642-889 Latest Exam (Aug 2018)

[Free] 2018(Aug) Dumps4cert Cisco 642-889 Dumps with VCE and PDF Download 21-30

August 19, 2018

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Implementing Cisco Service Provider Next-Generation Egde Network Services

Question No: 21

Which option describes what differentiates a U-PE from N-PE?

  1. U-PE has all BGP routes from different BGP AFIs.

  2. N-PE has VRF configured and exported via BGP.

  3. U-PE is configured to peer BGP with all other BGP neighbors.

  4. N-PE is used to physically connect customer edge routers.

Answer: A

Question No: 22

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Dumps4Cert 2018 PDF and VCE

Dumps4Cert 2018 PDF and VCE

Dumps4Cert 2018 PDF and VCE

On PE7, which interface connects to the CE7 and what is the name of the VRF that interface is associated to? (Choose two.)

A. Gi0/0/0/0 B. Gi0/0/0/1 C. Gi0/0/0/2

  1. Customer_1

  2. Customer_A

  3. Customer_CE7

Answer: B,C Explanation:

#show ip vrf interfaces

Question No: 23

When implementing VPLS on Cisco IOS XR routers, the VPLS PW neighbors can be statically defined under which configuration mode?

  1. bridge group

  2. bridge-domain

  3. vfi

  4. mpls ldp

  5. l2transport

Answer: C

Question No: 24

When implementing MPLS Layer 3 VPN services, which CE-PE routing method does not require the use of the redistribute command to enable the customer routes to be advertised through the MPLS cloud between the customer sites?

  1. EIGRP

  2. OSPF

  3. IS-IS

  4. BGP

  5. static routing

  6. OSPF or IS-IS

Answer: D

Question No: 25

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

  1. 6VPE does not require an MPLS core.

  2. 6VPE requires an IPv6-aware core.

  3. 6VPE provides IPv6 VPN services.

  4. 6VPE tunnels IPv6 packets inside IPv4 packets.

Answer: C Explanation:

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

Question No: 26

A network engineer is troubleshooting an MPLS Layer 3 VPN and discovers that routes are being learned by CE routers, but there is no IP connectivity. Which option is the most likely cause?

  1. The provider does not have an end-to-end label switch path.

  2. The customer does not have an end-to-end label switch path.

  3. The customer is not sharing labels with the provider.

  4. The provider is not sharing labels with the customer.

  5. The providers PE to CE routing protocol is misconfigured.

  6. The customers PE to CE routing protocol is misconfigured.

Answer: A

Question No: 27

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Dumps4Cert 2018 PDF and VCE

Dumps4Cert 2018 PDF and VCE

On PE7, what is the pseudowire ID that connects to the neighbor?

  1. 70

  2. 80

C. 123

D. 0x840001

E. 0x4000080

Answer: C

Question No: 28

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?

  1. Cisco MPLS TE

  2. CSC using MP-BGP for label exchange

  3. back-to-back VRF

  4. AToM

  5. VPLS

Answer: B Explanation:


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 No: 29

    Refer to the Cisco IOS XR router output exhibit,

    Dumps4Cert 2018 PDF and VCE

    which method is being used to transport IPv6 traffic over the service provider network?

    1. 6PE

    2. 6VPE

    3. native IPv6

    4. native IPv4

    5. dual stack

    Answer: B Explanation:


    Dumps4Cert 2018 PDF and VCE

    Question No: 30

    Which organization provides and promotes a standards-based description of service provider services offering?

    1. MEF

    2. IETF

    3. IEEE

    4. ITU

    Answer: A

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