Cisco 642-887 Online Practice Questions and Exam Preparation

Cisco 642-887 Online Questions & Answers

• Question 81:

  Which two interface types can support qos pre-classify (Choose two.)

  A. virtual templates
  B. tunnel interfaces
  C. FastEthernet
  D. FDDI
  B. tunnel interfaces
  C. FastEthernet

• Question 82:

  An engineer is allocating a determined amount of bandwidth to a customer Cisco MPLS TE tunnel to guarantee its availability on a 24/7 SLA type. Which option must be configured to make sure the customer is able to use the bandwidth agreed on the SLA?

  A. RSVP that guarantees bandwidth availability end-to-end
  B. Cisco MPLS TE tunnel to signal the bandwidth required
  C. a QoS policy to reinforce the RSVP bandwidth reservation
  D. overprovisioning to guarantee bandwidth
  C. a QoS policy to reinforce the RSVP bandwidth reservation

• Question 83:

  Refer to the exhibit.

  

  What is the available reservable bandwidth for P6 after successful establishment of Tunnel 1?

  A. 490 Kbps
  B. 500 Kbps
  C. 490 Mbps
  D. 500 Mbps
  D. 500 Mbps

• Question 84:

  A network engineer must design a core network routing domain that supports Cisco MPLS TE. Which two interior gateway protocols represent viable solutions? (Choose two.)

  A. Routing Information Protocol version 2
  B. Open Shortest Path First
  C. Enhanced Interior Gateway Routing Protocol
  D. Intermediate-System to Intermediate-System
  E. Border Gateway Protocol
  B. Open Shortest Path First
  D. Intermediate-System to Intermediate-System

• Question 85:

  An engineer deployed a Cisco MPLS TE next-hop protection over a switched environment. While testing the link protection, an excessive IGP delay in the reconvergence time is seen. Which action fixes this issue?

  A. Replace the existing link with a routed back-to back link
  B. Configure object tracking
  C. Set up more aggressive IGP timers
  D. Implements BFD on the link
  B. Configure object tracking

• Question 86:

  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?

  A. a static route that points to the link
  B. BGP routes that points to the link
  C. an OSPF or IS-IS instance that explicitly advertises the back-up tunnel
  D. rerouted traffic by the back-up tunnel in the event of link failure
  D. rerouted traffic by the back-up tunnel in the event of link failure

• Question 87:

  On the Cisco ASR9K router, when using the bandwidth command to specify the minimum guaranteed bandwidth to be allocated for a specific class of traffic, what will be used as the queuing algorithm?

  A. custom queuing
  B. CBWFQ
  C. WFQ
  D. FIFO
  E. priority queuing
  B. CBWFQ

  ---

  Class based weighted fair queuing (CB-WFQ) was initially released without the support of a priority queuing system, thus it could not guarantee the delay and jitter (delay variation) requirements of real-time, interactive voice and video conversations. Since for CBWFQ, the weight for a packet belonging to a specific class is derived from the bandwidth assigned to the class, which in turn determines the order in which packets are sent. All packets are serviced fairly based on weight and no class of packets may be granted strict priority. This scheme poses problems for voice traffic that is largely intolerant of delay, especially variation in delay

• Question 88:

  What is an important requirement with MPLS applications like Layer 3 MPLS VPNs?

  A. All the PE routers loopback addresses should be summarized to reduce the number of routing table entries in the core routers.
  B. Targeted hellos are required between all the PE routers.
  C. An end-to-end LSP is required between the PE routers.
  D. The LSPs that are built between the PE routers must be symmetrical (bidirectional).
  C. An end-to-end LSP is required between the PE routers.

• Question 89:

  When troubleshooting LDP operations on the Cisco IOS and IOS XE routers, what is one of the first things that should be verified?

  A. if running OSPF as the IGP, ensure that OSPFv3 has been enabled
  B. check if the ip cef command has been enabled
  C. verify in the running configurations that all of the required LDP interfaces are defined under the mpls ldp command configuration mode
  D. verify if there are any access lists that are denying TCP and UDP port 464 packets
  B. check if the ip cef command has been enabled

• Question 90:

  Which Cisco IOS XR high-availability feature is used to prevent routes from being used before LDP converges?

  A. LDP session protection
  B. LDP-IGP synchronization
  C. BFD
  D. IGP session protection
  B. LDP-IGP synchronization