Cisco 642-887 Online Practice Questions and Exam Preparation

Cisco 642-887 Online Questions & Answers

• Question 131:

  Which IOS XR Software feature supports establishing point-to-point and point-to-multipoint TE tunnels

  traversing multiple IGP areas and levels allowing headend and tailend routers to reside in different areas?

  A. loose hop reoptimization
  B. FRR mode protection
  C. interarea support
  D. loose hop expansion
  B. FRR mode protection

• Question 132:

  Drag the Cisco MQC configuration task on the left to match the correct description on the right. (Not all options on the left are required.)

  Select and Place:

  

  

• Question 133:

  Scenario: After reviewing present router configuration CE7 .which two statements are correct regarding behavior of the "IIq" policy-map? (Choose 2)

  

  A. Traffic matched by the "cisco1" class-map will be assigned to the priority queue.
  B. The "IIq" QoS policy is applied to the gi0/0 interface in the output direction
  C. Traffic matched bythe"cisco2" class-map has a maximum bandwidth of 30%
  D. Traffic matched bythe"cisco3" class-map has no priority and has a minimum bandwidth guarantee of 20%
  E. There are no packets being matched by the "class-default" traffic class in the "IIq" policy
  A. Traffic matched by the "cisco1" class-map will be assigned to the priority queue.
  D. Traffic matched bythe"cisco3" class-map has no priority and has a minimum bandwidth guarantee of 20%

  ---

  Explanation: You will notice that "cisco1" class map is assigned to the priority queue (the command is configured under policy-map IIq class cisco1 priority xxx) "cisco2" class map: is indeed configured using bandwidth 30%, however that

  defines the minimum bandwidth but not the maximum.

  "cisco3" class map: is indeed configured using "bandwidth 20%", No priority configured and that will define the minimum guaranteed bandwidth.

  The last choice is wrong! check under "show policy-map interface" There are 4 or more packets being matched by the "class-default" traffic class in the "IIq" policy.

  Class-map: class-default (match-any)

  4 packets, 968 bytes

• Question 134:

  On Cisco routers, which three methods can be used to map traffic into the MPLS traffic engineering tunnel? (Choose three.)

  A. on-demand routing
  B. static routing
  C. optimized edge routing
  D. policy-based routing
  E. autoroute
  B. static routing
  D. policy-based routing
  E. autoroute

• Question 135:

  Which of the following three statements are correct regarding IPv6 QoS? (Choose three.)

  A. The traffic class field in the IPv6 header can be used to set specific precedence or DSCP values.
  B. A 20-bit flow label field enables per-flow processing.
  C. DS-TE is not supported by IPv6.
  D. Per-hop behavior in IPv6 networks is based on EXP bits.
  E. IPv6 QoS features are configured using the modular QoS CLI on Cisco routers.
  A. The traffic class field in the IPv6 header can be used to set specific precedence or DSCP values.
  B. A 20-bit flow label field enables per-flow processing.
  E. IPv6 QoS features are configured using the modular QoS CLI on Cisco routers.

  ---

  http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd 8026004d.pdf

  

• Question 136:

  Scenario: From the PE8 router, how many total prefixes for have an incoming local label assigned (including the imp-null)?

  

  A. 45
  B. 21
  C. 66
  D. 22
  B. 21

  ---

  Explanation: On PE8 issue: show mpls ip binding summary and look at "assigned in labels". That value is the correct answer NOT "learned out label".

  

• Question 137:

  Within the service provider core network, which two QoS mechanisms are typically deployed on the P routers? (Choose two.)

  A. LLQ
  B. traffic policing and remarking
  C. WRED
  D. traffic shaping
  E. traffic classification and markings
  F. link fragmentation and interleaving
  A. LLQ
  C. WRED

• Question 138:

  Which message is sent through the desired LSP path by the headend router and is used to determine available resources?

  A. PATH
  B. TENT
  C. RSVP
  D. RESV
  A. PATH

• Question 139:

  A DSCP value of 41 in decimal corresponds to which IP precedence value?

  A. 3 ?Flash
  B. 4 ?Flash Override
  C. 5 ?Critical
  D. 6 ?Internet Control
  E. 7 ?Network Control
  C. 5 ?Critical

  ---

  = INT(41/8)

  The AF behavior group defines four separate AF classes with Class 4 having the highest priority. Within each class, packets are given a drop precedence (high, medium or low). The combination of classes and drop precedence yields twelve

  separate DSCP encodings from AF11 through AF43 (see table)

  

• Question 140:

  You are configuring MPLS LDP in a new network segment and notice that LDP sessions are discovered but no sessions are established. Which issue is preventing the establishment of the LDP neighbors?

  A. The loopback addresses of the label switch routers are unavailable
  B. MPLS labels are not allocated for local routers
  C. IP Cisco Express Forwarding is disabled on the label switch routers
  D. An access link is blocking TCP port 711 on the MPLS routers
  A. The loopback addresses of the label switch routers are unavailable