15 04 2014
Latest 2014 Pass4sure and Lead2pass Cisco 642-902 Practice Tests (61-70)
QUESTION 61
What is a key benefit of using a GRE tunnel to provide connectivity between branch offices and headquarters? Select the best response.
A. authentication, integrity checking, and confidentiality
B. less overhead
C. dynamic routing over the tunnel
D. granular QoS support
E. open standard
F. scalability
Answer: C
Explanation:
Generic routing encapsulation. Tunneling protocol developed by Cisco that can encapsulate a wide variety of protocol packet types inside IP tunnels, creating a virtual point-to-point link to Cisco routers at remote points over an IP internetwork.
QUESTION 62
You have implemented mutual route redistribution between OSPF and EIGRP on a border router. When checking the routing table on one of the OSPF routers within the OSPF routing domain, you are seeing some, but not all of the expected routes.
Which two things should you verify to troubleshoot this problem? (Choose two.)
A. The border router is using a proper seed metric for OSPF.
B. The border router is using a proper seed metric for EIGRP.
C. The administrative distance is set for OSPF and EIGRP.
D. The missing EIGRP routes are present in the routing table of the border router.
E. The subnet keyword on the border router in the redistribute EIGRP command.
Answer: DE
Explanation:
When troubleshooting EIGRP routes being distributed into OSPF, the first item to check is that the missing EIGRP routes are in fact on the router performing the redistribution (border router). If not, the routes cannot be redistributed into OSPF and troubleshooting should occur within the EIGRP AS.
The second step is to verify that the subnets keyword has been appended to the redistribute eigrp statement under the OSPF routing process. The question mentions that the networks being redistributed are using a /28 mask, with implies that the networksare actually subnets not assigned to classful boundaries.
OSPF will only redistribute classful networks by default. The keyword "subnets" allows subnets to also be be redistributed into OSPF (not merely classful routes).
QUESTION 63
Which DSL encapsulation method requires client software running on the end-user PC that is directly connected to a DSL modem? Select the best response.
A. PPPoA
B. PPPoE
C. PPP
D. L2TP
E. ATM
Answer: B
Explanation:
http://www.vicomsoft.com/learning-center/pppoe/
QUESTION 64
What is the purpose of configuring the router as a PPPoE client? Select the best response.
A. to provide VPN access over L2TP
B. to enable PPP session from the router to the termination device at the headend for metro Ethernet
connectivity
C. for DSL connectivity and removing the need for the end-user PC to run the PPPoE client software
D. for connecting the router to a cable modem, which bridges the Ethernet frames from the router to
the cable modem termination system
Answer: C
Explanation:
DSL Technology used PPPoE protocol (service provide end) and user end required to be used same Protcol running as client to communicate with it
QUESTION 65
What is the international standard for transmitting data over a cable system? Select the best response.
A. PPPoE
B. DOCSIS
C. CMTS
D. AAL5
Answer: B
Explanation:
http://www.cablelabs.com/news/pr/1998/1998_03_19.html (see first para)
QUESTION 66
Under which circumstance will a branch ISR router contain interface vlan configurations? Select the best response.
A. performing inter-VLAN routing
B. performing 802.1Q trunking
C. performing ISL trunking
D. Ethernet Switch Module installed
E. ADSL WIC installed
F. running Call Manager Express
Answer: D
Explanation:
In smaller offices, a single ISR may be used for a both remote connectivity and inter-VLAN routing. In that case, know that an Ethernet Switch Module would be required for the ISR router
QUESTION 67
Which two statements about route redistribution when implementing OSPF are true? (Choose two.)
A. Routes learned using any IP routing protocol can only be redistributed into non IP routing protocols. .
B. OSPF can import routes learned using EIGRP, RIP, and IS-IS.
C. OSPF routes cannot be exported into EIGRP, RIP, and IS-IS.
D. At the interdomain level, OSPF cannot import routes learned using BGP.
E. OSPF routes can be exported into BGP.
Answer: BE
Explanation:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/software/release/12.2_55_se /configuration/guide/swiprout.html (See configuring OSPF)
QUESTION 68
Which two routing interface parameters are supported in OSPF implementations? (Choose two.)
A. retransmit-interval
B. dead-interval
C. stub area
D. virtual link
E. NSSA area
Answer: AB
Explanation:
When OSPF sends an advertisement to an adjacent router, it expects to receive an acknowledgment from that neighbor. If no acknowledgment is received, the router will retransmit the advertisement to its neighbor. The retransmit-interval timer controls the number of seconds between retransmissions. To edit the retransmit-interval, use the "ip ospf retransmit-interval seconds" in interface configuration mode.
Dead-interval is the number of seconds without hello packets before an adjacency is declared down. To edit the dead-interval, use the "ip ospf dead-interval seconds" in interface configuration mode.
Other answers are not correct because they are not interface parameters.
QUESTION 69
ACME Rocket Sleds is growing, and so is their network. They have determined that they can no longer continue using static routes and must implement a dynamic routing protocol. They want to have data use multiple paths to the destinations, even if the paths are not equal cost.
Which routing protocol has the ability to do this? Select the best response.
A. EIGRP
B. OSPF
C. RIPv1
D. RIPv2
E. BGP
F. IS-IS
Answer: A
Explanation:
Unlike most internal routing protocols, EIGRP has a really cool feature that allows you to share the load of your traffic across multiple links and not just links that have the same cost values. EIGRP allows you to make full use of your redundant links that could be in place just to have for back up but you are paying out a lot of money just to sit there and do nothing. EIGRP makes it easy for us the network engineers to make this happen. Before jumping in the in’s and out lets run through a few things first when it comes to EIGRP Load Sharing, also refereed to as Load Balancing sometimes.
QUESTION 70
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: 481/444
Updates sent/received: 41/32
Queries sent/received: 5/1
Replies sent/received: 1/4
Acks sent/received: 21/25
Input queue high water mark 2, 0 drops
SIA-Queries sent/received: 0/0
SIA-Replies sent/received: 0/0
Approximately 25 minutes later, you issue the same command again. The following output is shown:
RouterC#show ip eigrp traffic
IP-EIGRP Traffic Statistics for process 1
Hellos sent/received: 1057/1020
Updates sent/received: 41/32
Queries sent/received: 5/1
Replies sent/received: 1/4
Acks sent/received: 21/25
Input queue high water mark 2, 0 drops
SIA-Queries sent/received: 0/0
SIA-Replies sent/received: 0/0
Approximately 25 minutes later, you issue the same command a third time. The following output is shown:
RouterC#show ip eigrp traffic
IP-EIGRP Traffic Statistics for process 1
Hellos sent/received: 1754/1717
Updates sent/received: 41/32
Queries sent/received: 5/1
Replies sent/received: 1/4
Acks sent/received: 21/25
Input queue high water mark 2, 0 drops
SIA-Queries sent/received: 0/0
SIA-Replies sent/received: 0/0
What can you conclude about this network? Select the best response.
A. The network has been stable for at least the last 45 minutes.
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 A 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: A
Explanation:
In three times using the command, the "Queries sent/received" & "Replies sent/received" are still the same -> the network is stable.
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