ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 60
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Feasibility Condition: A condition that is met if a neighbor's advertised distance to adestination is lower that the router's Feasible Distance to that same destination.3. Successor: The neighbor that has been selected as the next hop for a given destinationbased on the Feasibility Condition.Reference: Jeff Doyle, Routing TCP/IP, Volume I, Chapter 8: Enhanced InteriorGateway Routing Protocol (EIGRP), p.336-337, Cisco Press, (ISBN 1-57870-041-8)Additional info:The Feasible Condition is met when the receiving router has a Feasible Distance (FD) toa particular network and it receives an update from a neighbor with a lower advertised orReported Distance (RD) to that network.
The neighbor then becomes a FeasibleSuccessor (FS) for that route because it is one hop closer to the destination network.There may be a number of Feasible Successors in a meshed network environment.The RD for a neighbor to reach a particular network must always be less than the FD forthe local router to reach that same network. In this way EIGRP avoids routing loops. Thisis why routes that have RD larger than the FD are not entered into the Topology table.Reference: Ravi Malhotra, IP Routing, Chapter 4: Enhanced Interior Gateway RoutingProtocol (EIGRP), O'Reilly Press, January 2002 (ISBN 0-596-00275-0)QUESTION 526:Which one of the following EIGRP commands can check the IP addresses of theadjacent neighbors, as well as verifying the EIGRP retransmit intervals and queuecounts?A.
CK1 #show ip eigrp adjacencyB. CK1 #show ip eigrp topologyC. CK1 #show ip eigrp interfacesActualtests.com - The Power of Knowing640-802D. CK1 #show ip eigrp neighborsE. None of the aboveAnswer: DExplanation:The topology database contains information from all of the LSA packets that have beenreceived for an area. The topology database is updated by the LSAs. Each router withinthe area has exactly the same topology database. All routers must have the same vision ofthe networks; otherwise, confusion, routing loops, and loss of connectivity will result.Note: The topology database is the router's view of the network within the area. Itincludes every OSPF router within the area and all the connected networks. This databaseis indeed a routing table, but a routing table for which no path decisions have been made;it is at present a topology database.Reference: "CCNP BSCI Exam Certification Guide Third Edition" by Clare Gough,CCIE No.
2893, Page 197.QUESTION 527:The Certkiller network consists of two routers as shown below:Both routers Certkiller and HG are configured for EIGRP. Unfortunately, users onthe Certkiller networks are unable to reach users on the HG networks. Whichcommand could you enter on Certkiller to correct this problem?A. Certkiller (config-router)# version 2B. Certkiller (config-router)# no auto-summaryC. Certkiller (config-router)# redistribute eigrp 44D. Certkiller (config-router)# EIGRP log-neighbor-changesE. Certkiller (config-router)# default-information originateAnswer: BActualtests.com - The Power of Knowing640-802Explanation:By default, EIGRP will auto-summarize IP information at the network boundaries.
In thisexample, the 192.168.10.0 network is subnetted into 6 separate networks. Therefore, eachrouter will only advertise the 192.168.10.0/24 network to each other by default. Todisable this function and transmit sub-prefix routing information across classful networkboundaries, auto summarization must be disabled.Incorrect Answers:A. There is only one version of EIGRP.C. Based on the diagram, each router is already configured for EIGRP 44.D.
This will have no impact on the routes.E. This will generate a default route, which will be advertised to the other router.However, a default route is not needed, as the individual subnets need to be advertised,not a default route.QUESTION 528:Certkiller .com has a large corporate network that uses multiple routing protocols.Hosts in a portion of the network that uses EIGRP have become unreachable.Which router command will allow you, the network technician, to view the status ofthese routes?A. Certkiller # show eigrp entriesB. Certkiller # show protocolsC.
Certkiller # debug eigrp routesD. Certkiller # show ip route eigrpE. Certkiller # show route eigrpAnswer: DExplanation:The show ip route and show ip route eigrp commands both list the EIGRP-learned routeswith a D beside them. D signifies EIGRP.
The letter E was already being used forExterior Gateway Protocol (EGP) when Cisco created EIGRP, so it choose thenext-closest letter to denote EIGRP-learned routes. You can see information aboutEIGRP neighbors with the show ip eigrp neighbors command, and the number of activeneighbors (called peers in the command ouput) with the show ip eigrp interfacescommand.Reference: Cisco CCNA ICND 640-811 p.211QUESTION 529:Which command displays EIGRP-related router activities as they occur?Actualtests.com - The Power of Knowing640-802A.
