ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 59
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200.1.1.64 is a default routeB. EIGRP is in use in this networkC. The output came from a router that has four physical interfacesD. The output shows that there are three default routesE. The output came from router Certkiller 2F. None of the aboveAnswer: BExplanation:In the routing table the "D" letter marks the route learned from EIGRP routing protocol.Based on the routing table above, there are 4 directly connected IP interfaces, 2 EIGRPlearned routes (which means that EIGRP is in use on this network) and a static defaultroute was also configured.QUESTION 517:You are troubleshooting a routing issue in the Certkiller EIGRP network. In thisnetwork, which statements are true about EIGRP successor routes? (Choose two)A.
Successor routes are flagged as "active" in the routing tableB. Successor routes are saved in the topology table to be used if the primary route failsC. A successor route is used by EIGRP to forward traffic to a destinationD. A successful route may be backed up by a feasible successor routeAnswer: C, DExplanation:Actualtests.com - The Power of Knowing640-802The DUAL finite state machine embodies the decision process for all route computations.It tracks all routes advertised by all neighbors. The distance information, known as ametric, is used by DUAL to select efficient loop free paths.DUAL selects routes to be inserted into a routing table based on feasible successors.
Asuccessor is a neighboring router used for packet forwarding that has a least cost path to adestination that is guaranteed not to be part of a routing loop. When there are no feasiblesuccessors but there are neighbors advertising the destination, a recomputation mustoccur. This is the process where a new successor is determined. The amount of time ittakes to recompute the route affects the convergence time. Even though therecomputation is not processor-intensive, it is advantageous to avoid recomputation if itis not necessary. When a topology change occurs, DUAL will test for feasible successors.If there are feasible successors, it will use any it finds in order to avoid any unnecessaryrecomputation.
Feasible successors are defined in more detail later in this document.Feasible SuccessorsA destination entry is moved from the topology table to the routing table when thereis a feasible successor. All minimum cost paths to the destination form a set. From thisset, the neighbors that have an advertised metric less than the current routing table metricare considered feasible successors.Feasible successors are viewed by a router as neighbors that are downstream with respectto the destination. These neighbors and the associated metrics are placed in theforwarding table.When a neighbor changes the metric it has been advertising or a topology change occursin the network, the set of feasible successors may have to be re-evaluated.
However, thisis not categorized as a route recomputation.Reference:http://www.cisco.com/en/US/tech/ CK3 65/ CK2 07/technologies_tech_note09186a0080093f07.shtml#feasibleQUESTION 518:Three Certkiller routers are connected as show below:Actualtests.com - The Power of Knowing640-802Part of their configurations are shown below:IP Addresses and routing for the network are configured as shown above. TheCertkiller network administrator issued the "show ip eigrp neighbors" commandfrom router Certkiller 1 and receives the output shown.
Based on all the informationprovided above, which statement is true?A. It is normal for Certkiller 1 to show once active neighbor at a time to prevent routingloopsB. The IP addresses are not configured properly on the Certkiller 1 and Certkiller 3interfacesC. The "no auto-summary" command configured on the routers prevents Certkiller 1 andCertkiller 2 from forming a neighbor relationshipD. Routing is not completely configured on Certkiller 3E. None of the aboveAnswer: DExplanation:The Router Certkiller 3 is connected to three different networks: 192.168.3.1/30,192.168.2.2/30, and 10.0.4.0/24 but only 10.0.4.0 and 192.168.2.0 are being advertisedvia EIGRP.
In Certkiller 3, the "network 192.168.3.0" command should be placed underthe EIGRP 10 process.QUESTION 519:The topology table for the Certkiller EIGRP network is shown below from routerCertkiller 3:Actualtests.com - The Power of Knowing640-802You are troubleshooting a routing issue with the Certkiller network. Why doesRouter Certkiller 3 show multiple unequal cost paths to network 192.168.81.0/24?A. Because the EIGRP topology table displays all routes to a destinationB. Because the EIGRP topology table shows only backup routes to a destinationC. Because variance was configured for EIGRP autonomous system 109D. Because multiple floating static routes were configured to network 192.168.81.0 viainterface Serial0E.
