Download New Latest (May) Cisco 642-889 Actual Tests 11-20

By | May 17, 2015

Ensurepass

 

QUESTION 11

Implementing H-VPLS instead of VPLS reduces which requirement?

 

A.

having a full mesh of PWs between all the PE routers in the service provider MPLS core

B.

having a full mesh of PWs between all the UPE routers

C.

having to implement QinQ tagging between the UPE and the NPE

D.

having to implement MPLS LDP between the UPE and the NPE

E.

the overhead of using BGP or LDP autodiscovery

 

Answer: A

Explanation:

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C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 12

Which VPN technology uses the Group Domain of Interpretation as the keying protocol and IPsec for encryption that is often deployed over a private MPLS core network?

 

A.

DMVPN

B.

GET VPN

C.

SSL VPN

D.

L2TPv3

 

Answer: B

Explanation:http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6635/ps7180/deploy ment_guide_c07_554713.html

 

 

QUESTION 13

What happens if the destination MAC address is not present in the table for the packets that are received on one of the ACs in VPLS?

 

A.

Packets are switched only to the PW.

B.

Packets are flooded only to the other local ACs.

C.

Packets are flooded on all other ACs and on all PWs that are associated with the bridge domain.

D.

Packets are dropped.

 

Answer: C

 

 

QUESTION 14

In MPLS Layer 3 VPN implementations, what is used at the PEs to transform the customer IPv4 prefixes into a unique 96-bit prefix?

 

A.

RT

B.

RD

C.

VC ID

D.

PW ID

E.

AS number

 

Answer: B

 

 

QUESTION 15

Which Layer 2 protocol parameters can be carried inside the control word when implementing AToM service?

 

A.

PW ID

B.

Frame Relay FECN, BECN, and DE bits

C.

encapsulation type

D.

VC type

 

Answer: B

Explanation:http://www.cisco.com/en/US/products/ps6603/products_qanda_item09186a008009d4e3.sh tml#wp39173

 

Q. How does Frame Relay over MPLS work?

 

A.Traffic is encapsulated in MPLS packets and forwarded across the MPLS network. When encapsulating Frame Relay over MPLS, the Frame Relay header and the frame check sequence (FCS) are stripped from the packet. The bits for Backward Explicit Congestion Notification (BECN), Forward Explicit Congestion Notification (FECN), Discard Eligibility (DE) and Command/Response (C/R) are carried across the MPLS network in the “Control Word” header.

 

 

QUESTION 16

DRAG DROP

 

 

 

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Answer:

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A.

 

B.

 

C.

 

D.

 

 

Answer:

 

 

QUESTION 17

When implementing a Layer 2 transport subinterface on a Cisco IOS XR router, which encapsulation option is used to match any packets that are not matched by any other service instances?

 

A.

default

B.

untagged

C.

any

D.

tag

 

Answer: A

Explanation:

 

 

clip_image004

 

C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 18

What is required on a Cisco IOS XR router to assign an interface to a VRF?

 

A.

Assign the VRF to the interface, and then re-enable Cisco Express Forwarding on the interface.

B.

Assign the VRF to the interface, and then reset the CE-to-PE routing protocol process.

C.

Shut the interface, assign the VRF to the interface, and then no shut the interface.

D.

Remove the IP address configuration on the interface, assign the VRF to the interface, and then reconfigure the IP address on the interface.

 

Answer: D

Explanation:http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.5/mpls/configuration/guide/gc35v3.ht ml#wp1080845

 

 

 

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C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 19

DRAG DROP

 

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Answer:

clip_image007

 

A.

 

B.

 

C.

 

D.

 

 

Answer:

 

 

QUESTION 20

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clip_image010

 

clip_image011

 

On PE7, how many multiprotocol IBGP routes are learned from PE8 and what is the next- hop IP address? (Choose two.)

 

A.

1

B.

2

C.

3

D.

10.8.1.1

E.

172.16.8.1

F.

192.168.108.81

 

Answer: BE

Explanation:Show ip bgp vpnv4 all — i tag field is the answer

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