information Protocol RIP Interior Gateway Routing Protocol IGRP Enhanced Interior Gateway Routing Protocol EIGRP Open Shortest Path First OSPF Figure 15-4 Router and Routing Protocols Routed Protocol Example IP Network Protocol Destination Network Exit Port to Use Protocol Name Routing Protocol Examples RIP IGRP Network Layer Protocol Operations Suppose that a host application needs to send a packet to a destination on a different network. The host addresses the data link frame to the router using the address of one of the router s interfaces. The router s network layer process examines the incoming packet s Layer 3 header to determine the destination network and then references the routing table which associates networks to outgoing interfaces see Figure 15-5 . The packet is encapsulated again in the data link frame that is appropriate for the selected interface and is queued for delivery to the next hop in the path. Page 680 Tuesday May 20 2003 2 53 PM 680 Chapter 15 Routing and Routing Protocols Figure 15-5 Router Services This process occurs each time that the packet is forwarded through another router. When the packet reaches the router that is connected to the destination host s network it is encapsulated in the destination LAN s data link frame type and is delivered to the destination host. Multiprotocol Routing Routers are capable of supporting multiple independent routing protocols and maintaining routing tables for several routed protocols. This capability allows a router to deliver packets from several routed protocols over the .

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