[Free] Download New Updated (December) Cisco 642-889 Exam Questions 81-90

By | December 4, 2015

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QUESTION 81

What is an advantage of using the Cisco EVC infrastructure to implement carrier-class Ethernet services that are not available on non-EVC-capable platforms?

 

A.

PW redundancy

B.

interworking support

C.

PW stitching support

D.

flexible frame-matching support and VLAN tag manipulation

E.

local cross-connect support

 

Correct Answer: D

Explanation:

http://www.cisco.com/web/YU/events/expo_08/pdfs/Carrier_Ethernet_Marek_Moskal.pdf

 

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QUESTION 82

Which option is the correct command to define an interface as Layer 2 on the Cisco ASR 9000?

 

A.

RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 l2transport

B.

RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 layer2

C.

RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 switchport

D.

RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 xconnect

 

Correct Answer: A

 

 

QUESTION 83

DRAG DROP

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Correct Answer:

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QUESTION 84

Which option is the minimal configuration required inside the L2VPN section of a Cisco IOS XR PE router to activate VPLS functionality?

 

A.

l2vpn

bridge group test

bridge-domain test

interface TenGigE0/0/0/1.30

!

vfi test

vpn-id 600

autodiscovery bgp

rd 10.10.10.1:30

route-target 1:300

signaling-protocol bgp

ve-id 10

B.

l2vpn

bridge group test

bridge-domain test

interface TenGigE0/0/0/1.30

!

vfi test

neighbor 10.10.10.2 pw-id 1400

mpls static label local 1400 remote 1500

C.

l2vpn

bridge group test

bridge-domain test

interface TenGigE0/0/0/1.30

!

vfi test

neighbor 10.10.10.2 pw-id 1400

D.

l2vpn

bridge group test

bridge-domain test

interface TenGigE0/0/0/1.30

!

vfi test

vpn-id 600

autodiscovery bgp

rd 10.10.10.1:30

route-target 1:300

signaling-protocol bgp

E.

l2vpn

bridge group test

bridge-domain test

vfi test

autodiscovery bgp

rd 10.10.10.1:30

route-target 1:300

signaling-protocol bgp

ve-id 10

 

Correct Answer: C

 

 

QUESTION 85

When implementing EoMPLS on Cisco IOS XR routers, which command under the l2vpn configuration mode is used to define the pseudowire?

 

A.

pbb

B.

xconnect

C.

connect

D.

bridge

E.

bridge-domain

 

Correct Answer: B

Explanation:

http://www.cisco.com/en/US/docs/wireless/asr_901/Configuration/Guide/eompls.html

 

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QUESTION 86

When implementing MPLS Layer 3 VPNs with customers running OSPF as the CE-PE routing protocol, the service provider MPLS backbone looks like what to the CE routers?

 

A.

the backbone (Area 0)

B.

an external routing domain

C.

a superbackbone that is transparent to the CE OSPF routers

D.

a transit area (similar to a transit area for supporting virtual links)

 

Correct Answer: C

 

 

QUESTION 87

Which two statements regarding Cisco 6PE operations are correct? (Choose two.)

 

A.

The top label in the label stack is assigned by MP-BGP, and it is used to reach the egress PE.

B.

The inner label in the label stack is assigned by MP-BGP, and it is used for IPv6 forwarding at the egress PE.

C.

The top label in the label stack is assigned by LDP, and it is used to reach the egress PE.

D.

The inner label in the label stack is assigned by LDP, and it is used for IPv6 forwarding at the egress PE.

 

Correct Answer: BC

Explanation:

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6553/prod_presentation0900aecd80311df4.pdf

 

 

QUESTION 88

A network engineer is troubleshooting an MPLS Layer 3 VPN and discovers that routes are being learned by CE routers, but there is no IP connectivity. Which option is the most likely cause?

 

A.

The provider does not have an end-to-end label switch path.

B.

The customer does not have an end-to-end label switch path.

C.

The customer is not sharing labels with the provider.

D.

The provider is not sharing labels with the customer.

E.

The providers PE to CE routing protocol is misconfigured.

F.

The customers PE to CE routing protocol is misconfigured.

 

Correct Answer: A

 

 

QUESTION 89

Which organization provides and promotes a standards-based description of service provider services offering?

 

A.

MEF

B.

IETF

C.

IEEE

D.

ITU

 

Correct Answer: A

 

QUESTION 90

Which option is the primary purpose of central service MPLS VPNs?

 

A.

provide customer access to provider resources while ensuring customers cannot communicate directly

B.

provide the provider access to customer resources while ensuring customers cannot communicate directly

C.

provide other service providers access to provider resources

D.

provide other service providers access to customer resources

 

Correct Answer: A

 

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