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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:

A network engineer must make a reservable maximum bandwidth of 75 Mbps on a Cisco ASR 9000 series router. Which configuration satisfies this requirement in Cisco IOS XR?

A. 2802_FY14Q4_CORE_Q33_o1

B. 2813_FY14Q4_CORE_Q33_o2

C. 2824_FY14Q4_CORE_Q33_o3

D. 2835_FY14Q4_CORE_Q33_o4

Correct Answer: C


Question 4:

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 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:

Which option is the appropriate way to configure a color-aware, dual-rate policer together with a color-blind, single-rate policer for the rest of the traffic?

A. class-map match-all CLASS1 match dscp af31 class-map match all CLASS2 match dscp af32 class-map match-all CLASS3 match dscp ef policy-map POLICY1 class CLASS1 police rate 100000 peak-rate 200000 conform-color CLASS2 exceed-color CLASS3 conform-action set-dscp-transmit af11 exceed-action set-dscp-transmit af21 violate-action set-dscp-transmit af23

B. class-map match-all CLASS 1 match dscp af31 class-map match-all CLASS2 match dscp af32 class-map match-all CLASS3 match dscp af33 policy-map POLICY1 class CLASS1 police rate 100000 burst 31250 conform-color CLASS2 exceed-color CLASS3 conform-action set-dscp-transmit af11 exceed-action set-dscp-transmit af21 violate-action set-dscp-transmit af23

C. class-map match-all CLASS 1 match dscp af31 af32 af33 class-map match-all CLASS2 match dscp af32 class-map match-all CLASS3 match dscp af33 policy-map POLICY1 class CLASS1 police rate 100000 burst 31250 conform-color CLASS2 exceed-color CLASS3 conform-action set-dscp-transmit af31 exceed-action set-dscp-transmit af32 violate-action set-dscp-transmit af33 class class-default police rate percent 10 peak-rate percent 30

D. class-map match-all CLASS 1 match dscp af31 af32 af33 class-map match-all CLASS2 match dscp af32 class-map match-all CLASS3 match dscp af33 policy-map POLICY1 class CLASS1 police rate 100000 peak-rate 200000 conform-color CLASS2 exceed-color CLASS3 conform-action set-dscp-transmit af31 exceed-action set-dscp-transmit af32 violate-action set-dscp-transmit af33 class class-default police rate percent 10 peak-rate percent 30

E. class-map match-all CLASS 1 match dscp af31 af32 af33 class-map match-all CLASS2 match dscp af32 class-map match-all CLASS3 match dscp af33 policy-map POLICY1 class CLASS1 police rate 100000 peak-rate 200000 conform-color CLASS2 exceed-color CLASS3 conform-action set-dscp-transmit af31 exceed-action set-dscp-transmit af32 violate-action set-dscp-transmit af33 class class-default police rate 10000

Correct Answer: E


Question 7:

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 8:

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 9:

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 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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