TAILIEUCHUNG - CCNA 1 and 2 Companion Guide, Revised (Cisco Networking Academy Program) part 47

Cisco Networking Academy Program CCNA 1 and 2 Companion Guide, Revised part 47 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 429 Tuesday May 20 2003 2 53 PM Routed Routable and Routing Protocols 429 Routing protocol 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. Here are some TCP IP examples of routing protocols Routing Information Protocol RIP Interior Gateway Routing Protocol IGRP Enhanced Interior Gateway Routing Protocol EIGRP Open Shortest Path First OSPF For a protocol to be routable it must provide the capability to assign a network number as well as a host number to each individual device. Some protocols such as Internetwork Packet Exchange IPX only require that an administrator assign a network number because they use a host s Media Access Control MAC address for the physical number. Other protocols such as IP require that a complete address be provided as well as a network mask. Both the IP address and network mask are required to have a routed network. A network mask separates the network and host portions of a 32-bit IP address. IPX uses the MAC address concatenated with an administrator-assigned network address to create the complete address and does not use a network mask. With IP addresses the network address is obtained by comparing the address with the network mask. A network mask allows groups of sequential IP addresses to be treated as a single unit. If this grouping were not allowed each host would have to be mapped individually for routing. That would not be possible with the millions of hosts on the Internet. As shown in Figure 8-2 all 254 addresses in the sequence of to can be represented by the network address . This allows data to be sent to any one of these hosts just by locating the network address. This means that routing tables need to contain only one entry of instead of all 254 individual entries. .

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