Cisco 642-887 Online Practice Questions and Exam Preparation

Cisco 642-887 Online Questions & Answers

• Question 151:

  A network engineer must make a reservable maximum bandwidth of 75 Mbps on a Cisco ASR 9000 series router. Which configuration satisfies this requirement in Cisco IOS XR?

  A. 2802_FY14Q4_CORE_Q33_o1
  B. 2813_FY14Q4_CORE_Q33_o2
  C. 2824_FY14Q4_CORE_Q33_o3
  D. 2835_FY14Q4_CORE_Q33_o4
  C. 2824_FY14Q4_CORE_Q33_o3

• Question 152:

  An engineer is tasked to deploy Fast Reroute for Cisco MPLS TE. Which LSR is in charge to request the Fast Reroute capability along the LSP?

  A. point of local repair
  B. tail end router
  C. ingress and egress PE routers
  D. head-end router
  E. BGP routers acting as route reflectors
  D. head-end router

• Question 153:

  A service provider recently defined new SLA services that provide QoS transparency over MPLS DiffServ-TE services. Which two tunneling modes provide QoS transparency? (Choose two.)

  A. short pipe mode
  B. uniform mode
  C. pipe mode with an explicit NULL LSP
  D. pipe mode without a explicit NULL LSP
  E. best effort mode
  A. short pipe mode
  C. pipe mode with an explicit NULL LSP

• Question 154:

  DS-TE implementations on Cisco routers support which bandwidth pool(s) and class type(s)? (Choose two.)

  A. global pool only
  B. subpool only
  C. global pool and subpool
  D. class-type 0 only
  E. class-type 1 only
  F. class-type 0 and class-type 1
  C. global pool and subpool
  F. class-type 0 and class-type 1

  ---

  Differential Service Tunnels Differential Service Traffic Engineering (TE) is an extension of the regular MPLS Traffic Engineering (MPLSTE) feature. Regular TE does not provide bandwidth guarantees to different traffic classes. A single bandwidth pool (global pool) is used in regular TE that is shared by all traffic. In order to support various class of service (CoS), the ability to provide multiple bandwidth pools is required. These bandwidth pools then can be treated differently based on the requirement for the traffic class using that pool. In RSVP global and subpools reservable bandwidths are configured on a per interface basis to accommodate TE tunnels on the node. Available bandwidth from all configured bandwidth pools is advertised using Interior Gateway Protocol (IGP). RSVP is used to signal the TE tunnel with appropriate bandwidth pool requirements.

• Question 155:

  Which two fields are in the traffic engineering topology database? (Choose two.)

  A. TE-metric
  B. IGP metric
  C. link delay
  D. LSP setup priority
  E. LDP authentication
  A. TE-metric
  D. LSP setup priority

• Question 156:

  Which statement describes the QoS behavior between P and PE routers of an MPLS provider network for an L3VPN service?

  A. The PE function honors DSCP markings set by the CE.
  B. The customer and provider must agree on DSCP classification and traffic priorities.
  C. Classification of customer traffic is handled by the P router.
  D. The PE function cannot map DSCP markings to MPLS EXP bits.
  B. The customer and provider must agree on DSCP classification and traffic priorities.

• Question 157:

  A company asks an engineer to provide an explanation for implementing MPLS DiffServ- TE services. Which option is a DiffServ-TE fundamental concept that should be highlighted?

  A. expedited forwarding
  B. assured forwarding
  C. class of service
  D. class types
  E. fast reroute
  D. class types

• Question 158:

  Referring to the traceroute output exhibit that is shown,

  

  which statement is correct?

  A. There is no problem with the end-to-end LSP as indicated by the successful trace.
  B. Normal PHP operation is performed by the hop 4 router.
  C. The end-to-end LSP is broken at hop 4.
  D. At each hop, each LSR is able to perform label swapping.
  C. The end-to-end LSP is broken at hop 4.

• Question 159:

  Which configuration fulfills the requirement of configuring LDP with Cisco Nonstop Forwarding on a router with 5 minutes time to hold the forwarding table information and 1 minute retry timer value for an LDP connection?

  A. mpls ldp graceful-restart graceful-restart forwarding state-holdtime 5 graceful-restart reconnect-timeout 1 interface GigabitEthernet0/0/0/0 !
  B. mpls ldp graceful-restart graceful-restart forwarding state-holdtime 300 graceful-restart reconnect-timeout 60 interface GigabitEthernet0/0/0/0 !
  C. mpls ldp nsr graceful-restart graceful-restart forwarding state-holdtime 300 graceful-restart reconnect-timeout 60 interface GigabitEthernet0/0/0/0 !
  D. mpls ldp nsr graceful-restart graceful-restart forwarding state-holdtime 5 graceful-restart reconnect-timeout 1 interface GigabitEthernet0/0/0/0 !
  B. mpls ldp graceful-restart graceful-restart forwarding state-holdtime 300 graceful-restart reconnect-timeout 60 interface GigabitEthernet0/0/0/0 !

• Question 160:

  An engineer sets up QoS over MPLS networks. How many classes of traffic can one LSP support?

  A. as many as 8, because the EXP field is 3 bits
  B. as many as 3, because the EXP field is 3 bits
  C. as many as 64, because the DSCP field is 6 bits
  D. as many as 6, because the DSCP field is 6 bits
  A. as many as 8, because the EXP field is 3 bits