Cisco 642-883 Online Practice Questions and Exam Preparation

Cisco 642-883 Online Questions & Answers

• Question 11:

  

  

  Which router has the su 10.5.10.0/24 [20/115] entry pointing to NullO in its routing table and why? (Choose two.)

  A. CE5
  B. PE5
  C. PE6
  D. The router is summarizing 10.5.10.1/32 into 10.5.10.0/24
  E. The router is suppressing the 10.5.10.0/24 route
  F. The L2/L1 IS-IS router is blocking the 10.5.10.0/24 interarea route to the L1-only router
  D. The router is summarizing 10.5.10.1/32 into 10.5.10.0/24
  F. The L2/L1 IS-IS router is blocking the 10.5.10.0/24 interarea route to the L1-only router

  ---

  # show clns route

• Question 12:

  In a Cisco IOS XR OSPF NSF operation, which option is the result of a segment without NSF-capable peers?

  A. NSF is disabled on all segmentson any linecard that has a non-NSF-capable neighbor.
  B. NSF capabilities for that segment are disabled.
  C. NSF operates in unidirectional mode for that segment.
  D. NSF is disabled globally on the router.
  B. NSF capabilities for that segment are disabled.

• Question 13:

  Refer to the exhibit.

  

  R1 and XR2 cannot establish OSPF adjacency. Which option is the root cause of this issue?

  A. stub flag mismatch
  B. mismatched passwords
  C. process ID mismatch
  D. mismatched authentication types
  E. MTU mismatch
  D. mismatched authentication types

• Question 14:

  Refer to the exhibit.

  

  R2 does not have R1 1.1.1.1/32 subnet in its BGP table. Which issue can be causing this problem?

  A. There is no route-reflector configuration in AS 100.
  B. IPv4 address-family isnot enabled on R1.
  C. R2 does not have next-hop-self for a XR4 iBGP session.
  D. XR4 drops any update coming from R1 because there is no RPL policy applied.
  D. XR4 drops any update coming from R1 because there is no RPL policy applied.

• Question 15:

  Refer to the exhibit.

  

  Which Cisco IOS XR configuration is missing to complete the configuration task of enabling BFD with only the OSPF peer over the gi0/3/0/1 interface in area 0?

  A. bfd fast-detect also needs to be enabled globally under router ospf 100. RP/0/RSP0/CPU0:P1(config-ospf)#bfd fast-detect
  B. bfd fast-detect also needs to be enabled for the OSPF area under area 0. RP/0/RSP0/CPU0:P1(config-ospf-ar)#bfd fast-detect
  C. bfd fast-detect also needs to be enabled for the OSPF interface under area 0 interface gi0/3/0/1. RP/0/RSP0/CPU0:P1(config-ospf-ar-if)#bfd fast-detect
  D. bfd fast-detect also needs to be enabled globally on the router. RP/0/RSP0/CPU0:P1(config#bfd fast-detect
  E. bfd fast-detect also needs to be enabled on the gi0/3/0/1 interface under interface gi0/3/0/1. RP/0/RSP0/CPU0:P1(config-if)#bfd fast-detect
  C. bfd fast-detect also needs to be enabled for the OSPF interface under area 0 interface gi0/3/0/1. RP/0/RSP0/CPU0:P1(config-ospf-ar-if)#bfd fast-detect

  ---

  bfd fast-detect

  To enable Bidirectional Forwarding Detection (BFD) to detect failures in the path between adjacent forwarding engines, use the bfd fast-detect command in the appropriate configuration mode. To return the software to the default state in which BFD is not enabled, use the no form of this command.

  bfd fast-detect [disable | ipv4] no bfd fast-detect

• Question 16:

  Drag the list of OSPF route type on the left to match the correct OSPF area type on the right. Not all options on the left are used.

  Select and Place:

  

  

• Question 17:

  What are two characteristics of the multihomed customers to service providers connection option? (Choose two.)

  A. Multihomed customers must use a private AS number.
  B. The traffic load can be shared for different destination networks between service providers.
  C. Multihomed customers must receive a full routing table from the service providers.
  D. The routing methodology must be capable of reacting to dynamic changes. BGP is used to achieve this flexibility.
  E. Multihomed customers must use a provider-assigned address space.
  B. The traffic load can be shared for different destination networks between service providers.
  D. The routing methodology must be capable of reacting to dynamic changes. BGP is used to achieve this flexibility.

• Question 18:

  When configuring Cisco IOS route maps, which command allows the route map processing to jump to another statement instead of exiting?

  A. jump
  B. next
  C. set
  D. continue
  E. goto
  D. continue

  ---

  Match Operations With Continue Clauses If a match clause does not exist in the route-map entry but a continue clause does, the continue clause will be automatically executed and go to the specified route-map entry. If a match clause exists in a route-map entry, the continue clause is executed only when a successful match occurs. When a successful match occurs and a continue clause exists, the route map executes the set clauses and then goes to the specified route-map entry. If the next route map contains a continue clause, the route map will execute the continue clause if a successful match occurs. If a continue clause does not exist in the next route map, the route map will be evaluated normally. If a continue clause exists in the next route map but a match does not occur, the route map will not continue and will "fall through" to the next sequence number if one exists.

  Set Operations With Continue Clauses Set clauses are saved during the match clause evaluation process and executed after the route-map evaluation is completed. The set clauses are evaluated and executed in the order in which they were configured. Set clauses are only executed after a successful match occurs, unless the route map does not contain a match clause. The continue statement proceeds to the specified route-map entry only after configured set actions are performed. If a set action occurs in the first route map and then the same set action occurs again, with a different value, in a subsequent route map entry, the last set action may override any previous set actions that were configured with the same set command unless the set command permits more than one value. For example, the set as-path pretend command permits more than one autonomous system number to be configured.

• Question 19:

  What is the default OSPF seed metric and type?

  A. 10 and E1
  B. 10 and E2
  C. 20 and E1
  D. 20 and E2
  E. 0 and E1
  F. 0 and E2
  D. 20 and E2

• Question 20:

  How can you prevent multihomed customers with connections to two service providers from acting as a transit AS?

  A. Enable BGP synchronization on all the customer routers
  B. Use MED to influence the inbound traffic from the ISPs
  C. Use static routing to the ISPs
  D. Use an AS-path access-list to filter the BGP updates to the ISPs
  E. Use conditional advertisements when sending BGP updates to the ISPs
  D. Use an AS-path access-list to filter the BGP updates to the ISPs