Cisco 642-887 Online Practice Questions and Exam Preparation

Cisco 642-887 Online Questions & Answers

• Question 101:

  In Cisco IOS, what must be configured to ensure that an MPLS TE tunnel becomes active?

  A. layer 3 addressing on the tunnel, to establish bidirectional communication over the tunnel
  B. the tunnel for autoroute, to ensure proper installation into the forwarding plane
  C. a path-option configuration, for either dynamic or explicit paths
  D. the tunnel with a minimum bandwidth value, to properly calculate CSPF
  A. layer 3 addressing on the tunnel, to establish bidirectional communication over the tunnel

• Question 102:

  Refer to the exhibit. From which table was the information obtained?

  

  A. FIB
  B. CEF
  C. LIB
  D. LFIB
  D. LFIB

• Question 103:

  Which option describes the IPv6 flow label field?

  A. a 3-bit field used for marking a traffic flow
  B. an 8-bit field used for labeling a traffic flow
  C. a 20-bit field used to tag a traffic flow throughout the network
  D. an 8-bit field out of which the first 6 are used to classify packets
  C. a 20-bit field used to tag a traffic flow throughout the network

• Question 104:

  The Cisco IOS and IOS XE qos pre-classify command allows which kind of packet classification on IP packets that are encapsulated with GRE and IPsec?

  A. allows for packets to be classified based on the ToS byte values before packet encryption
  B. allows for packets to be classified based on the ToS byte values after packet encryption
  C. allows for packets to be classified based on the packet payload before packet encryption
  D. allows for packets to be classified based on the packet payload after packet encryption
  E. allows for packets to be classified based on the packet header parameters other than the ToS byte values after packet encryption
  E. allows for packets to be classified based on the packet header parameters other than the ToS byte values after packet encryption

• Question 105:

  A network architect recently deployed AToM solutions for large enterprises over a service provider core

  network. The architect now asks to deploy QoS over the same VPN to reinforce the SLA for these customers.

  Which MPLS label field can be used for this purpose?

  A. discard/eligibility field
  B. type of service
  C. last 8 bits
  D. experimental bits
  D. experimental bits

• Question 106:

  The regional operation center deploys a Cisco MPLS TE tunnel over the company's core network. The Cisco MPLS TE tunnel is up and no error is detected, but no traffic is traversing the tunnel. Which two issues are possible causes? (Choose two.)

  A. The provider edge router is not performing the correct redistribution.
  B. The interior gateway protocol has no knowledge of the Cisco MPLS TE tunnel.
  C. No static route has been defined to route data traffic over the Cisco MPLS TE tunnel.
  D. The customer edge router is injecting rogue IPv4 prefixes in the provider edge routing table.
  E. The end-to-end label switched path has not been established.
  B. The interior gateway protocol has no knowledge of the Cisco MPLS TE tunnel.
  C. No static route has been defined to route data traffic over the Cisco MPLS TE tunnel.

• Question 107:

  Refer to the exhibit.

  

  Which result occurs from this configuration?

  A. The tunnel comes up because of the explicit path configuration and disregards all CSPF calculations
  B. If the explicit path becomes unavailable, the tunnel falls back to dynamic routing paths
  C. If the explicit path becomes unavailable, the tunnel fails
  D. The traffic through the tunnel is limited to 65,000 Kbps of bandwidth
  B. If the explicit path becomes unavailable, the tunnel falls back to dynamic routing paths

• Question 108:

  Which two advantages are reasons that service providers might deploy MPLS? (Choose two.)

  A. to avoid using IGP in the core
  B. to facilitate smooth migrations between legacy WAN technologies
  C. to reduce the throughput overhead of full IPv4/IPv6 headers when traversing the core
  D. to reduce the computational requirements that are placed on router CPUs
  E. to reduce configuration and feature requirements in the core
  C. to reduce the throughput overhead of full IPv4/IPv6 headers when traversing the core
  D. to reduce the computational requirements that are placed on router CPUs

• Question 109:

  You create an MPLS TE tunnel in IOS XR Software and want to configure forwarding on the tunnel. Drag the steps on the left to their correct order on the right.

  Select and Place:

  

  

• Question 110:

  Refer to the exhibit.

  

  While configuring traffic shaping, you implement this configuration. Which additional configuration is required?

  A. a service policy in the outbound direction on the interface
  B. a service policy in the inbound direction on the interface
  C. a default queue
  D. a second class, to match other traffic
  A. a service policy in the outbound direction on the interface