Download New Latest (May) Cisco 642-889 Actual Tests 31-40

By | May 17, 2015

Ensurepass

 

QUESTION 31

When using the Cisco EVC software infrastructure, a double-tagged frame with a customer VLAN of 10 and a service provider VLAN of 150 will be best matched by which encapsulation configuration?

 

A.

encapsulation dot1q 10 second-dot1q any

B.

encapsulation dot1q 10 second-dot1q 150

C.

encapsulation dot1q 10 second-dot1q 50-200

D.

encapsulation dot1q 10

E.

encapsulation dot1q 150

 

Answer: E

 

 

QUESTION 32

When troubleshooting EoMPLS configuration problems, which three parameters must match between the two ends of the pseudowire configurations? (Choose three.)

 

A.

control word usage

B.

MTU size

C.

pseudowire ID

D.

Xconnect group name

E.

EFP subinterface number

 

Answer: ABC

Explanation:Provisioning an AToM Static Pseudowire

In this configuration task, you use options in the xconnect Ethernet interface configuration command to specify a static connection, and mpls commands in xconnect mode to statically set the following pseudowire parameters:

·Set the local and remote pseudowire labels

·Enable or disable sending the MPLS control word

 

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C:Documents and Settingsuser-nwzDesktop1.JPG

 

clip_image002

 

C:Documents and Settingsuser-nwzDesktop1.JPG

 

Haven’t been able to find where MTU Must match

 

 

QUESTION 33

With Layer 3 MPLS VPN implementations on Cisco IOS XR PE routers, an interface is as
signed to a VRF using the vrf command in which configuration mode?

 

A.

RP/0/RP0/CPU0:PE(config-vrf)#

B.

RP/0/RP0/CPU0:PE(config-if)#

C.

RP/0/RP0/CPU0:PE(config-bgp)#

D.

RP/0/RP0/CPU0:PE(config-bgp-af)#

 

Answer: B

Explanation:

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C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 34

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clip_image005

 

 

 

clip_image006

 

On PE7, what is the pseudowire ID that connects to the 10.8.1.1 neighbor?

 

A.

70

B.

80

C.

123

D.

0x840001

E.

0x4000080

 

Answer: C

 

 

QUESTION 35

When implementing MPLS Layer 3 VPNs with customers running OSPF as the CE-PE routing protocol, which situation will require a sham link to be implemented in the MPLS backbone?

 

A.

to connect customer sites in different OSPF areas

B.

to connect customer sites in the same OSPF area

C.

to prevent OSPF routing loops when a customer site has redundant CE-PE connections

D.

if there is a backdoor link between the CE routers, to ensure that the backdoor link is used only to back up the primary connection through the MPLS VPN

 

Answer: D

Explanation:http://www.cisco.com/en/US/docs/ios/12_2t/12_2t8/feature/guide/ospfshmk.html

 

 

QUESTION 36

Refer to the partial Cisco IOS XR PE router VRF configuration exhibit.

 

clip_image007

 

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?

 

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

!

 

Answer: A

 

 

QUESTION 37

When configuring VPLS on the Cisco ASR 9000, which three configurations are required under the l2vpn configuration mode? (Choose three.)

 

A.

bridge-group

B.

bridge-domain

C.

xconnect

D.

vfi

E.

encapsulation

 

Answer: ABD

Explanation:

C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

 

clip_image008

 

C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 38

Which two statements about implementing a separate MPLS VPN to provide customers Internet access are correct? (Choose two.)

 

A.

The Internet gateway router will act as a CE router.

B.

Customers will use separate interfaces for VPN and Internet access.

C.

Customers are assigned to the Internet VPN.

D.

Internet routes will be leaked from the PE global routing table to the customer VRF.

 

Answer: AC

 

 

QUESTION 39

Which Layer 2 VPN technology is implemented over an IP core network without the need for MPLS?

 

A.

VPLS

B.

VPWS

C.

AToM

D.

L2TPv3

 

Answer: D

Explanation:http://www.cisco.com/en/US/docs/ios/12_3t/12_3t2/feature/guide/gtl2tpv3.html#wp1040784

 

 

 

The Layer 2 Tunnel Protocol Version 3 feature expands on Cisco support of the Layer 2 Tunnel Protocol Version 3 (L2TPv3). L2TPv3 is an Internet Engineering Task Force (IETF) l2tpext working group draft that provides several enhancements to L2TP for the capability to tunnel any Layer 2 payload over L2TP.

 

Specifically, L2TPv3 defines the L2TP protocol for tunneling Layer 2 payloads over an IP core network using Layer 2 virtual private networks (VPNs). Benefits of this feature include the following:

·L2TPv3 simplifies deployment of VPNs

·L2TPv3 does not require Multiprotocol Label Switching ·L2TPv3 supports Layer 2 tunneling over IP for any payload

 

 

QUESTION 40

When implementing VPLS on Cisco IOS XR routers, the VPLS PW neighbors can be statically defined under which configuration mode?

 

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bridge group

A.

B.

bridge-domain

C.

vfi

D.

mpls ldp

E.

l2transport

 

Answer: C

Explanation:

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C:Documents and Settingsuser-nwzDesktop1.JPG

 

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