Download New Latest (May) Cisco 642-889 Actual Tests 21-30

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QUESTION 21

What are the two AToM interworking modes? (Choose two.)

 

A.

bridged (interworking ethernet)

B.

routed (interworking ip)

C.

label-switched (interworking mpls)

D.

transparent (interworking transparent)

 

Answer: AB

Explanation:http://www.cisco.com/en/US/docs/ios/ios_xe/mpls/configuration/guide/mp_l2vpn_intrntwkg_ xe.html

 

Interworking is a transforming function that is required to interconnect two heterogeneous attachment circuits (ACs). Several types of
interworking functions exist. The function that is used would depend on the type of ACs being used, the type of data being carried, and the level of functionality required. The two main Layer 2 Virtual Private Network (L2VPN) interworking functions supported in Cisco IOS XE software are bridged and routed interworking.

 

Layer 2 (L2) transport over multiprotocol label switching (MPLS) and IP already exists for like-to-like ACs, such as Ethernet-to-Ethernet or Point-to-Point Protocol (PPP)-to-PPP. L2VPN Interworking builds on this functionality by allowing disparate ACs to be connected. An interworking function facilitates the translation between different L2 encapsulations.

 

 

QUESTION 22

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.

 

clip_image001

 

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?

 

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.

 

Answer: C

 

 

QUESTION 23

Which BGP extended community is used to control the distribution of VPN routing information and to identify routers that may receive a set of routes that carry the community?

 

A.

SOO

B.

RT

C.

opaque

D.

route origin

E.

RD

 

Answer: B

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

 

Route Target is a 64-bits BGP community used for tagging prefixes. When exporting prefixes from the VRF, we add to the prefixes a Route-Target community, so when the PE in the remote site has to import prefixes into the VRF, it can easily identify which prefixes to import.

 

 

QUESTION 24

Refer to the exhibit.

 

 

 

clip_image002

 

Given the output shown, which two statements are true? (Choose two.)

 

A.

The configured remote AS for neighbor 10.1.1.1 is 1234.

B.

Both prefixes that are referenced by network commands will be visible with the show bgp command from the information that is shown in the output.

C.

The neighbor 10.1.1.1 cannot learn any routes from this router.

D.

The router cannot learn any routes for neighbor 10.1.1.1.

E.

Routes from the Internet VRF that are injected into BGP through redistribution will be advertised to neighbor 10.1.1.1.

 

Answer: AC

 

 

QUESTION 25

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

 

Answer: A

Explanation:

clip_image003

 

C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 26

In which configuration mode is a route distinguisher configured in a Cisco IOS XR router?

 

A.

config-vrf

B.

config-vrf-af

C.

config-bgp

D.

config-bgp-af

E.

config-bgp-vrf

 

Answer: E

Explanation:http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.6/routing/configuration/guide/rc36boo k.pdf

 

clip_image004

 

C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 27

Which three functions are performed by the PE router in an MPLS Layer 3 VPN? (Choose three.)

 

A.

exchanges routing updates with the CE router

B.

translates the CE routing information into VPNv4 routes

C.

exchanges VPNv4 routes with other PE routers over MP-BGP

D.

imports and exports RTs that are received from the P routers

E.

exchanges RDs with the P routers

F.

exchanges VPN labels with the CE routers

 

Answer: ABC

Explanation:http://www.cisco.com/en/US/docs/routers/crs/software/crs_r4.1/lxvpn/configuration/guide/vc 41v3.html

 

How MPLS L3VPN Works

MPLS VPN functionality is enabled at the edge of an MPLS network. The PE router performs the following tasks:

·Exchanges routing updates with the CE router

·Translates the CE routing information into VPN version 4 (VPNv4) and VPN version 6 (VPNv6) routes

·Exchanges VPNv4 and VPNv6 routes with other PE routers through the Multiprotocol Border Gateway Protocol (MP-BGP)

 

 

QUESTION 28

When implementing VPLS on Cisco routers, which data structure resembles a virtual switch and is used for learning the MAC addresses?

 

A.

VRF

B.

VFI

C.

SVI

D.

BVI

 

Answer: B

Explanation:

 

 

clip_image005

 

C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 29

Based on the Cisco IOS XR VRF configuration exhibit,

 

 

 

clip_image006

 

Which two data flows between the MPLS VPNs will be allowed? (Choose two.)

 

A.

The CustomerA central site can communicate with the CustomerB central site.

B.

The CustomerA central site can communicate with all CustomerA sites.

C.

The CustomerA central site can communicate with all CustomerB sites.

D.

The CustomerA sites can communicate with all CustomerB sites.

 

Answer: AB

 

 

QUESTION 30

Within the service provider IP/MPLS core network, what must be implemented to enable Layer 3 MPLS VPN services?

 

A.

IS-IS or OSPF on all the PE and P routers

B.

MP-BGP between the PE routers

C.

RSVP on all the PE and P routers

D.

targeted LDP between the PE routers

E.

LDP between the CE and PE routers

 

Answer: B

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