Cisco 642-887 Online Practice Questions and Exam Preparation

Cisco 642-887 Online Questions & Answers

• Question 171:

  At which layer does Cisco recommend the QoS trust boundary be set for an enterprise network environment?

  A. core layer, facing the distribution layer
  B. distribution layer, facing the access layer
  C. access layer, facing the end hosts
  D. distribution layer, facing the core layer
  C. access layer, facing the end hosts

• Question 172:

  With unmanaged CE routers, at which point in the service provider network is the QoS trust boundary, and what is required at the trust boundary?

  A. between the CE and PE router and mapping of the customer traffic classes into the service provider traffic classes at the PE router ingress
  B. between the CE and PE router and trusting the QoS markings from the CE router and applying the required QoS mechanisms based on the customer QoS markings
  C. between the PE and the P router and mapping of the customer traffic classes into the service provider traffic classes at the P router ingress
  D. between the PE and P router and trusting the QoS markings from the CE router and applying the required QoS mechanisms based on the customer QoS markings
  E. between the customer network and the CE router ingress and applying the required egress QoS policy on the CE router
  A. between the CE and PE router and mapping of the customer traffic classes into the service provider traffic classes at the PE router ingress

• Question 173:

  Referring to the Cisco IOS XR configuration exhibit,

  

  which labels will be advertised by the router with this configuration?

  A. Only the label for 10.1.1.1/32 will be advertised to all the LDP peers.
  B. Labels for all prefixes will be advertised to the 10.1.1.1 LDP peer.
  C. Labels for all prefixes will be advertised to all the LDP peers.
  D. No labels will be advertised to any LDP peers.
  A. Only the label for 10.1.1.1/32 will be advertised to all the LDP peers.

• Question 174:

  On a Cisco router, when will the router actually reserve the bandwidth for the MPLS traffic engineering tunnel?

  A. during the autoroute process
  B. during constraint-based routing calculations
  C. on the receipt of the RSVP Path message
  D. on the receipt of the RSVP Resv message
  D. on the receipt of the RSVP Resv message

• Question 175:

  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
  A. allows for packets to be classified based on the ToS byte values before packet encryption

  ---

  http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a008017405e. shtml The qos pre-classify command When packets are encapsulated by tunnel or encryption headers, QoS features are unable to examine the original packet headers and correctly classify the packets. Packets traveling across the same tunnel have the same tunnel headers, so the packets are treated identically if the physical interface is congested. With the introduction of the Quality of Service for Virtual Private Networks (VPNs) feature, packets can now be classified before tunneling and encryption occur. In this example, tunnel0 is the tunnel name. The qos pre-classify command enables the QoS for VPNs feature on tunnel0: Router(config)# interface tunnel0 Router(config-if)# qos pre-classify

• Question 176:

  Put the MPLS LDP steps on the left into the correct order from top to bottom on the right.

  Select and Place:

  

  

• Question 177:

  An engineer has been tasked to configure a guaranteed 2 Mbps of bandwidth for outgoing FTP traffic on interface FastEthernet 1/1/1 on Cisco IOS XR. Which method accomplishes this configuration?

  A. configure terminal class-map FTP_CLASS match protocol ftp exit policy-map POLICY_1 class FTP_CLASS bandwidth 2000 exit exit interface FastEthernet 1/1/1 service-policy output POLICY_1 end commit
  B. configure terminal class-map FTP_CLASS match protocol ftp exit policy-map POLICY_1 class FTP_CLASS bandwidth 2000000 exit exit interface FastEthernet 1/1/1 service-policy input POLICY_1 end commit
  C. configure terminal access-list 100 permit ip any any eq 21 policy-map POLICY_1 match ip access-list 100 bandwidth 2000 exit exit interface FastEthernet 1/1/1 service-policy output POLICY_1 end commit
  D. configure terminal policy-map POLICY_1 class FTP_CLASS match protocol ftp bandwidth 2000000 exit exit interface FastEthernet 1/1/1 service-policy input POLICY_1 end commit
  A. configure terminal class-map FTP_CLASS match protocol ftp exit policy-map POLICY_1 class FTP_CLASS bandwidth 2000 exit exit interface FastEthernet 1/1/1 service-policy output POLICY_1 end commit

• Question 178:

  Implementing IPoDWDM interfaces on Cisco CRS routers eliminates the need for which network component?

  A. ROADM
  B. external transponders
  C. electrical-optical-electrical converters
  D. electrical cross-connect
  B. external transponders

  ---

  IP over DWDM (IPoDWDM) is a technology used in telecommunications networks to integrate IP Routers and Switches in the OTN (Optical Transport Network).

• Question 179:

  An engineer must automatically copy the IP Prec/DiffServ PHB marking to the EXP bits of the imposed MPLS label on the ingress PE, as well as the MPLS EXP bits to the IP Prec/DiffServ of the egress PE. Which MPLS QoS model is suitable for this requirement?

  A. pipe model
  B. short-pipe model
  C. uniform model
  D. uniform pipe model
  C. uniform model

• Question 180:

  

  Referring to the Cisco IOS XR show command output exhibit, what are three possible reasons that the GigabitEthernet0/1/0/10 LDP IGP sync status is not ready? (Choose three.)

  A. GigabitEthernet0/1/0/10 is not configured to run LDP.
  B. Graceful restart is not configured on the peer.
  C. The LDP neighbor on GigabitEthernet0/1/0/10 is not up.
  D. The OSPF neighbor on GigabitEthernet0/1/0/10 is not up.
  E. LDP is up on GigabitEthernet0/1/0/10, but no label bindings have been received from the peer.
  F. GigabitEthernet0/1/0/10 is a member link of Bundle-Ether9000.
  C. The LDP neighbor on GigabitEthernet0/1/0/10 is not up.
  D. The OSPF neighbor on GigabitEthernet0/1/0/10 is not up.
  E. LDP is up on GigabitEthernet0/1/0/10, but no label bindings have been received from the peer.