Tips to Pass 642-883 Exam (31 to 40)

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Product Description:
Exam Number/Code: 642-883
Exam name: Deploying Cisco Service Provider Network Routing (SPROUTE)
n questions with full explanations
Certification: Cisco Certification
Last updated on Global synchronizing

Free Certification Real IT 642-883 Exam pdf Collection

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2016 Jun 642-883 torrent

Q31. RAG DROP 

Answer: 


Q32. Which option is the minimum required configuration to enable PIM on a Cisco IOS XR router interface? 

A. router pim address-family ipv4 interface GigabitEthernet0/0/0/0 

B. router pim interface GigabitEthernet0/0/0/0 address-family ipv4 enable 

C. router pim address-family ipv4 interface GigabitEthernet0/0/0/0 enable 

D. router pim interface GigabitEthernet0/0/0/0 enable 

E. router pim address-family ipv4 interface GigabitEthernet0/0/0/0 address-family ipv4 enable 

Answer: D 


Q33. What is recursive lookup in BGP and how does it work? 

A. The router looks up the EBGP route and the EBGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the EBGP next hop using the IBGP. 

B. The router looks up the IBGP route and the IBGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the IBGP next hop using the EBGP. 

C. The router looks up the BGP route and the BGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the BGP next hop using the IGP. 

D. The router looks up the route and the next hop to reach a destination in the remote AS using the IGP. Then the router looks up the route to reach the next hop using BGP. 

E. The router perform three routing lookups to determine the route to reach a destination in the remote AS. The first lookup is done using EBGP, the second lookup is done using IBGP, and the third lookup is done using the IGP. 

Answer: C 

Explanation: 

A few different approaches are available to deal with iBGP and synchronization. We may turn on the synchronization option on our routers and wait for the IGP to have a route for the destination before it’s advertised to peers. Another option is to simply use a full mesh, so that iBGP convergence isn’t an issue. Clearly that isn’t going to happen when a network’s core needs to scale: it will implement something like reflectors that cause iBGP’s full mesh to be broken. The real alternative, if you don’t enable synchronization, is to use route recursion. A recursive route lookup uses the BGP next-hop attribute to actually make a different route lookup. The IGP can use the destination network instead of the AS-path to determine where it gets sent. Even if the iBGP hasn’t converged, the routers will still know how to get to that network, since it will exist in the router it was advertised from, who will know the next-hop. 


Q34. Which option describes how.an engineer must configure route summarization on a Cisco IOS XE OSPF-enabled network of routers? 

A. area range command under the router OSPF process of the ABR 

B. area range command under the router OSPF process of the router wanting to originate the summary route from 

C. summary-address command under the OSPF process of the ABR 

D. summary-address command under the OSPF process of the router wanting to originate the summary route from 

E. network statement for the aggregate address under the router OSPF process on the ABR 

F. network statement for the aggregate address under the router OSPF process of the router wanting to originate the summary route from 

Answer: A 


Q35. In Cisco IOS and Cisco IOS XE Software images, when redistributing routes from other routing protocols into OSPF, what is a common reason why some of the routes might not be redistributed into OSPF? 

A. The OSPF external metric type (E1 or E2) is not defined. 

B. The OSPF seed metric is not defined. 

C. The OSPF level (Level 1, Level 2, or Level-1-2) to which the routes will be redistributed into is not defined. 

D. The subnets option in the redistribute command is missing. 

Answer: D 


642-883-exam

Renewal 642-883 exam answers:

Q36. There are how many IS-IS area(s) defined in this network Scenario? 

A. 1 

B. 2 

C. 3 

D. 4 Answer: C 

Explanation: #show clns 


Q37. Which option describes the configuration for a Cisco IOS XR OSPF router to give it the highest chances of becoming DR? 

A. ip ospf priority 0 under the OSPF interface statement 

B. ip ospf priority 0 under the OSPF area statement 

C. ip ospf priority 255 under the OSPF interface statement 

D. ip ospf priority 255 under the OSPF area statement 

E. Leave priority unchanged, but assign a high-numbered IP address on a loopback interface. 

F. Leave priority unchanged, but assign a high-numbered IP address on any physical interface. 

Answer: C 


Q38. Which reserved AS number or range of numbers is used for backward compatibility between old BGP peers using 16-bit AS number and new BGP peers using 32-bit AS number? 

A. AS 65001 to 65535 

B. AS 65512 to 65535 

C. AS 12345 

D. AS 23456 

E. AS 64001 

Answer: D 

Explanation: 

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6554/ps6599/4byte_asnios. pdf New Reserved AS# AS_TRANS = AS #23456 2-byte placeholder for a 4-byte AS number Used for backward compatibility between OLD and NEW BGP speakers 


Q39. RAG DROP 

Answer: 


Q40. A network engineer wants to test a path between any two points in the network for multicast traffic to identify congestion points in the network. Which command in a Cisco IOS XE router shows multicast traffic drops? 

A. mstat 

B. mtrace 

C. mrinfo 

D. ping 

Answer: A 



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