ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 61
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Certkiller 1B. Certkiller 2C. Certkiller 3D. Cannot be determined from the information shownAnswer: AExplanation:The following is sample output from the show ip eigrp topology command:Router# show ip eigrp topologyIP-EIGRP Topology Table for process 77Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,r - Reply statusP 172.16.90.0 255.255.255.0, 2 successors, FD is 0via 172.16.80.28 (46251776/46226176), Ethernet0via 172.16.81.28 (46251776/46226176), Ethernet1Actualtests.com - The Power of Knowing640-802via 172.16.80.31 (46277376/46251776), Serial0P 172.16.81.0 255.255.255.0, 1 successors, FD is 307200via Connected, Ethernet1via 172.16.81.28 (307200/281600), Ethernet1via 172.16.80.28 (307200/281600), Ethernet0via 172.16.80.31 (332800/307200), Serial0Since in our example, the networks listed are connected are 192.168.2.0 and192.168.10.0, this command must have been issued on router Certkiller 1.QUESTION 533:The Certkiller network topology is displayed below:Exhibit, Certkiller 1 configurationBased on the output of the Certkiller 1#show ip routecommand shown above and theinformation displayed in the network topology exhibit, which of the following is apotential routing problem?A.
The use of summarization for discontiguous networksActualtests.com - The Power of Knowing640-802B. the use of CIDR with a routing protocol that does not support itC. the use of VLSM with a routing protocol that does not support itD. The use of the no auto-summary command with a protocol that does not supportsummarizationE. the use of the ip route 0.0.0.0 0.0.0.0 command with a routing protocol that does notsupport itAnswer: AExplanation:By default, EIGRP will automatically summarize networks at their network boundary,which can cause problems with dis-contiguous IP networks.
Since the IP routing tabledoes indeed show a summary route to null 0, the default behavior of EIGRP was notmodified. In this network, it would be best to disable the automatic summarizationfeature of EIGRP.QUESTION 534:The Certkiller WAN is using EIGRP. Which two of the following are validcharacteristics of this routing protocol? (Select two answer choices)A. Has a maximum hop count of 25B. Can differentiate between internal and external routesC. Uses a 32-bit metricD. Can maintain only one routing tableE.
Need all networks to use the same subnet maskF. Supports only one routed protocolAnswer: B, CExplanation:By default, the EIGRP composite metric is a 32-bit quantity that is a sum of the segmentdelays and the lowest segment bandwidth.Enhanced IGRP supports internal and external routes. Internal routes originate within anEnhanced IGRP AS. Therefore, a directly attached network that is configured to runEnhanced IGRP is considered an internal route and is propagated with this informationthroughout the Enhanced IGRP AS. External routes are learned by another routingprotocol or reside in the routing table as static routes. These routes are taggedindividually with theidentity of their origin.Incorrect Answers:A. This choice is wrong since it does not use hop count but a metrics that includes:bandwidth*, delay*, load, reliability, and MTU size.
(* used by default).D. This choice is wrong since we know that it keeps a three tables (neighbor table,topology table, and route table) and if you want to be a nit pick and say it still onlyActualtests.com - The Power of Knowing640-802supports one route table, then if you configure IP and IPX on the router, you will havetwo route tables one for each protocol.E.
This choice is wrong since we know that EIGRP supports VLSM.F. This choice is wrong since we know it supports IP, IPX and AppleTalk.QUESTION 535:Router CK1 is running EIGRP. In EIGRP; what is a feasible successor (FS) andwhere is it stored in this router?A. A FS is a primary route, stored in the routing tableB. A FS is a backup route, stored in the routing tableC.
A FS is a backup route, stored in the topology tableD. A FS is a primary route, stored in the topology tableE. None of the aboveAnswer: CExplanation:The following are some terms relating to EIGRP:1. Feasible Distance: The lowest calculated metric to each destination2. 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 536:Router CK1 is running EIGRP. In what location are EIGRP successor routes storedin this router?Actualtests.com - The Power of Knowing640-802A.
In the routing table only.B. In the neighbor table only.C. In the topology table only.D. In the routing table and neighbor table.E. In the routing table and topology table.F. In the topology table and neighbor table.G. None of the aboveAnswer: EExplanation:A destination entry is moved from the topology table to the routing table when there is afeasible successor. All minimum cost paths to the destination form a set. From this set,the neighbors that have an advertised metric less than the current routing table metric areconsidered 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. Successor information is needed by the routing table and by thetopology table, so they are stored in both.QUESTION 537:Router CK1 has EIGRP configured as the only routing protocol. How does EIGRPrespond if there is no feasible successor route to a destination network and thesuccessor route fails?A.
It immediately sends its entire routing table to its neighbors.B. EIGRP sends a Hello packet to the DR to inform it of the route failure.C. It automatically forwards traffic to a fallback default route until a successor route isfound.D. It sends queries out to neighbors until a new successor route is found.E. It places the route in holddown until LSA updates inform it of a new route to thenetwork.F. None of the aboveAnswer: DExplanation:EIGRP will send queries for successor if it can't find a path to destination (if no feasiblesuccessors already exist).QUESTION 538:EIGRP is configured on router CK1 . What does this router do if it has no EIGRPActualtests.com - The Power of Knowing640-802feasible successor route to a destination network and the successor route to thatdestination network is inactive status?A.
It routes all traffic that is addresses to the destination network to the interfaceindicates in the routing table.B. It sends a copy of its neighbor table to all adjacent routers.C. It sends a multicast query packet to all adjacent neighbors requesting available routingpaths to the destination network.D. It broadcasts Hello packets to all routers in the network to re-establish neighboradjacencies.E. None of the aboveAnswer: CExplanation:When the primary route is not available, EIGRP immediately uses the feasible successoras the backup route. This shortens convergence time.
Now, if the primary route is goneand no feasible successor is available, the route is in active state. The only way forEIGRP to converge quickly is to query its neighbors about the unavailable route. If theneighbor doesn't know the status of the route, the neighbor asks its neighbors, and so on,until the edge of the network is reached. The query stops if one of the following occurs:All queries are answered from all the neighbors.The end of network is reached.The lost route is unknown to the neighbors.Reference:http://www.ciscopress.com/articles/article.asp?p=27839&rl=1QUESTION 539:As a network administrator, you use a telnet program often. What are twocharacteristics of Telnet? (Choose two.)A.
It is no longer supported on Cisco network devicesB. It is more secure than SSHC. It requires that the destination device be configured to support Telnet connectionsD. It requires an enterprise license in order to be implementedE. It sends data in clear and text formatAnswer: C, EQUESTION 540:Which of the following IOS commands could you use to troubleshoot a routerconnectivity problem on an IP network? (Select all valid answers)Actualtests.com - The Power of Knowing640-802A.
show ip routeB. ipconfigC. tracertD. show interfacesE. tracerouteF. pingG. All of the aboveAnswer: A, D, E, FExplanation:A. The show ip route command displays the IP route table.D. The show interfaces EXEC command to display statistics for all interfaces configuredon the router or access server.E. Traceroute is a valid router command, used to trace the path to a destination, andprovide the latency associated with each hop.F. The ping command tests connectivity to a remote node.Incorrect Answers:B, C. These are commands used on PC hosts. They are invalid router commands.QUESTION 541:What IOS command verifies connectivity between two hosts on the Certkillernetwork by sending and receiving ICMP echo messages?A.
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