[Free] 2017(Oct) EnsurePass Testking Cisco 642-889 Dumps with VCE and PDF 71-80

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Implementing Cisco Service Provider Next-Generation Egde Network Services

Question No: 71

On Cisco IOS XR platforms using the EVC infrastructure, which command is used to enable a Layer 2 VPN subinterface?

  1. interface gi0/0/0/0.10 switchport access vlan 10

  2. interface gi0/0/0/0.10

    switchport mode tunnel dot1q-tunnel

  3. interface gi0/0/0/0.10 switchport mode trunk

  4. interface gi0/0/0/0.10 bridge-group 10

  5. interface gi0/0/0/0.10 l2transport

Answer: E

Question No: 72

Implementing H-VPLS instead of VPLS reduces which requirement?

  1. having a full mesh of PWs between all the PE routers in the service provider MPLS core

  2. having a full mesh of PWs between all the UPE routers

  3. having to implement QinQ tagging between the UPE and the NPE

  4. having to implement MPLS LDP between the UPE and the NPE

  5. the overhead of using BGP or LDP autodiscovery

Answer: A

Question No: 73

Refer to the exhibit.

Ensurepass 2017 PDF and VCE

A customer wants to deploy an IPv6 VPN network over the MPLS provider.Which option describes what must be enabled on the MPLS provider to support this request?

  1. IPv6 should be deployed inside the core network of the provider.

  2. LDP also should be configured to provide labels for IPv6 routes.

  3. MP-iBGP VPNv6 session should be configured with current IPv4 addresses.

  4. MP-iBGP IPv6 session should be configured with current IPv4 addresses.

Answer: C

Question No: 74

A customer is connecting toa Cisco IOS XR PE device via BGP. The peering session is up and the customer is advertising routes, but the provider is not receiving any. Which issue is the most likely cause?

  1. The IOS XR device drops inbound routing updates on eBGP peers without an inbound route-policy.

  2. The IOS XR devicerequires as-override on all eBGP customer peers.

  3. The IOS XR devicerequires labeled-unicast peering sessions to eBGP customers.

  4. The IOS XR devicedrops inbound routing updates on eBGP peers that do not send extended communities.

Answer: A

Question No: 75

Which technology does an N-PE most likely use to pass traffic to the U-PE that is destined for the access switch?

  1. pseudowire

  2. MPLS TE

  3. OSPF

  4. IS-IS

Answer: A

Question No: 76

Which two methods can be used for VPLS PW signaling? (Choose two.)

  1. static

  2. BGP

  3. IGP

  4. LDP

  5. RSVP

Answer: B,D

Question No: 77

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

  1. exchanges routing updates with the CE router

  2. translates the CE routing information into VPNv4 routes

  3. exchanges VPNv4 routes with other PE routers over MP-BGP

  4. imports and exports RTs that are received from the P routers

  5. exchanges RDs with the P routers

  6. exchanges VPN labels with the CE routers

Answer: A,B,C 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:

鈥xchanges routing updates with the CE router

鈥ranslates the CE routing information into VPN version 4 (VPNv4) and VPN version 6 (VPNv6) routes

鈥xchanges VPNv4 and VPNv6 routes with other PE routers through the Multiprotocol Border Gateway Protocol (MP-BGP)

Question No: 78

Which service can be used to extend the same broadcast domain across the WAN to multiple customers?

  1. EVP-TREE

  2. E-LINE

  3. EPL

  4. EVPL

Answer: A

Question No: 79

In Layer 3 MPLS VPN implementations, if some of the VPNv4 routes on one PE router do not appear on another PE router, what could be the problem?

  1. RD mismatch between the PE routers

  2. RT export and import configuration errors

  3. RD export and import configuration errors

  4. VRF name mismatch between the PE routers

Answer: B Explanation:

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

Question No: 80

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

  1. RIPv2

  2. EIGRP

  3. IS-IS

  4. OSPF

  5. BGP

Answer: D Explanation:

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

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