ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 52
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The router will use the OSPF route.C. The route will use the EIGRP route.D. The router will load balance and use all three routes.E. None of the aboveActualtests.com - The Power of Knowing640-802Answer: AExplanation:When a router learns about the same network via multiple sources, the router will choosethe source with the lowest administrative distance (AD).
By default, the AD for theserouting protocols are:Connected Interface has 0 ADStatic Route : 1EIGRP : 90OSPF : 110So, the static route will be chosen since it has the lowest AD.QUESTION 466:A Certkiller router learns two routes to a remote network, one route via OSPF andone route via RIPv2. The network administrator wants the router to install theroute learned via RIPv2 into its routing table. What should the networkadministrator configure to ensure that the router will use the route learned viaRIPv2?A. Nothing. The router will automatically use routes learned via RIP over routes learnedvia OSPF.B.
The network administrator should configure the routers along the OSPF path withlower priority numbers.C. The network administrator should configure the router interface on the OSPF path tobe a passive interface.D. The network administrator should configure an administrative distance for RIP that islower than the administrative distance of OSPF.E. If two paths exist to a remote network, the only way to force the router to prefer onepath over the other is to configure the preferred path as a static route.Answer: DExplanation:When multiple routing protocols are configured for the same networks, the router willuse the path with the lowest Administrative Distance (AD).
By default, OSPF has andAD of 110 and RIP has an AD of 120. In order to ensure that the router prefers the routelearned via RIP over OSPF, the AD of the RIP route must be reduced to a value less than110.QUESTION 467:Routers Certkiller 1 and Certkiller 2 are connected as shown below:Actualtests.com - The Power of Knowing640-802The Certkiller network associate has configured the internetwork that is shownabove, but has failed to configure routing properly. Which configurationcombinations will allow the hosts on the Certkiller 2 LAN to access resources on theCertkiller 1 LAN with the least impact on router processing and WAN bandwidth?A. Certkiller 1(config)# router ospf 1Certkiller 1(config-router)# network 192.168.2.4 0.0.0.3 area 0Certkiller 1(config-router)# network 172.16.25.0 0.0.0.255 area 0Certkiller 2(config)# router ospf 1Certkiller 2 (config-router)# network 192.168.1.0 0.0.0.255 area 0Certkiller 2 (config-router)# network 192.168.2.4 0.0.0.3 area 0B.
Certkiller 1(config)# router ripCertkiller 1(config-router)# network 192.168.2.0Certkiller 1(config-router)# network 172.16.0.0Certkiller 2(config)# router ripCertkiller 2 (config-router)# network 192.168.1.0Certkiller 2 (config-router)# network 192.168.2.0C. Certkiller 1(config)# ip route 192.168.1.0 255.255.255.0 192.168.2.5Certkiller 2(config)# ip route 172.16.25.0 255.255.255.0 192.168.2.6D.
Certkiller 1(config)# router eigrp 56Certkiller 1(config-router)# network 192.168.2.4Certkiller 1(config-router)# network 172.16.25.0Certkiller 2(config)# router eigrp 56Certkiller 2 (config-router)# network 192.168.1.0Certkiller 2 (config-router)# network 192.168.2.4Answer: CQUESTION 468:You need to choose a routing protocol for use in the Certkiller network that meetsthe following requirements:Actualtests.com - The Power of Knowing640-802Which routing protocol fulfills these requirements?A. OSPFB.
RIPv2C. RIPv1D. EIGRPE. None of the aboveAnswer: AQUESTION 469:You have been tasked with choosing a routing protocol that would best fit the needsof the Certkiller network. Which routing protocol uses bandwidth and delay asmetrics, by default?A. EIGRPB. OSPFC. BGPD. RIPv1E. RIPv2F. None of the aboveAnswer: AQUESTION 470:Non-contiguous networks can pose a problem for network reachability in certaincircumstances.
Which of the following routing protocols have means of minimizingthe risk? (Select three choices)A. RIP v1B. RIP v2C. EIGRPD. IGRPE. OSPFF. VLSMActualtests.com - The Power of Knowing640-802Answer: B, C, EExplanation:OSPF, RIP version 2, and EIGRP all provide support for discontiguous networks.
