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| IGRP |
| The 3 major portions of an IP address are: 1. Host 2. Network 3. Subnetwork The TCP/IP Network Layer Protocols functions are: Path Determination The TCP/IP Network Layer Protocols determine path by: Layer 3 path determination. Routing Protocols 1.Router packet delivery process - Routers check the bottom three layers to determine the destination address. 2.Static Routes - Routes that are manually entered by an administrator. 3.Dynamic routing protocols - Protocols that adjust automatically to network and topology changes. 4.Routed Protocols - Protocols that are moved over a network, such as TCP/IP and IPX. 5.Routing Protocols - Protocols that route routed protocols throughout a network. Examples include: IGRP, Enhanced IGRP, OSPF, EGP, BGP and Is-Is. 6.A routers routing table - Stores Network destinations and the metrics associated with the destination. 7.Routing metrics are - What determines the distance from the destination to the route. This includes, Bandwidth, load, reliability, hop count and MTU. 8.Distance Vector routing protocols - Class of protocols that iterate on the number of hops in a route to fing a shortest-path spanning tree. Distance vector protocols call for each router to send its entire routing table in each update, but only to its neighbors. Distance vector routing algorithms can be prone to routing loops, but are computationally simpler than link state routing algorithms. Examples Include: rip and igrp. 9.Link State routing protocols - Where each router broadcasts or multicasts information regarding the cost of reaching each of its neighbors to all nodes in the internetwork. The Link State algorithms create a consistant view of the network and are therefore not prone to routing loops, but they achieve this at the cost of relatively greater computational difficulty and more widespread traffic. Examples Include: OSPF, Is-Is, and NLSP. 10.Convergance is - The speed and ability of a group of internetworking devices running a specific routing protocol to agree on the topology of an internetwork after a change in that topology. 11.Autonomous networks are - under a common administration sharing a common routing strategy. Autonomous systems are subdivided by areas. An autonomous system must be assigned a unique 16-bit number by the IANA. 12.Interior Gateway Protocols are - Any internetwork protocol used to exchange routing information within an autonomous system. 13.Exterior Gateway Protocols are - Any internetwork protocol used to exchange routing information between autonomous systems. 14.The IGRP router command sequence is - Router(config)# router igrp autonomous-system Router(config)# network network-number Lesson Reflection In our district WAN design we used IGRP because - it is more efficient than RIP in that it bases path selection on more than hop count. |
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