16 04 2014
Latest 2014 Pass4sure and Lead2pass Cisco 642-902 Practice Tests (71-80)
QUESTION 71
After implementing EIGRP on your network, you issue the show ip eigrp traffic command on router C. The following output is shown:
RouterC#show ip eigrp traffic
IP-EIGRP Traffic Statistics for process 1
Hellos sent/received: 2112/2076
Updates sent/received: 47/38
Queries sent/received: 5/3
Replies sent/received: 3/4
Acks sent/received: 29/33
Input queue high water mark 2, 0 drops
SIA-Queries sent/received: 0/0
SIA-Replies sent/received: 0/0
Moments later, you issue the same command a second time and the following output is shown:
RouterC#show ip eigrp traffic
IP-EIGRP Traffic Statistics for process 1
Hellos sent/received: 2139/2104
Updates sent/received: 50/39
Queries sent/received: 5/4
Replies sent/received: 4/4
Acks sent/received: 31/37
Input queue high water mark 2, 0 drops
SIA-Queries sent/received: 0/0
SIA-Replies sent/received: 0/0
Moments later, you issue the same command a third time and the following output is shown:
RouterC#show ip eigrp traffic
IP-EIGRP Traffic Statistics for process 1
Hellos sent/received: 2162/2126
Updates sent/received: 53/42
Queries sent/received: 5/5
Replies sent/received: 5/4
Acks sent/received: 35/41
Input queue high water mark 2, 0 drops
SIA-Queries sent/received: 0/0
SIA-Replies sent/received: 0/0
What information can you determine about this network? Select the best response.
A. The network is stable..
B. There is a flapping link or interface, and router C knows an alternate path to the network.
C. There is a flapping link or interface, and router C does not know an alternate path to the network.
D. EIGRP is not working correctly on router C.
E. There is not enough information to make a determination.
Answer: B
Explanation:
We notice that the "Queries received" number is increased so router C has been asked for a route. The "Replies sent" number is also increased -> router C knows an alternate path to the network.
QUESTION 72
OSPF is enabled on router A. You execute the following command on router A and receive the accompanying output:
RouterA#ping 224.0.0.5 repeat 1
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.0.0.5, timeout is 2 seconds:
Reply to request 0 from 10.100.100.1, 4 ms
10.100.100.1 is the IP address of a loopback interface on router A. What can you conclude about router A? Select the best response.
A. Only the router A loopback interface is participating in the OSPF routing process.
B. None of the router A interfaces are participating in the OSPF routing process.
C. Router A is using the loopback interface IP address as its OSPF router ID.
D. Router A does not have any reachable OSPF neighbors.
Answer: D
Explanation:
The 224.0.0.5 address is the multicast for OSPF routers. Therefore when you ping to this address all OSPF routers will reply but from the output we learn that only the local router responded -> Router A does not have any reachable OSPF neighbors.
QUESTION 73
To make OSPF area 4 totally stubby, the following command was issued on the ABR in router configuration mode: area 4 stub.
Which two things need to be done to finish making area 4 a totally stubby area? (Choose two.)
A. Apply the area 4 stub command to all routers in the area.
B. On the ABR, use the area 4 stub command with the no-summary keyword.
C. On the ABR, specify a default cost for the area with the area default-cost command.
D. On the ABR, use the default-information originates command to inject a default route into area 4.
E. Use the auto-cost command on each router in the area to automatically determine the cost to
other OSPF areas.
Answer: AB
Explanation:
To make an area "totally stubby" we must apply the "area area-id stub no-summary" command on the ABR and area area-id stub" commands to all other routers in that area. Note: The ABR in a totally stubby area does not create Type 3 summary LSA. It only creates a default route to outside destinations.
QUESTION 74
Which three statements about OSPF areas are true? (Choose three.)
A. Areas introduce a boundary on the link-state updates.
B. Areas are logical definitions specific to any given router.
C. All routers within an area have the exact link-state database.
D. The calculation of the Dijkstra algorithm on a router is limited to changes within an area.
E. The area designated router will always have a priority of 0.
Answer: ACD
Explanation:
http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.shtml (areas and border routers)
QUESTION 75
Which command displays the number of times that the OSPF Shortest Path First (SPF) algorithm has been executed? Select the best response.
A. show ip protocol
B. show ip ospf interface
C. show ip ospf
D. show ip ospf database
Answer: C
QUESTION 76
Which of the following NSAP addresses is a private, locally administered address? Select the best response.