None of the aboveAnswer: AQUESTION 520:The routing table of router CK1 is shown below:Based on the routing table of CK1 shown above, which address and maskcombination represents a summary of the routes learned by EIGRP?A. 192.168.25.28 255.255.255.252B. 192.168.25.28 255.255.255.240Actualtests.com - The Power of Knowing640-802C. 192.168.25.16 255.255.255.252D. 192.168.25.0 255.255.255.252E. 192.168.25.16 255.255.255.240F. 192.168.25.0 255.255.255.240Answer: EQUESTION 521:You need to configure EIGRP on a new Certkiller router. What parameters mustyou specify when you enable EIGRP routing?A.
The broadcast address, and AS numberB. The network number and AS numberC. EIGRP routing, network number and passive interfaceD. EIGRP routing, network number, and ASE. None of the above.Answer: DExplanation:To enable EIGRP on your router, you must specify EIGRP routing, the network number,and the AS system number.Example:Router EIGRP 33Network 10.0.0.0In the case above the AS process number is 33.QUESTION 522:The Certkiller router has been configured for EIGRP. Information relating to theconfiguration is displayed in the output shown below:Actualtests.com - The Power of Knowing640-802The EIGRP configuration in the Certkiller router used a single network statement.From the output shown in the graphic, which network statement was used toadvertise these networks in EIGRP?A.
network 172.26.168.128 0.0.0.127B. network 172.26.168.128 area 478C. network 172.26.0.0D. network 172.26.168.0 area 478E. None of the aboveAnswer: CExplanation:The correct configuration statements used in the above were:Router eigrp 478Network 172.26.0.0Incorrect Answers:A. A wildcard mask is not required at the end of the network statement in order toconfigure EIGRP. It is only required for an OSPF configuration. Although a wildcardmask is now supported with EIGRP, the mask used in this example is incorrect.B, D: In EIGRP, the concept of an area does not exist.
This is only used by OSPF.QUESTION 523:Router CK1 is configured to run EIGRP. Which tables of EIGRP route informationare held in RAM and maintained through the use of hello and update packets in thisrouter? (Choose two)A. SPF tableB. Query tableC. RTP tableD. Neighbor tableActualtests.com - The Power of Knowing640-802E. DUAL tableF. Topology tableG. State TableAnswer: D, FExplanation:In EIGRP the only two tables of significance are the neighbor table and the topologytable.Reference: Sybex CCNA Study Guide edition 4, Page 271.QUESTION 524:The Certkiller network is shown in the following exhibit:Based on the Certkiller router configurations shown above, why has this networkfailed to converge?A. The no auto-summary command needs to be applied to the routersB.
The network numbers have not been properly configured on the router sC. The subnet masks for the network numbers have not been properly con figuredD. The autonomous system number has not been properly configuredE. The bandwidth values have not been properly configured on the serial interfacesAnswer: AExplanation:To restore the default behavior of automatic summarization of subnet routes into network-level routes, usethe auto-summary command in router configuration mode.
To disable this function and transmit subprefixrouting information across classful network boundaries, use the no form of this command. Withoutdisabling auto summarization, each router will advertise the 192.168.20.0/24 route, and the specific /26networks will not be known.Actualtests.com - The Power of Knowing640-802QUESTION 525:Which statements are true about EIGRP successor routes? (Choose two)A. A successor route is used by EIGRP to forward traffic to a destination.B. Successor routes are saved in the topology table to be used if the primary route fails.C.
Successor routes are flagged as "active" in the routing table.D. A successor route may be backed up by a feasible successor route.E. Successor routes are stored in the neighbor table following the discovery process.F. Successors are not used in EIGRP.Answer: A, DExplanation:The following are some terms relating to EIGRP:1. Feasible Distance: The lowest calculated metric to each destination2.
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