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Hybrid protocols, such as RIPv2 and EIGRP, take the advantages of both
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distance vector and link state protocols and merge them together
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Distance Vector Protocol Problems and Solutions
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Distance vector protocols converge slowly because of periodic updates Some
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protocols overcome this by using triggered updates
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Distance vector protocols are prone to routing loops To solve this, they use
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these mechanisms: hop count limits, split horizon, poisoned routes, and holddown timers
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protocols typically place a hop count limit as to how far a packet is legally allowed to travel, referred to as maximum hop count or TTL
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Split horizon states that if a neighboring router sends a route to a router, the
receiving router will not propagate this route back to the advertising router on the same interface
With route poisoning, when a router detects that one of its connected routes
has failed, the router will poison the route by assigning an infinite metric to it and advertising it to neighbors When a router advertises a poisoned route to its neighbors, its neighbors break the rule of split horizon and send back to the originator the same poisoned route, called a poison reverse In order to give the routers enough time to propagate the poisoned route and to ensure that no routing loops occur while propagation occurs, the routers implement a hold-down mechanism
15: Routers and Routing
SELF TEST
The following Self Test questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully, as there may be more than one correct answer Choose all correct answers for each question
Routing Introduction
1 __________ is/are a routed protocol A B C D A B C D RIP OSPF Both RIP and OSPF Neither RIP nor OSPF BPG EGP IPP IGP
2 A(n) __________ routes between different autonomous systems
3 Your router is running RIP and OSPF and both routing protocols are learning 19216810/24 Which routing protocol will your router use for this route A RIP B OSPF
Dynamic Routing Protocols
4 A routing protocol will use a(n) __________ to determine which path is the best path A B C D Administrative distance Metric Hop count Cost
5 Which type of routing protocol uses the Shortest Path First algorithm A Distance vector B Link state C Hybrid
Self Test
6 Which is an example of a hybrid protocol A B C D IS-IS EIGRP RIPv1 OSPF
Distance Vector Protocol Problems and Solutions
7 What would you use to prevent a packet from traveling around a routing loop forever A B C D Split horizon Poison reverse Hold-down timer TTL
8 __________ states that if a neighboring router sends a route to a router, the receiving router will not propagate this route back to the advertising router on the same interface A B C D A B C D Split horizon Poison reverse Hold-down timer Hop count limit It has a metric of 0 assigned to it It has an infinite metric assigned to it It has an administrative distance of 0 assigned to it It has an infinite administrative distance assigned to it
9 How would you know that a route has been poisoned in the routing table
10 You are 10 hops away from a destination network and intermediate routers are running RIP as a routing protocol You ping a host in the destination network, but the ICMP message you receive back is TTL expired in transit What could cause this problem A B C D A link is down between an intermediate router and the destination network There is a mismatch in the administrative distances of RIP A routing loop exists The destination host has a physical layer problem
15: Routers and Routing
SELF TEST ANSWERS
Routing Introduction
1 D RIP and OSPF are routing protocols, not routed protocols Routed protocols are TCP/IP, IPX, AppleTalk, and so on Answers A, B, and C are routing protocols, not routed protocols 2 B An Exterior Gateway Protocol (EGP) routes between autonomous systems D routes within an AS A and C are nonexistent routing protocols 3 B OSPF has a lower administrative distance of 110 The lower one is given preference A is incorrect because it has a higher administrative distance of 120
Dynamic Routing Protocols
4 B A routing protocol will use a metric to determine which path is the best path A is incorrect because administrative distance is used to choose between different routing protocols, not within a routing protocol Answers C and D are types of metrics 5 B Link state protocols use the SPF algorithm, developed by Dijkstra, to choose the best path to a destination A is incorrect because a distance vector uses distance and direction when choosing best paths C is incorrect because hybrid protocols typically use methods based on distance vector protocols 6 B EIGRP is a hybrid protocol, along with RIPv2 A and D are incorrect because IS-IS and OSPF are link state protocols C is incorrect because RIPv1 is a distance vector protocol
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