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2017 Nov Cisco Official New Released 642-889
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Implementing Cisco Service Provider Next-Generation Egde Network Services

Question No: 11

Refer to the partial Cisco IOS XR PE router configuration exhibit for supporting a Layer 3 MPLS VPN customer using EIGRP AS 20 as the CE-to-PE routing protocol.

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The MPLS VPN customer is having problems receiving the EIGRP routes on the different customer site CE routers. What is wrong with this configuration that is causing the problem?

  1. The router eigrp command is referencing the wrong AS number.

  2. The redistribute eigrp command is missing the metric transparent option.

  3. The redistribute eigrp command is referencing the wrong AS number.

  4. The redistribute bgp command is missing the subnets option.

  5. The redistribute eigrp command is missing the subnets option.

Answer: C

Question No: 12

Based on the Cisco IOS XR VRF configuration exhibit,

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Which two data flows between the MPLS VPNs will be allowed? (Choose two.)

  1. The CustomerA central site can communicate with the CustomerB central site.

  2. The CustomerA central site can communicate with all CustomerA sites.

  3. The CustomerA central site can communicate with all CustomerB sites.

  4. The CustomerA sites can communicate with all CustomerB sites.

Answer: A,B

Question No: 13

Which VPN technology uses the Group Domain of Interpretation as the keying protocol and IPsec for encryption that is often deployed over a private MPLS core network?

  1. DMVPN

  2. GET VPN

  3. SSL VPN

  4. L2TPv3

Answer: B Explanation:

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6635/ps7180/deploy ment_guide_c07_554713.html

Question No: 14

Which option is the correct command to define an interface as Layer 2 on the Cisco ASR 9000?

  1. RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 l2transport

  2. RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 layer2

  3. RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 switchport

  4. RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 xconnect

Answer: A

Question No: 15

In which Cisco IOS XR configuration mode is the redistribute static command applied to enable the redistribution of static VRF routes between the PE routers?

  1. RP/0/RP0/CPU0:PE(config-router)#

  2. RP/0/RP0/CPU0:PE(config-bgp)#

  3. RP/0/RP0/CPU0:PE(config-bgp-vrf)#

  4. RP/0/RP0/CPU0:PE(config-bgp-vrf-af)#

Answer: D Explanation:

http://www.cisco.com/en/US/docs/routers/asr9000/software/routing/configuration/guide/rcas r9kstat.html#wp1041359

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Question No: 16

A customer has two sites over an MPLS cloud with Ethernet connections and requires one STP domain to be transparent over the MPLS provider. Which label-switching technology can the provider use without getting involved in learning the customer MAC addresses?

  1. L2TPV3

  2. EoMPLS

  3. VPLS

  4. H-VPLS

Answer: B

Question No: 17

Which Layer 2 VPN technology is implemented over an IP core network without the need for MPLS?

  1. VPLS

  2. VPWS

  3. AToM

  4. L2TPv3

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:

鈥2TPv3 simplifies deployment of VPNs

鈥2TPv3 does not require Multiprotocol Label Switching

鈥2TPv3 supports Layer 2 tunneling over IP for any payload

Question No: 18

An engineer is configuring an EoMPLS circuit on a Cisco IOS XR router interface that removes a VLAN from the distribution layer. Which configuration accomplishes this configuration?

  1. interface GigabitEthernet 0/10.10 l2transport encapsulation dot1q 10

    l2vpn

    xconnect group 103588

    p2p 103588

    interface GigabitEthernet 2/10.10 neighbor ipv4 10.10.10.2 pw-id 103588

  2. interface GigabitEthernet 0/10.10 encapsulation dot1q 10

    rewrite ingress tag pop 1 symmetric l2vpn

    xconnect group 103588

    p2p 103588

    interface GigabitEthernet 0/10.10 neighbor ipv4 10.10.10.2 pw-id 103588

  3. interface GigabitEthernet 0/10.10 l2transport encapsulation dot1q 10

    rewrite ingress tag pop 1 symmetric l2vpn

    xconnect group 103588

    p2p 103588

    interface GigabitEthernet 0/10.10 neighbor ipv4 10.10.10.2 pw-id 103588

  4. interface GigabitEthernet 0/10.10 l2transport encapsulation dot1q 10

rewrite ingress tag translate 1-to-1 dot1ad 10 symmetric

l2vpn

xconnect group 103588

p2p 103588

interface GigabitEthernet 0/10.10 neighbor ipv4 10.10.10.2 pw-id 103588

Answer: C

Question No: 19

Refer to the exhibit.

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PE1 and PE2 are advertising the same subnet 10.10.10.0/24 to PE3. Which PE advertised subnet is installed at the PE3 XYZ BGP table?

  1. PE2 subnetbecause it has the same RD value as PE3

  2. PE2 subnet because it has the same export RT value as export RT on PE3

  3. PE1 subnetbecause it has the same RD value as PE3

  4. PE1 subnet because it has the same export RT value as import RT on PE3

Answer: D

Question No: 20

A routing entry on a PE router has an ext-hop address of ::ffff:[IP ADDRESS]. Which service provider technology is being deployed?

  1. 6VPE

  2. 6PE

  3. 4to6 tunnel

  4. 6to4 tunnel

Answer: B

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