Cisco 642-887 Online Practice Questions and Exam Preparation

Cisco 642-887 Online Questions & Answers

• Question 51:

  Which Cisco IOS XR command should be used to identify if MPLS TE FRR is enabled?

  A. show mpls traffic-eng tunnel
  B. show mpls frr
  C. show mpls traffic-eng protection
  D. show mpls protection
  E. show mpls fast-reroute
  A. show mpls traffic-eng tunnel

• Question 52:

  Refer to the Cisco IOS XR policy-map configuration exhibit.

  

  What is wrong with the policy-map configuration?

  A. missing the priority percent command under class one and class two
  B. missing the police command under class one and class two
  C. missing the police command under class three
  D. missing the priority bandwidth command under class one and class two
  E. missing the bandwidth command under class one and class two
  B. missing the police command under class one and class two

  ---

  Hierarchical policing is also supported. In such a configuration, both parent and child policies have class-maps

  containing policing statements, as in the following example: ! policy-map child class gold police rate percent 50 conform-action set precedence immediate exceed-action drop ! ! policy-map parent class match_all police rate 10000 kbps burst 15000 exceed-action drop service-policy child

• Question 53:

  Which three options are class maps able to match? (Choose three.)

  A. match access-group
  B. match protocol http url "*cisco"
  C. match destination-port
  D. match DSCP
  E. match all
  F. match mac-address
  A. match access-group
  B. match protocol http url "*cisco"
  D. match DSCP

• Question 54:

  How many labels does an MPLS packet have, with a bottom-of-stack label set to zero?

  A. The packet has no label.
  B. The packet has one label.
  C. The packet may have one or more labels.
  D. The packet has at least two labels.
  D. The packet has at least two labels.

• Question 55:

  Which four options are methods by which labels can be assigned in the label stack to an IP prefix? (Choose four.)

  A. LDP
  B. CEF
  C. BGP
  D. RSVP
  E. static
  F. IGP
  G. route recursion
  H. manual tagging
  A. LDP
  C. BGP
  D. RSVP
  G. route recursion

• Question 56:

  Which protocol is used to send MPLS OAM traffic over an MPLS network?

  A. ICMP
  B. IP protocol number 137
  C. TCP
  D. UDP
  D. UDP

• Question 57:

  When a link flaps, an mpls ldp session will also flap. Which feature minimizes traffic loss and provides faster convergence after the link is re-established?

  A. BFD
  B. MPLS LDP IGP SYNC
  C. graceful restart
  D. LDP session protection
  E. LDP nonstop routing
  D. LDP session protection

• Question 58:

  Scenario: From PE8 router, what is the label action used to reach the P2 loopback 0 interface 10.0.2.1/32?

  

  

  A. Swap label 35 with label 16004
  B. Push label 16004
  C. Pop label 35
  D. Pop label 16009
  E. Push Label 16009
  F. Swap label 35 with label 16009
  C. Pop label 35

  ---

  Explanation: show mpls forwarding-table , find prefix 10.0.2.1 and you will see there under outgoing Label "Pop Label" (This is actually logic because the prefix is directly connected and therefore the packet will forward without label). If the router should forward any packet to that prefix, the packet should be received with Local label on PE8 (Local Label = 35), the router will remove it and forward it without Label.

• Question 59:

  Which three steps are required to configure QPPB on Cisco IOS XR routers? (Choose three.)

  A. Apply a QPPB route policy to the BGP process using the table-policy command
  B. Apply a QPPB route policy to the BGP neighbor using the route-policy command
  C. Define a QPPB route policy to match the customer routes, then set the IP precedence or qos-group
  D. Define a QPPB route policy to match the customer IP precedence or qos-group markings, then set the BGP community
  E. Enable QPPB on an interface using the ipv4 bgp policy propagation input ip- precedence|qos-group destination|source command
  F. Enable QPPB on an interface using the ipv4 bgp policy propagation output ip- precedence|qos-group destination|source command
  A. Apply a QPPB route policy to the BGP process using the table-policy command
  C. Define a QPPB route policy to match the customer routes, then set the IP precedence or qos-group
  E. Enable QPPB on an interface using the ipv4 bgp policy propagation input ip- precedence|qos-group destination|source command

  ---

  QoS Policy Propagation via BGP (QPPB), is a mechanism that allows propagation of quality of service (QoS) policy and classification by the sending party based on access lists, community lists and autonomous system paths in the Border Gateway Protocol (BGP), thus helping to classify based on destination instead of source address.

• Question 60:

  A network operations center analyzes a Wireshark capture and tries to verify which QoS policy is effective over a customer router. How many bits define the DSCP values?

  A. 3
  B. 6
  C. 8
  D. 16
  B. 6