[Free] Download New Updated (December) Cisco 642-889 Exam Questions 31-40

By | December 4, 2015

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QUESTION 31

ACisco IOS XR router is acting as a PE and is running EIGRP as the CE-PE routing protocol. SOO must be configured. Under which subconfiguration mode should SOO be configured?

 

A.

RP/0/0/CPU0:XR1(config-eigrp)

B.

RP/0/0/CPU0:XR1(config-eigrp-vrf-af-if)

C.

RP/0/0/CPU0:XR1(config-eigrp-vrf)

D.

RP/0/0/CPU0:XR1(config-eigrp-vrf-af)

 

Correct Answer: B

 

 

QUESTION 32

Refer to the exhibit. XR2 must be configured with OSPF sham-link to PE1. Which configurationachieves this goal?

 

clip_image002

 

A.

router ospf 100

area 0

sham-link 11.11.11.11 33.33.33.33

B.

router ospf 100

vrf ABC

area 0

sham-link 33.33.33.33 11.11.11.11

C.

router ospf 100

area 0 sham-link 33.33.33.33 11.11.11.11

D.

router ospf 100

vrf ABC

area 0 sham-link 11.11.11.11 33.33.33.33

 

Correct Answer: B

 

 

QUESTION 33

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

 

Correct Answer: ABC

Explanation:

http://www.cisco.com/en/US/docs/routers/crs/software/crs_r4.1/lxvpn/configuration/guide/vc41v3.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 34

An engineer is deploying L2VPN service between two different Layer 2 encapsulations. Which feature should be set up to accomplish this task?

 

A.

interworking VLAN on both the provider edge routers

B.

interworking Ethernet on both the provider edge routers with VLAN tagging

C.

interworking IPv4 on both the customer edge routers

D.

interworking IPv4 on both the provider edge routers

 

Correct Answer: D

 

 

QUESTION 35

In Layer 3 MPLS VPN implementations, which protocol is used to carry the VPNv4 routes from PE to PE?

 

A.

RSVP

B.

IGP

C.

MP-BGP

D.

LDP

 

Correct Answer: C

 

 

 

 

 

 

 

QUESTION 36

When implementing CSC services, which two methods can be used to exchange label information between the downstream CSC customer carrier and the CSC backbone carrier? (Choose two.)

 

A.

using MP-BGP

B.

using RSVP

C.

using IGP and LDP

D.

using back-to-back VRF

E.

using front VRF and internal VRF

 

Correct Answer: AC

Explanation:

http://www.cisco.com/en/US/docs/net_mgmt/ip_solution_center/4.0/mpls/user/guide/9_iscqsg.html

 

Since the CSC-PE routers do not have to carry external routes in the VRF routing table, they can use the incoming label in the packet to forward the customer carrier Internet traffic. Adding MPLS to the routers provides a consistent method of transporting packets from the customer carrier to the backbone carrier. MPLS allows the exchange of an MPLS label between the CSC-PE and the CSC-CE routers for every internal customer carrier route. The routers in the customer carrier have all the external routes either through IBGP or route redistribution to provide Internet connectivity.

 

When a backbone carrier and the customer carrier both provide BGP/MPLS VPN services, the method of transporting data is different from when a customer carrier provides only ISP services. The following list highlights those differences.

 

When a customer carrier provides BGP/MPLS VPN services, its external routes are VPN- IPv4 routes. When a customer carrier is an ISP, its external routes are IP routes.

When a customer carrier provides BGP/MPLS VPN services, every site within the customer carrier must use MPLS. When a customer carrier is an ISP, the sites do not need to use MPLS.

 

 

QUESTION 37

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

 

Correct 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

 

clip_image004

clip_image006

 

Haven’t been able to find where MTU Must match

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QUESTION 38

Which VPN technology is an example of a full-mesh VPN?

 

A.

VTI

B.

GRE VPN

C.

Frame Relay L2 VPN

D.

MPLS L3VPN

 

Correct Answer: D

 

 

QUESTION 39

What is the primary difference between 6PE and 6VPE?

 

A.

6VPE does not require an MPLS core.

B.

6VPE requires an IPv6-aware core.

C.

6VPE provides IPv6 VPN services.

D.

6VPE tunnels IPv6 packets inside IPv4 packets.

 

Correct Answer: C

Explanation:

6PE is for transporting ipv6 natively and 6VPE is for ipv6 mpls vpns

 

 

QUESTION 40

Which Cisco IOS XR BGP configuration command is required to enable MP-BGP to carry IPv6 VPN routes?

 

A.

address-family ipv4 unicast

B.

address-family ipv6 unicast

C.

address-family vpnv4 unicast

D.

address-family vpnv6 unicast

 

Correct Answer: D

Explanation:

http://www.cisco.com/en/US/tech/tk872/technologies_configuration_example09186a0080b3e11d.shtml

 

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