This isprovided by the fact that subnet mask information is advertised along with the routes, andthese protocols all support Variable Length Subnet Masks (VLSM).Incorrect Answers:A. Whenever RIP version 1 advertises a network across a different major net boundary,RIP summarizes the advertised network at the major net boundary. RIP version 2 is anupdated version of RIP, and one of the main features that it was able to provide overRIPv1 is support for VLSM information.D. IGRP does not support VLSM. Like RIP version 2, EIGRP is the updated version ofIGRP, which provides support for VLSM.F. VLSM is the feature that is required to support non-contiguous networks, but VLSM isnot itself a routing protocol.QUESTION 471:Which of the following technologies can be used in distance vector routing protocolsto prevent routing loops? (Select two)A.
Spanning Tree ProtocolB. Shortest path first treeC. Link-state advertisements (LSA)D. Hold-down timersE. Split horizonF. VRPAnswer: D, EExplanation:In order to prevent information from looping throughout a network, distance vectorprotocols, such as RIP version 2, use the following mechanisms:* Splithorizon - the routing protocol advertises routes out an interface only if they werenot learned from updates entering that interface.* Hold-down timer - After finding out that a router to a subnet has failed, a router waits acertain period of time before believing any other routing information about that subnet.In addition to these, a finite number of hops are also used.
This ensures that packets donot loop through a network indefinitely.Reference: CCNA Self-Study CCNA ICND exam certification Guide (Cisco Press,ISBN 1-58720-083-X) Page 154.QUESTION 472:Actualtests.com - The Power of Knowing640-802Which of the following routing protocols are less likely prone to problems in noncontiguous networks? (Select all valid responses)A. IGRPB.
ICMPC. OSPFD. RIP v1E. RIP v2F. EIGRPAnswer: C, E, FExplanation:OSPF, RIP v2, and EIGRP all support VLSM information, which will eliminate theproblems that can arise from non contiguous networks.Incorrect Answers:A, D. IGRP and RIP version 1 are distance vector routing protocols that do not supportVLSM information, so they are prone to problems that can arise from discontiguousnetwork schemes.B. ICMP (Internet Control Message Protocol) is not a routing protocol. It is usedprimarily for the management and monitoring of networks.QUESTION 473:Which of the following statements describe the characteristic of link state routingprotocols? (Choose all that apply.)A. The exchange of an advertisement is triggered by a change in the network.B.
All routers exchange routing tables with each other in a multipoint network.C. Packets are routed based upon the shortest path to the destination.D. Paths are chosen depending on the cost efficiency factor.E. Every router in an OSPF area is capable of representing the entire network topology.F. Only the designated router in an OSPF area can represent the entire network topology.Answer: A, C, EExplanation:The predominant link state routing protocols are OSPF and IS-IS. The followingdescribes the features and functionality of OSPF:Open Shortest Path First* Each router discovers its neighbors on each interface.
The list of neighbors is kept in aneighbor table.* Each router uses a reliable protocol to exchange topology information with itsneighbors.Actualtests.com - The Power of Knowing640-802* Each router places the learned topology information into its topology database.* Each router runs the SPF algorithm against its own topology database.* Each router runs the SPF algorithm against its own topology database to calculate thebest routes to each subnet in the database.* Each router places the best roué to each subnet into the IP routing table.The following list points out some of the key features of OSPF:* Converges very quickly - from the point of recognizing a failure, it often can convergein less than 10 seconds.* Supports VLSM.* Uses short Hello messages on a short regular interval, with the absence of hellomessages indicating that a neighbor is no longer reachable.* Sends partial updates when link status changes and floods full updates every 30minutes.
The flooding, however, does not happened all at once, so the overhead sminimal.* Uses cost for the metric.Reference: CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press,ISBN 1-58720-094-5) Page 417QUESTION 474:What are the different characteristics of distance vector and link state routingprotocols?A. Distance vector protocols send the entire routing table to directly connectedneighbors.B. Distance vector protocols are responsible for sending updates to all networks listed inthe routing table.C.
Link state protocols are responsible for sending the entire routing table to the wholenetwork.D. Link state protocols send updates regarding their own links status to all other routerson the network.E. None of the aboveAnswer: A, DExplanation:Distance Vector Protocols:Distance Vector Protocols advertise routing information by sending messages, calledrouting updates, out the interfaces on a router. These updates contain a series of entries,with each entry representing a subnet and a metric.Link-State Protocols:Sends partial updates when link status changes and floods full updates every 30 minutes.The flooding, however, does not happen all at once, so the overhead is minimal.Reference: CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press,ISBN 1-58720-094-5) Page 413 + 419Actualtests.com - The Power of Knowing640-802QUESTION 475:Which one of the following statements best explains the split horizon rule used indistance vector routing protocols?A.
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