642-887 Latest Exam (Aug 2018)

[Free] 2018(Aug) Ensurepass Cisco 642-887 Dumps with VCE and PDF 41-50

September 14, 2018

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Implementing Cisco Service Provider Next-Generation Core Network Services

Question No: 41 DRAG DROP

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Question No: 42

On Cisco routers, how is hierarchical QoS implemented?

  1. Within the parent policy, reference another child policy using the policy-map command.

  2. Within the child policy, reference another parent policy using the policy-map command.

  3. Use the policy-map command within a service-policy to implement nested policy-maps.

  4. Within the parent policy-map, reference another child policy-map using the service- policy command.

Answer: D

Question No: 43

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

  1. The traffic class field in the IPv6 header can be used to set specific precedence or DSCP values.

  2. A 20-bit flow label field enables per-flow processing.

  3. DS-TE is not supported by IPv6.

  4. Per-hop behavior in IPv6 networks is based on EXP bits.

  5. IPv6 QoS features are configured using the modular QoS CLI on Cisco routers.

Answer: A,B,E Explanation:

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

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Question No: 44

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?

  1. point of local repair

  2. tail end router

  3. ingress and egress PE routers

  4. head-end router

  5. BGP routers acting as route reflectors

Answer: D

Question No: 45

An engineer is setting up a routing instance to route the traffic across the back-up tunnel on a deployed Cisco MPLS TE next-hop protection. Which option describes the result?

  1. a static route that points to the link

  2. BGP routes that points to the link

  3. an OSPF or IS-IS instance that explicitly advertises the back-up tunnel

  4. rerouted traffic by the back-up tunnel in the event of link failure

Answer: D

Question No: 46

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?

  1. BFD


  3. graceful restart

  4. LDP session protection

  5. LDP nonstop routing

Answer: D

Question No: 47

What is the term that is used for the label that an LSR assigns and distributes to other LSRs in MPLS?

  1. Local

  2. Remote

  3. Explicit

  4. Explicit Null

  5. Aggregate

Answer: A

Question No: 48

The network architecture team is proposing to enable Cisco MPLS TE over the entire service provider core network. Which two options are benefits of Cisco MPLS TE that affect their decision? (Choose two.)

  1. Cisco MPLS TE optimizes network resources.

  2. Cisco MPLS TE data flows independent from the underlying IGP.

  3. Cisco MPLS TE increases the data forwarding rate.

  4. Cisco MPLS TE tunneling does not require maintenance.

  5. Cisco MPLS TE offers network resource reservation, which removes any need for QoS MQC policies.

Answer: A,B

Question No: 49

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?

  1. 3

  2. 6

  3. 8

  4. 16

Answer: B

Question No: 50

Which option is the appropriate method for CBWFQ WRED implementation in Cisco IOS XR?

  1. configure

    policy-map POLICY_1 class CLASS1 random-detect default commit

  2. configure

    policy-map POLICY_1 class CLASS1

    wred default commit

  3. configure interface pos 0/0/0/0

    random-detect default commit

  4. configure

policy-map POLICY_1 class CLASS1

weighted random-detect default commit

Answer: A

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