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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:

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 3:

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 4:

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

Question 5:

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

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

Question 6:

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 7:

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

Question 8:

Which Cisco IOS XR high-availability feature is used to prevent routes from being used before LDP converges?

A. LDP session protection

B. LDP-IGP synchronization


D. IGP session protection

Correct Answer: B

Question 9:

Refer to the exhibit.

A network engineer who is working for an ISP wants to override the QoS that comes from the customer. The engineer wants to set a QoS value of 5 for all traffic. What are two reasons why the configuration is not working? (Choose two.)

A. The service-policy command should point to the service policy, not to the class map

B. The set command should reference CoS instead of MPLS EXP bits

C. The service-policy configuration should be set as output

D. The policy-map configuration needs to reference class-map Custom1

E. The number 350 in the xconnect command should appear after the encapsulation type

Correct Answer: AD

Question 10:

Which two values are class-selector DSCP values? (Choose two.)

A. 001001

B. 000111

C. 111000

D. 100000

E. 000001

Correct Answer: CD

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