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Question 1:

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

Correct Answer: B


Question 2:

Which three steps are required to configure QPPB on Cisco IOS XR routers? (Choose three.)

A. Apply a QPPB route policy to the BGP process using the table-policy command

B. Apply a QPPB route policy to the BGP neighbor using the route-policy command

C. Define a QPPB route policy to match the customer routes, then set the IP precedence or qos-group

D. Define a QPPB route policy to match the customer IP precedence or qos-group markings, then set the BGP community

E. Enable QPPB on an interface using the ipv4 bgp policy propagation input ip- precedence|qos-group destination|source command

F. Enable QPPB on an interface using the ipv4 bgp policy propagation output ip- precedence|qos-group destination|source command

Correct Answer: ACE

QoS Policy Propagation via BGP (QPPB), is a mechanism that allows propagation of quality of service (QoS) policy and classification by the sending party based on access lists, community lists and autonomous system paths in the Border Gateway Protocol (BGP), thus helping to classify based on destination instead of source address.


Question 3:

Which option is the correct definition of the LB on a Cisco router?

A. a table used by switching functions to forward labeled packets

B. a table that holds the next hop for destination prefixes

C. a label-based adjacency table

D. a table that stores remote and local label bindings

Correct Answer: A


Question 4:

Which two values must be specified in a Cisco NBAR configuration? (Choose two.)

A. port number

B. IP precedence

C. neighbor discovery address

D. CoS

E. transport protocol

Correct Answer: AE


Question 5:

An engineer is deploying CB-WRED across the entire core network to enforce the previously deployed CBWFQ and decides to change the WRED default to make it work with DSCP. Which policy-map command enables this new profile on regular Cisco IOS routers?

A. random-detect

B. random-detect dscp value

C. random-detect dscp based

D. random-detect precedence value

Correct Answer: C


642-887 PDF Dumps642-887 Practice Test642-887 Study Guide

Question 6:

On Cisco routers, which three methods can be used to map traffic into the MPLS traffic engineering tunnel? (Choose three.)

A. on-demand routing

B. static routing

C. optimized edge routing

D. policy-based routing

E. autoroute

Correct Answer: BDE


Question 7:

When configuring class-based WRED on Cisco routers, which WRED parameter is not user configurable on a Cisco IOS XR but is user configurable on a Cisco IOS and IOS XE?

A. the ingress or egress direction where the class-based WRED policy will be applied

B. the maximum threshold

C. the minimum threshold

D. the mark probability denominator

Correct Answer: D


Question 8:

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.

Correct Answer: CDE


Question 9:

Which three conditions can occur when metering traffic using a dual token bucket traffic policing QoS mechanism on Cisco routers? (Choose three.)

A. conform

B. pass

C. violate

D. exceed

E. burst

F. matched

Correct Answer: ACD


Question 10:

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

Correct Answer: C


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