[Free] Download New Updated (December) Cisco 642-889 Exam Questions 21-30

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QUESTION 21

When verifying Layer 3 MPLS VPN operations, which Cisco IOS XR show command is best used to verify that the PE router is receiving the routes from the CE router?

 

A.

show route

B.

show route vrf vrf-name

C.

show bgp vpnv4 vrf vrf-name

D.

show bgp vpnv4 unicast ip-prefix

 

Correct Answer: B

Explanation:

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.7/routing/configuration/guide/rc37rib.html

 

QUESTION 22

Which two Layer 2 VPN methods support interworking between customer sites with different Layer 2 encapsulation at each end (for example, Frame Relay to Ethernet interworking)? (Choose two.)

 

A.

AToM

B.

VPLS

C.

GET VPN

D.

L2TPv3

 

Correct Answer: AD

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 L
2TP 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

http://www.cisco.com/en/US/products/ps6646/products_ios_protocol_option_home.html

 

Cisco Any Transport over MPLS (AToM) is a solution for transporting Layer 2 packets over an MPLS backbone. It enables Service Providers to supply connectivity between customer sites with existing data link layer (Layer 2) networks via a single, integrated, packet-based network infrastructure: a Cisco MPLS network. Without separate networks that each have network management environments, Service Providers can deliver Layer 2 connections over an MPLS backbone.

 

Cisco AToM provides a common framework to encapsulate and transport supported Layer 2 traffic types over an MPLS network core. Service Providers can use a single MPLS network infrastructure to offer connectivity for supported Layer 2 traffic and for IP traffic in Layer 3 VPNs.

 

 

QUESTION 23

Which Layer 2 encapsulations can AToM solution support with interworking IP feature enable?

 

A.

Ethernet to ATM AAL5

B.

ATM AAL5 to Frame Relay

C.

PPP to Frame Relay

D.

multipoint PPP to Frame Relay

 

Correct Answer: A

 

 

 

 

 

 

 

QUESTION 24

Whichthree possible misconfigurations can occur on the backbone IGP section of an MPLS Layer 3 VPN setup? (Choose three.)

 

A.

configuring the LDP router ID with an incorrect loopback interface

B.

configuring the wrong AS number on a client eBGP peering

C.

configuring the wrong area number on a PE-CE OSPF link

D.

decreasing the MPLS MTU

E.

disabling MPLS on a core link

F.

disabling MPLS LDP sync in the IGP routing process

 

Correct Answer: ADE

 

 

QUESTION 25

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

 

Correct 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 26

A PE configured with VRF ABC needs to export only subnet 1.1.1.1/32 with RT 100:100 without losing its original RT 200:200 to a remote PE. Which configuration is correct?

 

A.

clip_image002

B.

clip_image004

C.

clip_image006

D.

clip_image008

 

Correct Answer: C

 

 

QUESTION 27

Refer to the exhibit. PE1 and PE2 are advertising the same subnet 10.10.10.0/24 and export route-target to PE3. Which PE advertised subnet is installed at the PE3 BGP table?

 

clip_image010

 

A.

PE1 subnet only, due to higher BGP assigned weight.

B.

PE2 subnet only because it is a member in the same VRF.

C.

PE1 and PE2 subnets

D.

PE1 and PE2 subnets as 300:300:10.10.10.0/24

 

Correct Answer: C

 

 

 

 

 

 

QUESTION 28

When implementing Layer 3 MPLS VPNs on Cisco IOS/IOS XE PE routers, which PE-to- CE routing protocol requires a separate routing process to be created for each VRF?

 

A.

EIGRP

B.

RIPv2

C.

OSPF

D.

BGP

 

Correct Answer: C

 

 

QUESTION 29

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)

 

Correct 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 30

DRAG DROP

clip_image012

 

Correct Answer:

clip_image014

 

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