[Free] Download Latest (March 2016) Cisco 642-887 Real Exam 81-90

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QUESTION 81

An engineer has been tasked to configure a guaranteed 10 Mbps priority queue for traffic matched by class-map VOICE_CLASS on Cisco IOS XR. Which policy must be applied for outgoing traffic on interface FastEthernet 0/0/1?

 

A.

configure

policy-map VOICE_POLICY

class VOICE_CLASS

police rate 10000

exceed-action drop

exit

priority level 1

exit

exit

interface FastEthernet 0/0/1

service-policy output VOICE_POLICY

commit

B.

configure

policy-map VOICE_POLICY

class VOICE_CLASS

pri
ority percent 10

exit

exit

interface FastEthernet 0/0/1

service-policy output VOICE_POLICY

commit

C.

configure

policy-map VOICE_POLICY

class VOICE_CLASS

police rate 1000

exceed-action drop

exit

priority level 1

exit

exit

interface FastEthernet 0/0/1

service-policy output VOICE_POLICY

commit

D.

configure

policy-map VOICE_POLICY

class VOICE_CLASS

police rate 10 Mbps

exceed-action shape

exit

priority level 1

exit

exit

interface FastEthernet 0/0/1

service-policy output VOICE_POLICY

commit

 

Correct Answer: A

 

 

QUESTION 82

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

 

Correct Answer: A

Explanation:

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 83

On the Cisco IOS XR, which MQC configuration is different than on the Cisco IOS and IOS XE?

 

A.

On the Cisco IOS XR, WRED can only be applied in the output direction.

B.

On the Cisco IOS XR, marking can only be applied in the input direction.

C.

On the Cisco IOS XR, LLQ can be applied in the input or output direction.

D.

On the Cisco IOS XR, LLQ can use up to four priority queues: level 1, level 2, level 3, and level 4.

 

Correct Answer: C

 

 

QUESTION 84

What is the ter
m that is used for the label that an LSR assigns and distributes to other LSRs in MPLS?

 

A.

Local

B.

Remote

C.

Explicit

D.

Explicit Null

E.

Aggregate

 

Correct Answer: A

 

 

QUESTION 85

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 86

Which of the following three statements are correct regarding IPv6 QoS? (Choose three.)

 

A.

The traffic class field in the IPv6 header can be used to set specific precedence or DSCP values.

B.

A 20-bit flow label field enables per-flow processing.

C.

DS-TE is not supported by IPv6.

D.

Per-hop behavior in IPv6 networks is based on EXP bits.

E.

IPv6 QoS features are configured using the modular QoS CLI on Cisco routers.

 

Correct Answer: ABE

Explanation:

http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd8026004d.pdf

 

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QUESTION 87

DRAG DROP

clip_image004

 

Correct Answer:

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QUESTION 88

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

C.

BFD

D.

IGP session protection

 

Correct Answer: B

 

 

QUESTION 89

Refer to the exhibit. From which table was the information obtained?

 

clip_image008

 

A.

FIB

B.

CEF

C.

LIB

D.

LFIB

 

Correct Answer: D

 

 

QUESTION 90

Which affinity value will be matched by the affinity bit mask of the affinity 0xFF00000A mask 0xFFFF000F command?

 

A.

0xFFFF000A

B.

0xFF00EEEA

C.

0xFF000000

D.

0x00000000

E.

0x11110001

 

Correct Answer: B

Explanation:

0xFF00000A 11111111000000000000000000001010

0xFFFF000F 11111111111111110000000000001111

0xFF00EEEA 11111111000000001110111011101010

 

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