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Question 1:

Refer to the exhibit.

IT administrators report packet loss on the critical applications coming with CoS 4. Which option is the appropriate configuration to have a lower drop probability when the packets are processed using

DSCP values?

A. set ip dscp af22

B. set ip dscp af41

C. set ip dscp af13

D. set ip dscp af32

Correct Answer: B


Question 2:

An engineer looks at packet captures and sees that the MPLS header field of a packet indicates a bottom of stack field of 0. What can the engineer conclude from this information?

A. The packet is an AToM packet

B. One label is on the packet

C. At least one more MPLS label is on the packet

D. No labels are on the packet

Correct Answer: C


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 Practice Test642-887 Study Guide642-887 Braindumps

Question 6:

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 7:

Which method is used to mark traffic matched by class-map MY_CLASS as Expedited Forwarding?

A. set ip dscp cs7

B. set dscp cs7

C. set dscp 46

D. set dscp 45

Correct Answer: C


Question 8:

Which two protocols facilitate label bindings by neighboring routers? (Choose two.)

A. IS-IS

B. LDP

C. OSPF

D. EIGRP

E. BGP

Correct Answer: BE


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:

Refer to the partial Cisco IOS XR configurations exhibit for Router 1 and Router 2.

There are two routers that are connected back to back over the Gigabit Ethernet link. If the “show mpls ldp neighbor” command output on Router 1 does not show LDP peering with Router 2, what could be the possible root cause of the LDP peering problem?

A. missing interface under OSPF IGP configuration

B. hello timers mismatch on Router 1 and Router 2

C. password for LDP session mismatch on Router 1 and Router 2

D. MPLS LDP session protection is not configured

Correct Answer: A


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