Cisco 642-887 Online Practice Questions and Exam Preparation

Cisco 642-887 Online Questions & Answers

• Question 161:

  An engineer has been tasked to configure a guaranteed 10 Mbps priority queue for traffic matched by class-map VOICE_CLASS on Cisco IOS XR. Which policy must be applied for outgoing traffic on interface FastEthernet 0/0/1?

  A. configure policy-map VOICE_POLICY class VOICE_CLASS police rate 10000 exceed-action drop exit priority level 1 exit exit interface FastEthernet 0/0/1 service-policy output VOICE_POLICY commit
  B. configure policy-map VOICE_POLICY class VOICE_CLASS priority percent 10 exit exit interface FastEthernet 0/0/1 service-policy output VOICE_POLICY commit
  C. configure policy-map VOICE_POLICY class VOICE_CLASS police rate 1000 exceed-action drop exit priority level 1 exit exit interface FastEthernet 0/0/1 service-policy output VOICE_POLICY commit
  D. configure policy-map VOICE_POLICY class VOICE_CLASS police rate 10 Mbps exceed-action shape exit priority level 1 exit exit interface FastEthernet 0/0/1 service-policy output VOICE_POLICY commit
  A. configure policy-map VOICE_POLICY class VOICE_CLASS police rate 10000 exceed-action drop exit priority level 1 exit exit interface FastEthernet 0/0/1 service-policy output VOICE_POLICY commit

• Question 162:

  On the Cisco IOS XR, when using the match protocol command within a class-map to classify traffic, you noticed that the match protocol option on the Cisco IOS XR shows much fewer protocol options than on the Cisco IOS or IOS XE, like there is no option such as the match protocol yahoo-messenger command on the Cisco IOS XR. Why is this?

  A. because the Cisco IOS XR router does not have the correct software packages installed
  B. because when defining the class-map, the class-map type should be set to type inspect: class-map type inspect class-map-name command
  C. because NBAR is not supported on the Cisco IOS XR
  D. because flexible packet matching has not been enabled on the Cisco IOS XR router
  C. because NBAR is not supported on the Cisco IOS XR

• Question 163:

  You are tasked to enable LDP on many of the interfaces on the Cisco CRS-3 router, and because there are many interfaces that need to have LDP enabled, you mistakenly did not enable LDP on all the required interfaces. To prevent this issue from happening again in the future, what could you do the next time you need to enable LDP on many interfaces?

  A. use the mpls ldp auto-config command under the IGP routing process
  B. use the mpls ldp sync command under the IGP routing process
  C. use the interface all command under the MPLS LDP process
  D. use the discovery command under the MPLS LDP process
  A. use the mpls ldp auto-config command under the IGP routing process

• Question 164:

  On a Cisco IOS XR router, which mechanism protects the router resources by filtering and policing the packets flows that are destined to the router that is based on defined flow-type rates?

  A. LLQ
  B. LPTS
  C. Committed Access Rate
  D. Control Plane Policing
  E. Management Plane Protection
  F. NetFlow
  G. ACL
  B. LPTS

  ---

  Local Packet Transport Services (LPTS) maintains tables describing all packet flows destined for the secure domain router (SDR), making sure that packets are delivered to their intended destinations. The Low Latency Queueing feature brings strict priority queueing to Class-Based Weighted Fair Queueing (CBWFQ).

• Question 165:

  Which statement defines how MPLS LDT Graceful Restart works after a service interruption?

  A. It works independent of neighboring routers to recover MPLS forwarding information
  B. It works by helping all neighboring MPLS LDP routers to recover MPLS forwarding information
  C. It works by helping neighboring routers with MPLS LDP SSO/NSF and Graceful Restart to recover MPLS forwarding information
  D. It works independent of neighboring non-LDP Graceful Restart routers to recover MPLS forwarding information
  C. It works by helping neighboring routers with MPLS LDP SSO/NSF and Graceful Restart to recover MPLS forwarding information

• Question 166:

  Which method is used to mark traffic matched by class-map MY_CLASS as Expedited Forwarding?

  A. set ip dscp cs7
  B. set dscp cs7
  C. set dscp 46
  D. set dscp 45
  C. set dscp 46

• Question 167:

  An engineer is working in a service provider environment to troubleshoot a MPLS VPN. The engineer determines that LDP neighborship is flapping between two routers and causing disruption to the traffic. Which LDP feature can help to solve the issue?

  A. LDP Discovery
  B. LDP auto-configuration
  C. LDP graceful-restart
  D. LDP NSF
  C. LDP graceful-restart

• Question 168:

  Which QoS mechanism is used for congestion avoidance?

  A. LLQ
  B. CBWFQ
  C. WRED
  D. LFI
  E. traffic policing
  C. WRED

• Question 169:

  Which class-map configuration selects the following traffic?

  All incoming traffic from interface GigabitEthernet 0/1 that is marked with dscp ef

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  A. Option A

• Question 170:

  An engineer wants to extend the trust boundary to a Cisco IP Phone. Which protocol should be used?

  A. CDP
  B. CoS
  C. ToS
  D. 802.1Q
  A. CDP