ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 56
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Based on the information shownabove, correctly identify the current OSPF router ID for Router Certkiller 3.A. 220.173.149.10B. 208.149.23.194C. 208.149.23.162D. 190.172.32.10E. None of the aboveAnswer: BQUESTION 498:The interface status for router Certkiller 3 is as follows:Prior to the command shown above, you had configured OSPF with the command:Certkiller 3(config-router)# network 192.168.12.64 0.0.0.63 area 0After completing the configuration, you now discover that not all the interfaces areActualtests.com - The Power of Knowing640-802participating in OSPF. Based on the information shown above, which three of theinterfaces will participate in OSPF according to this configuration statement?(Choose three)A. Serial0/1.104B.
Serial0/1.102C. Serial0/0D. Serial0/1.103E. FastEthernet0 /1F. FastEthernet0 /0Answer: B, C, EQUESTION 499:Which one of the following privileged EXEC mode IOS show commands will displaythe state of the OSPF DR/BDR (designated router / backup designated router)election process?A. CK1 # show ip ospf interfaceB.
CK1 # show ip ospf priorityC. CK1 # show ospf neighbor detailD. CK1 # show ospf processesE. CK1 # show ospf neighbor stateF. None of the aboveAnswer: AExplanation:This command will display the router ID of both the DR and the BDR on the networksegment that the particular interface is connected to.Example:Router1#show ip ospf interface ethernet 0Ethernet0 is up, line protocol is upInternet Address10.10.10.1/24, Area 0Process ID 1, Router ID 192.168.45.1, Network Type BROADCAST, Cost:10 Transmit Delay is 1 sec, State BDR, Priority 1Designated Router (ID) 172.16.10.1, Interfaceaddress 10.10.10.2 Backup Designated router (ID) 192.168.45.1, Interface address 10.10.10.1Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:06Index 1/1, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 2, maximum is 2Last flood scan time is 0 msec, maximum is 4 msec Neighbor Count is 1, Adjacent neighborcount is 1Adjacent with neighbor 172.16.10.1 (Designated Router) Suppress hello for 0neighbor(s)QUESTION 500:Actualtests.com - The Power of Knowing640-802On your OSPF network, routers CK1 and CK2 belong to the same Ethernetnetwork.
However, they are unable to establish an adjacency over this link. Whiletroubleshooting this problem, you issue the "show ip ospf interface Ethernet 0"command on each router. The output from these commands is displayed below:CK1 : Ethernet is up, line protocol is upInternet address 192.168.1.2/24, Area 0Process ID 1, Router ID 192.168.31.33, Network Type BROADCAST, Cost: 10Transmit Delay is 1 sec, State DR, Priority 1Designated Router (ID) 192.168.31.33, Interface address 192.168.1.2No backup designated router on this networkTime intervals configured, Hello 5, Dead 20, Wait 20, Retransmit 5CK2 : Ethernet0 is up, line protocol is upInternet address 192.168.1.1/24, Area 0Process ID 2, Router ID 192.168.31.11, Network Type BROADCAST, Cost: 10Transmit Delay is 1 sec, State DR, Priority 1Designated Router (ID) 192.168.31.11, Interface address 192.168.1.1No backup designated router on this networkTimer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5What is the underlying cause of the routers failing to become adjacent?A.
The OSPF area is misconfigured.B. The priority on CK2 should be set lower.C. The cost on CK2 should be set lower.D. The hello and dead timers are misconfigured.E. You need to add a backup designated router to the network.F. The OSPF process ID numbers do not match.Answer: DExplanation:OSPF routers must have the same hello intervals and the same dead intervals to exchangeinformation.
By default, the dead interval is four times the value of the hello interval.This means that a router has four chances to send a hello packet before being declareddead.On broadcast OSPF networks, the default hello interval is 10 seconds and the defaultdead interval is 40 seconds. On nonbroadcast networks, the default hello interval is 30seconds and the default dead interval is 120 seconds. These default values result inefficient OSPF operation and seldom need to be modified. As shown in the output, thehello timer on router CK1 was changed to 5 seconds, with the dead timer being set to 20seconds.Incorrect Answers:A. Both routers are configured to be in area 0.B.
In this example the adjacency should come up regardless of which one was theDR/BRD. Therefore, setting the priority on one router will not solve this problem.C. This will not solve the adjacency issue.Actualtests.com - The Power of Knowing640-802E. Only the DR is absolutely required on the Ethernet subnet, not the BDR.F.
Unlike other protocols, the routing process ID's do not necessarily need to match inOSPF for routing to work.QUESTION 501:Router CK1 is being installed. You wish to add this router to your existing OSPFnetwork. In doing so, you configure the following:CK1 (config)# router ospf 1CK1 (config-router)# network 10.10.10.0 255.255.255.0 area 0After making this change, you notice that the networks attached to CK1 are notbeing learned by the other OSPF routers. What could be the cause of this?A.
