[Free] Download New Updated (December) Cisco 642-889 Exam Questions 51-60

By | December 4, 2015

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QUESTION 51

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.

 

Correct Answer: C

 

 

QUESTION 52

Which MP-BGP address family must be configured to use VPLS autodiscovery in a Cisco IOS XR router?

 

A.

address-family l2vpn vpls-vpws

B.

address-family vpnv4 unicast

C.

address-family ipv4 mdt

D.

address-family ipv4 tunnel

E.

address-family vpls vfi

 

Correct Answer: A

Explanation:

http://www.cisco.com/en/US/docs/ios/12_2sr/12_2srb/feature/guide/srbgpl2v.html

 

 

QUESTION 53

Which protocol is used to hide customer VLANs inside the provider backbone network?

 

A.

802.1ap

B.

802.1x

C.

802.1ad

D.

802.1q

 

Correct Answer: C

 

 

QUESTION 54

A service provider wants to scale MAC address advertisements in its next generation E-LAN and E-TREE designs. Which technology can be used in the service provider cloud to reach this goal?

 

A.

PBB EVPN

B.

VPLS

C.

802.1Q

D.

802.3ad

 

Correct Answer: A

 

 

QUESTION 55

Which two MPLS QoS models described by RFC3270 are used for CE-PE QoS implementation? (Choose two.)

 

A.

best effort

B.

pipe

C.

uniform

D.

integrated services

E.

differentiated services

 

Correct Answer: BC

 

 

QUESTION 56

In Layer 3 MPLS VPN implementations, if some of the VPNv4 routes on one PE router do not appear on another PE router, what could be the problem?

 

A.

RD mismatch between the PE routers

B.

RT export and import configuration errors

C.

RD export and import configuration errors

D.

VRF name mismatch between the PE routers

 

Correct Answer: B

Explanation:

http://blog.initialdraft.com/archives/1537/

 

 

QUESTION 57

Which three security features can be implemented on PEs insidea Cisco IOS XR VPLS environment? (Choose three.)

 

A.

MAC flooding

B.

neighbor VC storm-control

C.

interface storm-control

D.

MAC learning

E.

DHCP snooping

F.

MAC withdrawal

 

Correct Answer: ABC

 

 

QUESTION 58

Refer to the partial Cisco IOS XR PE router configuration exhibit for supporting a Layer 3 MPLS VPN customer using EIGRP AS 20 as the CE-to-PE routing protocol. The MPLS VPN customer is having problems receiving the EIGRP routes on the different customer site CE routers. What is wrong with this configuration that is causing the problem?

 

clip_image002

 

A.

The router eigrp command is referencing the wrong AS number.

B.

The redistribute eigrp command is missing the metric transparent option.

C.

The redistribute eigrp command is referencing the wrong AS number.

D.

The redistribute bgp command is missing the subnets option.

E.

The redistribute eigrp command is missing the subnets option.

 

Correct Answer: C

 

 

QUESTION 59

A customer has two sites over an MPLS cloud with Ethernet connections and requires one STP domain to be transparent over the MPLS provider. Which label-switching technology can the provider use without getting involved in learning the customer MAC addresses?

 

A.

L2TPV3

B.

EoMPLS

C.

VPLS

D.

H-VPLS

 

Correct Answer: B

 

 

 

 

 

 

 

QUESTION 60

Refer to the partial Cisco IOS XR PE router VRF configuration exhibit. To implement a central-service VPN supporting both customer1 and customer2, what will be the required corresponding VRF configuration on the central-service-server PE router?

 

clip_image004

 

A.

vrf central-service-server

address-family ipv4 unicast

import route-target

3:1

2:2

export route-target

3:1

2:1

!

B.

vrf central-service-server

address-family ipv4 unicast

import route-target

3:1

2:1

export route-target

3:1

2:2

!

C.

vrf central-service-server

address-family ipv4 unicast

import route-target

3:1

1:1

1:2

export route-target

3:1

1:1

1:2

!

D.

vrf central-service-server

address-family ipv4 unicast

import route-target

3:1

1:1

1:2

2:1

2:2

export route-target

3:1

1:1

1:2

2:1

2:2

!

 

Correct Answer: A

&n
bsp;

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