Certkiller # show ip route *B. Certkiller # debug eigrp routeC. Certkiller # debug ip eigrpD. Certkiller # debug ip protocols eigrpE. Certkiller # show ip route eigrpF. None of the aboveAnswer: CExplanation:The debug ip eigrp command helps you analyze the packets that are sent and received onan interface.
Because the debug ip eigrp command generates a substantial amount ofoutput, only use it when traffic on the network is light.Examples:The following is sample output from the debug ip eigrp command:Certkiller # debug ip eigrpIP-EIGRP: Processing incoming UPDATE packetIP-EIGRP: Ext 192.168.3.0 255.255.255.0 M 386560 - 256000 130560 SM 360960 256000 104960IP-EIGRP: Ext 192.168.0.0 255.255.255.0 M 386560 - 256000 130560 SM 360960 256000 104960IP-EIGRP: Ext 192.168.3.0 255.255.255.0 M 386560 - 256000 130560 SM 360960 256000 104960IP-EIGRP: 172.69.43.0 255.255.255.0, - do advertise out Ethernet0/1IP-EIGRP: Ext 172.69.43.0 255.255.255.0 metric 371200 - 256000 115200IP-EIGRP: 192.135.246.0 255.255.255.0, - do advertise out Ethernet0/1IP-EIGRP: Ext 192.135.246.0 255.255.255.0 metric 46310656 - 45714176 596480IP-EIGRP: 172.69.40.0 255.255.255.0, - do advertise out Ethernet0/1IP-EIGRP: Ext 172.69.40.0 255.255.255.0 metric 2272256 - 1657856 614400IP-EIGRP: 192.135.245.0 255.255.255.0, - do advertise out Ethernet0/1IP-EIGRP: Ext 192.135.245.0 255.255.255.0 metric 40622080 - 40000000 622080IP-EIGRP: 192.135.244.0 255.255.255.0, - do advertise out Ethernet0/1QUESTION 530:Refer to the Certkiller network shown below:Actualtests.com - The Power of Knowing640-802In this network, CK1 can ping across the serial link to 172.168.10.5, but cannot pingthe FastEthernet interface of CK2 (172.168.10.65).
The routing protocol being usedis EIGRP, and the routing table of CK2 is shown. Which two statements could bethe cause of this problem? (Choose two)A. The serial interface does not have the clockrate set.B. EIGRP is not enabled on one of the routers.C. The IP addressing scheme has overlapping subnetworks.D. The IP addressing scheme is using subnet zero but the ip subnet-zero command hasnot been enabled on one or both of the routers.E. The FastEthernet interface of CK2 is administratively shutdown.F. The EIGRP autonomous system numbers configured on the two routers do not match.Answer: B, FExplanation:You can successfully ping over the serial link, which tells us the serial interface isproperly configured, but you are unable to ping a network that is not directly connected.Since no EIGRP routes appear in the routing table, this tells us there is something wrongwith the EIGRP configuration on either router.
The most likely problem is that EIGRP isnot enabled on one of the routers, or the EIGRP AS numbers do not match on eachrouter.QUESTION 531:The Certkiller EIGRP network is displayed in the following diagram:Actualtests.com - The Power of Knowing640-802Refer to the graphic. Certkiller is running EIGRP. Hosts from the 200.1.1.0/26subnet cannot access a server located on the 200.1.1.64 subnet. The users havepreviously been able to access this server. After router Certkiller 1 is accessed withthe use of Telnet, which of the following commands would be a logical first choice introubleshooting this problem?A. Certkiller 1# show interface s0/0B. Certkiller 1# show controllersC. Certkiller 1# show ip routeD. Certkiller 1# show hostsE.
None of the aboveAnswer: CExplanation:Since the network was previously accessible, and users are only unable to reach aspecific subnet, it can be safely assumed that a routing issue is the problem, so viewingthe routing table to see how traffic destined to the 200.1.1.64/26 subnet is being routedwould be a logical first step.Incorrect Answers:A, B. These commands would be used if we had a reason to believe that there was aphysical problem with the circuit itself. However, since we can safely telnet into therouter remotely, and users appear to be able to reach other networks, we can assume thatthe physical serial interface is working properly.D. The "show hosts" command is used to display the default domain name, the style ofname lookup service, a list of name server hosts, and the cached list of host names andaddresses on the network to which you can connect. It will not help us in any way in thisexample.Actualtests.com - The Power of Knowing640-802QUESTION 532:Three Certkiller routers are connected as shown below:Based on the information shown above, which of the routers shown could producethe output shown?A.
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