The AS is not correctly configuredB. The network subnet mask is incorrectly configuredC. The network wildcard mask is configured incorrectlyD. The network number is not correctly configuredE. The process id is configured incorrectlyF. None of the aboveAnswer: CExplanation:The network command specifies the IP address (10.10.10.0) followed by the wildcardmask (not the subnet mask) and the area that is to be associated with the OSPF addressrange (in this case, area 0).
The wildcard mask indicates in binary how much of the IPaddress much be matched with 0s indicating that the bits must match and 1 indicating thatthey may vary. Thus 0.0.0.255 or 00000000.00000000.00000000.11111111 indicates thatany bit in the last octet can vary while all bits in the first 3 octets must match the networkaddress (in other words, 10.10.10.xx)Incorrect Answers:A. Here the process ID is 99, which is valid.B.
Area 0 is the backbone area, so configuring the network to be in area 0 should beacceptable.D. This is not the problem, assuming that all 10.X.X.X networks are to be configured forOSPF.E. The AS number, as called the process ID in OSPF is 99.F. OSPF uses wildcard masks, not the usual subnet masksQUESTION 502:The Certkiller OSPF Backbone network is displayed below:Actualtests.com - The Power of Knowing640-802Certkiller 1 is unable to establish an OSPF neighbor relationship withCertkiller 3. What are possible reasons for this problem? (Choose Two).A. All of the routers need to be configured for backbone Area1.B.
Certkiller 1 and Certkiller 2 are the DR and BDR, so OSPF will not establishneighbor adjacency with Certkiller 3C. A static route has been configured from Certkiller 1 to Certkiller 3 and preventsthe neighbor adjacency from being established.D. The hello and dead interval timers are not set to the same values on Certkiller 1 andCertkiller 3.E. EIGRP is also configured on these routers with a lower administrative distance.F. Certkiller 1 and Certkiller 3 are configured in different areas.Answer: D, FExplanation:In order for two OSPF routers to establish a neighbor adjacency, they must agree on anumber of things, including the hello intervals, dead intervals, and the area ID's.Although a router can be configured for multiple OSPF areas, a neighbor relationshipwill only be built on interfaces that share the same area.QUESTION 503:The Certkiller OSPF network is shown below:Actualtests.com - The Power of Knowing640-802Based on the output from the show ip ospf neighbor command on CK-2, what musta network administrator do to ensure that CK-2 will always be the DR and CK-3will never be the DR or BDR for OSPF area 0? (Choose three.)A.
Set the CK-3 OSPF priority to 0 on the serial interface.B. Change the CK-2 FastEthernet IP address to 192.168.0.27.C. Set the CK-2 OSPF priority to 255 on the FastEthernet interface.D. Change the CK-3 FastEthernet IP address to 192.168.0.27.E. Set the CK-3 OSPF priority to 0 on the FastEthernet interface.F. Set the CK-1 OSPF priority to 0 on the FastEthernet interface.Answer: C, E, FExplanation:In OSPF, the DR is the router responsible for making adjacencies with all neighbors on a multiaccess network,such asEthernet or FDDI. The DR represents the multiaccess network, in that it ensures that every router on the linkhas thesame topology database.The BDR is the backup to the designated router (DR), in case the DR fails.
The BDR performs none of the DRfunctions while the DR is operating correctly.Router(config-if)#ip ospf priority numberThe number in the priority command can be set between 0-255, where the higher the number, the greaterthe likelihood that this router will be selected as the DR.To determine manually which router will be the DR, it is necessary to set the priority of the router. A routerinterface can have a priority of 0 to 255. The value of 0 means that the router cannot be a DR or BDR;otherwise, the higher the priority, the more favorable the chances are of winning the election. If there ismore than one router on the segment with the same priority level, the election process picks the router withthe highest router ID. The default priority on a Cisco router is 1.If Priority value is same then goes to the highest IP address assigned in loopback interface then anyinterface.Actualtests.com - The Power of Knowing640-802QUESTION 504:Referring to the Certkiller Border router shown below, what can be concluded fromthe output of this debug command?Exhibit:A.
The output represents normal OSPF operation.B. The OSPF router connected to interface Serial0/1 has NOT formed a neighborrelationship with the Border router.C. The interfaces of two OSPF routers connected to the Border router are in the samesubnet.D. A router is connected to interface Serial0/3 of the Border router. The OSPF router IDof the connected router is the IP address of the connected interface.E.
None of the aboveAnswer: BExplanation:This "debug ip ospf events" output shown might appear if any of the following situationsoccurs:1. The IP subnet masks for routers on the same network do not match.2. The OSPF hello interval for the router does not match that configured for a neighbor.3. The OSPF dead interval for the router does not match that configured for a neighbor.If a router configured for OSPF routing is not seeing an OSPF neighbor on an attachednetwork, perform the following tasks:1.
Make sure that both routers have been configured with the same IP mask, OSPF hellointerval, and OSPF dead interval.2. Make sure that both neighbors are part of the same area type.QUESTION 505:Actualtests.com - The Power of Knowing640-802The Certkiller OSPF network is displayed below:The internetwork infrastructure of Certkiller consists of a single OSPF area asshown in the graphic.
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