[Free] Download New Updated (December) Cisco 642-889 Exam Questions 71-80

By | December 4, 2015

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QUESTION 71

Refer to the exhibit. PE1 and PE2 are advertising the same subnet 196.168.10.0/24 to PE3. Which PE advertised subnet is installed at PE3 BGP table?

 

clip_image002

 

A.

PE2 subnet only due to the same RD value with PE1

B.

PE2 subnet only due to the same RD value with PE3

C.

Both PE1 and PE2 subnets due to exported subnet with RT matches import RT on PE3

D.

PE1 subnet only due to exported subnet with RT matches import RT on PE3

 

Correct Answer: D

 

 

QUESTION 72

A presale engineer is asked to advise about the various MPLS VPN designs to best fit the customer requirements. Which two MPLS L2VPN features should be highlighted as advantages over a MPLS L3VPN? (Choose two.)

 

A.

An MPLS L2VPN design is a more appropriate solution for disaster recovery and data backup.

B.

An MPLS L2VPN is a more redundant design compared to a MPLS L3VPN solution.

C.

An MPLS L2VPN design does not require routing interaction with the service provider network.

D.

An MPLS L2VPN design virtually extends the broadcast domain boundary allowing for the customer IGP to fully interoperate between remote sites.

E.

An MPLS L2VPN design does not require monitoring, which provides a significant cost- saving solution.

 

Correct Answer: CD

QUESTION 73

The Cisco IOS XR address-family ipv4 labeled-unicast and the Cisco IOS/IOS XE neighbor send-label commands are used in which MPLS implementation?

 

A.

Cisco MPLS TE

B.

CSC using MP-BGP for label exchange

C.

back-to-back VRF

D.

AToM

E.

VPLS

 

Correct Answer: B

Explanation:

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fscscleb.pdf

 

The MPLS VPN–Carrier Supporting Carrier–IPv4 BGP Label Distribution feature lets you configure your carrier-supporting-carrier network to enable Border Gateway Protocol (BGP) to transport routes and Multiprotocol Label Switching (MPLS) labels between the backbone carrier provider edge (PE) routers and the customer carrier customer edge (CE) routers using multiple paths. Previously, you had to use Label Distribution Protocol (LDP) to carry the labels and an Internal Gateway Protocol (IGP) to carry the routes between PE and CE routers to achieve the same goal.

 

The benefits of using BGP to distribute IPv4 routes and MPLS label routes are:

BGP takes the place of an IGP and LDP in a Virtual Private Network (VPN) forwarding/routing instance (VRF) table. You can use BGP to distribute routes and MPLS labels. Using a single protocol instead of two simplifies the configuration and troubleshooting.

BGP is the preferred routing protocol for connecting two Internet service providers (ISPs), mainly because of its routing policies and ability to scale. ISPs commonly use BGP between two providers.

 

This feature enables those ISPs to use BGP.

 

 

QUESTION 74

When using H-VPLS, the PE router may use an IRB interface. How many VLAN tags can be processed by an IRB?

 

A.

0

B.

1

C.

2

D.

3

 

Correct Answer: A

 

 

QUESTION 75

Which CE-to-PE routing protocol implements the down bit as a loop prevention mechanism?

 

A.

RIPv2

B.

EIGRP

C.

IS-IS

D.

OSPF

E.

BGP

 

Correct Answer: D

Explanation:

https://www.racf.bnl.gov/Facility/TechnologyMeeting/Archive/06-30-04-CISCO/Using-OSPF-in-MPLS-VPNEnvironment.pdf

 

clip_image004

 

 

QUESTION 76

On Cisco IOS and IOS XE Layer 3 MPLS VPN implementations, when redistributing the customer RIP routes into MP-BGP, the RIP metric is copied into which BGP attribute?

 

A.

local preference

B.

weight

C.

MED

D.

extended community

 

Correct Answer: C

Explanation:

https://supportforums.cisco.com/thread/191993

Use the red bgp <asn> metric transparent command to preserve the RIP metrics. When RIP routes are redistributed into BGP, the route metric is stored in the BGP MED value. When BGP routes are redistributed into RIP, and the transparent keyword used, the MED value is copied back as the RIP metric. Without the transparent keyword, the metric value specified is applied to all the routes.

 

 

QUESTION 77

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

 

Correct Answer: ABD

 

 

QUESTION 78

VPWS/EoMPLS offers which type of Ethernet services as defined by the MEF?

 

A.

E-Tree

B.

E-LAN

C.

E-Line

D.

E-Interworking

 

Correct Answer: C

Explanation:

E-Line is based on a point-to-point Ethernet Virtual Connection. Two E-Line services are defined:

Ethernet Private Line (EPL): A very simple and basic point-to-point service characterized by low frame delay, frame delay variation, and frame loss ratio. No service multiplexing is allowed, and other than a committed information rate (CIR) no class of service (CoS) (Bandwidth Profiling) is allowed.

Ethernet Virtual Private Line (EVPL): A point-to-point service wherein service multiplexing (more than one
Ethernet Virtual Connection) is allowed. The individual Ethernet Virtual Circuits can be defined with a rich set of Bandwidth Profiles and Layer 2 Control Protocol Processing methods as defined by the Metro Ethernet Forum.

 

 

QUESTION 79

A network engineer is tasked to implement an AToM VPN for a given customer to emulate a Frame Relay virtual circuit over the MPLS-enabled core network. Which command enables Frame Relay to forward frames from the attachment circuit over the emulated session in regular Cisco IOS Software?

 

A.

ip route 0.0.0.0 0.0.0.0 tailend_router_ip

B.

encapsulation frame-relay

C.

frame-relay switching

D.

frame-relay intf-type dce

Correct Answer: C

 

 

QUESTION 80

In MPLS Layer 3 VPN implementations, what is used on the PE router to isolate potential overlapping routing information between different customers?

 

A.

route targets

B.

VRFs

C.

VC IDs

D.

pseudowire IDs

E.

pseudowire classes

 

Correct Answer: B

 

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