A. 39.0f01.0002.0000.0c00.1111.00
B. 48.0f01.0002.0000.0c00.1111.00
C. 49.0004.30ac.0000.3090.c7df.00
D. 52.0f01.0002.0000.0c00.1111.00
Answer: C
Explanation:
https://sites.google.com/site/amitsciscozone/home/is-is/nsap-addresses
QUESTION 77
Given the following partial configuration for Router A:
interface serial 0
ip address 10.1.1.1 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-multipoint
router ospf 7
network 10.1.1.0 0.0.0.255 area 0
Which two statements are correct? (Choose two.)
A. DR/BDR elections do not take place.
B. The router is restricted to a hub and spoke topology.
C. The area 0 NBMA cloud is configured as more than one subnet.
D. OSPF neighbor statements are not necessary.
Answer: AD
Explanation:
In an OSPF Point-to-Multipoint environment, DB/BDR elections do not take place. The neighbor command became somewhat obsolete with the introduction of the capability to configure other network modes for the interface, regardless of the underlying physical topology. Building Scalable Cisco Networks (Cisco Press) page 130 and 181
Point-to-Multipoint Network:
Point-to-multipoint is a single interface that connects to multiple destinations. The underlying network treats the network as a series of point-to-point circuits. It replicates LSA packets for each circuit. OSPF traffic is sent as multicast. There is no DR or BDR election. This technology uses one IP subnet for all endpoints on the network.
By default, the network is considered to be a series of point-to-point interfaces. There is no need to specify neighbors, because the neighbors will see each other and simply become adjacent, with no need for the election of a DR or a BDR. Point-to-multipoint does not try to reduce adjacencies using a DR. Instead, it accepts the extra overhead of having a full set of adjacencies for the sake of stability. Point-to-multipoint forms an adjacency automatically along any PVC, which causes more overhead but is more resilient than NBMA.
QUESTION 78
When other routing protocol routes are being redistributed into OSPF, what is one of the most common problems? Select the best response.
A. missing the tag option in the redistribute command.
B. missing the subnet option in the redistribute command.
C. missing the metric option in the redistribute command.
D. misconfiguring the metric-type option in the redistribute command to type-1.
E. misconfiguring the metric-type option in the redistribute command to type-2.
Answer: B
Explanation:
The point of this question is about the redistribution of OSPF. To redistribute routes from one routing domain into another routing domain, use the redistribute command in router configuration mode. redistribute protocol [process-id] {level-1 | level-1-2 | level- 2} [as-number] [metric {metric-value | transparent}] [metric-type type-value] [match {internal | external 1 |
external 2}] [tag tag-value] [route-map map-tag] [subnets] The subnets keyword tells OSPF to redistribute all subnet routes. Without the subnets keyword, only networks that are not subnetted are redistributed by OSPF.
QUESTION 79
Given the accompanying output, which additional command is needed to redistribute IGRP into EIGRP?
Router eigrp 123
Network 10.10.10.0
No auto-summary
!
Router igrp 123
Network 172.16.0.0
Network 172.17.0.0
Select the best response.
A. Under the router igrp mode add redistribute eigrp 123
B. Under the router eigrp mode add redistribute igrp 123
C. Under the router eigrp mode add redistribute igrp 123 subnets
D. None, EIGRP and IGRP are automatically redistributed in this instance.
Answer: D
Explanation:
The point of this question is redistribute IGRP into EIGRP. When redistributing IGRP into EIGRP, there is a feature that they are automatically redistributed if they have same autonomous system number; in opposite, they need to manually redistributed if they have different autonomous system number.
QUESTION 80
The Dev-1 and Dev-3 routers are OSPF neighbors over the Ethernet 0/0 connection. Based on the show ip ospf neighbor output from the Dev-1 and Dev-3 routers, which statement is true? Select the best response.
A. Dev-1 is the DR because it has a higher OSPF router priority.
B. Dev-1 is the DR because it has a lower OSPF router ID.
C. Dev-3 is the DR because it has a higher OSPF router priority.
D. Dev-3 is the DR because it has a lower OSPF router ID.
E. Both Dev-1 and Dev-3 are using the default OSPF router priority.
Answer: A
Explanation:
The output shown above displays information about the neighbors, so from Dev-3 we see that the priority of Dev-1 is 2, and that Dev-1 is the DR. From Dev-1 we can see that its neighbor (Dev-3) is the BDR and has an OSPF priority of 1.
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