Cisco 642-883 Online Practice Questions and Exam Preparation

Cisco 642-883 Online Questions & Answers

• Question 61:

  Drag the router on the left to match the most optimal IS-IS router type it should use on the right.

  Select and Place:

  

  

• Question 62:

  Which of the following is used by an IS-IS router to detect other IS-IS neighbor routers and to form adjacencies?

  A. ESH
  B. ISH
  C. IIH
  D. PSNP
  E. CSNP
  C. IIH

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  ISIS actually features three different hello types An ES Hello (ESH) is send by all End Systems, and all IS devices listen for this Hello An IS Hello (ISH) announces the presence of an IS - An IS Hello is sent by all IS devices, and End Systems listen for these hellos Finally, an IS-to-IS Hello (IIH) is used by an IS to discover other ISes and to form adjacencies with them A router will send an IIH to another router on the link to form or maintain an adjacency, but it will still send an ISH as well in case there are end systems located on that segment

• Question 63:

  The Cisco IOS XE Software summary-address router IS-IS configuration command can be used to send a summarized route into which IS-IS hierarchy?

  A. Level 1 only
  B. Level 2 only
  C. Level-1-2 only
  D. Level 1 or Level 2 or Level-1-2
  D. Level 1 or Level 2 or Level-1-2

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  C:\Documents and Settings\user-nwz\Desktop\1.JPG

• Question 64:

  Drag the regular expression special character used in AS-Path access-list configuration on the left to match the correct description on the right.

  Select and Place:

  

  

• Question 65:

  Refer to the exhibit.

  

  Assume that XR2 and R3 have been configured correctly for OSPF area 0. Which command is needed to configure XR2 as an ABR between area 0 and area 1?

  A. router ospf 1address-family ipv4interface GigabitEthernet0/0/0/1area 1
  B. router ospf 1area 1interface GigabitEthernet0/0/0/1
  C. router ospf 1area 1network 10.10.12.0 0.0.0.255
  D. router ospf 1interface GigabitEthernet0/0/0/1area 1
  B. router ospf 1area 1interface GigabitEthernet0/0/0/1

• Question 66:

  Which two methods implement high availability in OSPF on Cisco IOS XR? (Choose two.)

  A. NSF
  B. NSR
  C. BFD
  D. fast hellos
  E. sham-links
  A. NSF
  B. NSR

• Question 67:

  A static default route has been inserted into the configuration of a Cisco IOS XE router. Which option redistributes the route into the local OSPF process?

  A. router ospf 1 redistribute static subnets
  B. router ospf 1 redistribute static
  C. router ospf 1 redistribute static subnets default-information originate always
  D. router ospf 1 network 0.0.0.0 area 0 redistribute static subnets
  C. router ospf 1 redistribute static subnets default-information originate always

• Question 68:

  What are two purposes of the BGP scan-time command? (Choose two.)

  A. to tune the BGP process which walks the BGP table and confirms the reachability of next hops
  B. to allow faster detection of downed BGP peers
  C. to improve BGP convergence time
  D. to tune the BGP update interval
  E. to decrease the effects of unstable routes by increasing the route suppression time
  A. to tune the BGP process which walks the BGP table and confirms the reachability of next hops
  C. to improve BGP convergence time

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  http://www.networkers-online.com/blog/2008/12/bgp-performance-tunning-convergence- stability-scalabilityand-nsf-part-2/

  Background BGP scanner

  It is responsible for BGP housekeeping by scanning both the BGP RIB and the IP RIB and cleaning and sorting things out.

  BGP monitors the next hop of the installed routes to verify next-hop reachability and to select, install, and validate the BGP best path. By default, the BGP scanner polls the RIB for this information every 60 seconds.

  During the 60 second time period between scan cycles, IGP instabilities or other network failures can cause temporarily black holes and routing loops.

  NOTE With Cisco IOS the default timer is 60 seconds for the IPv4 address family and 15 seconds for the

  VPNv4 address family in order to optimize the VPNs routing table convergence. This timer can be controlled via the following command:

  Router(config-router)#bgp scan-time <5-60>

• Question 69:

  An EIGRP domain is redistributed into an OSPF NSSA area. On which router would this redistribution occur?

  A. stub border router
  B. summary router
  C. autonomous system boundary router
  D. backbone router
  C. autonomous system boundary router

• Question 70:

  Refer to the network diagram in the exhibit.

  

  If both ASBRs are advertising the external Destination X network as OSPF E2 route, what is the best path for the R1 router to reach Network X?

  A. R1 will use the path via ASBR 2 as the best path.
  B. R1 will use the path via ASBR 1 as the best path.
  C. R1 will load balance between two equal cost paths via ASBR 1 and ASBR 2.
  D. R1 will sees two equal costs and will choose the path through the ASBR with the lower OSPF router ID.
  B. R1 will use the path via ASBR 1 as the best path.