NEW QUESTION 1
When is it appropriate to activate the VPNv6 address family?

• A. when implementing 6PE
• B. when running dual stack at the provider edge
• C. when implementing 6to4 tunneling
• D. when implementing 6VPE

Answer: D

NEW QUESTION 2
When implementing EoMPLS PWs, which configuration is optional?

• A. matching PW ID on both ends
• B. Xconnect
• C. Cisco Express Forwarding
• D. control word

Answer: D

Explanation:

NEW QUESTION 3
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

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.

NEW QUESTION 4
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

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 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 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.

NEW QUESTION 5
Which method is used to provide inter-AS AToM services?

• A. back-to-back VRF
• B. targeted LDP
• C. pseudowire stitching
• D. AToM interworking
• E. Cisco MPLS TE tunnels
• F. autodiscovery

Answer: C

Explanation: http://www.cisco.com/en/US/docs/optical/cpt/r9_3/configuration/guide/cpt93_configuration_chapter_0111.html

NEW QUESTION 6
Which type of VPN requires a full mesh of virtual circuits to provide optimal site-to-site connectivity?

• A. MPLS Layer 3 VPNs
• B. Layer 2 overlay VPNs
• C. GET VPNs
• D. peer-to-peer VPNs

Answer: B

Explanation:
http://etutorials.org/Networking/MPLS+VPN+Architectures/Part+2+MPLSbased+Virtual+Private+Networks/Chapter+7.+Virtual+Private+Network+VPN+Implementation+Options/Overlay+and+Peer-to-peer+VPN+Model/
Two VPN implementation models have gained widespread use:
The overlay model, where the service provider provides emulated leased lines to the customer.
The service provider provides the customer with a set of emulated leased lines. These leased lines are called VCs, which can be either constantly available {PVCs} or established on demand {SVCs}. The QoS guarantees in the overlay VPN model usually are expressed in terms of bandwidth guaranteed on a certain VC {Committed Information Rate or CIR} and maximum bandwidth available on a certain VC {Peak Information Rate or PIR}. The committed bandwidth guarantee usually is provided through the statistical nature of the Layer 2 service but depends on the overbooking strategy of the service provider The peer-to-peer model, where the service provider and the customer exchange Layer 3 routing information and the provider relays the data between the customer sites on the optimum path between the sites and without the customer's involvement. The peer-to-peer VPN model was introduced a few years ago to alleviate the drawbacks of the overlay VPN model. In the peer-to-peer model, the Provider Edge {PE} device is a router {PE-router} that directly exchanges routing information with the CPE router. The Managed Network service offered by many service providers, where the service provider also manages the CPE devices, is not relevant to this discussion because it's only a repackaging of another service. The Managed Network provider concurrently assumes the role of the VPN service provider {providing the VPN infrastructure} and part of the VPN customer role {managing the CPE device}. The peer-to-peer model provides a number of advantages over the traditional overlay model:
Routing {from the customer's perspective} becomes exceedingly simple, as the customer router exchanges routing information with only one {or a few} PE-router, whereas in the overlay VPN network, the number of neighbor routers can grow to a large number.
Routing between the customer sites is always optimal, as the provider routers know the customer's network topology and can thus establish optimum inter-site routing.
Bandwidth provisioning is simpler because the customer has to specify only the inbound and outbound bandwidths for each site {Committed Access Rate [CAR] and Committed Delivery Rate [CDR]} and not the exact site-to-site traffic profile.
The addition of a new site is simpler because the service provider provisions only an additional site and changes the configuration on the attached PE-router. Under the overlay VPN model, the service provider must provision a whole set of VCs leading from that site to other sites of the customer VPN.
Prior to an MPLS-based VPN implementation, two implementation options existed for the peer-to-peer VPN model: The shared-router approach, where several VPN customers share the same PE-router.
The dedicated-router approach, where each VPN customer has dedicated PE-routers.
Overlay VPN paradigm has a number of drawbacks, most significant of them being the need for the customer to establish point-to-point links or virtual circuits between sites. The formula to calculate how many point-to-point links or virtual circuits you need in the worst case is {{n}{n-1}}/2, where n is the number of sites you need to connect. For example, if you need to have full-mesh connectivity between 4 sites, you will need a total of 6 point-to-point links or virtual circuits. To overcome this drawback and provide the customer with optimum data transport across the Service Provider backbone, the peer-to-peer VPN concept was introduced where the Service Provider actively participates in the customer routing, accepting customer routes, transporting them across the Service Provider backbone and finally propagating them to other customer sites.

NEW QUESTION 7
When implementing VPLS on Cisco IOS XR routers, the VPLS PW neighbors can be statically defined under which configuration mode?

• A. bridge group
• B. bridge-domain
• C. vfi
• D. mpls ldp
• E. l2transport

Answer: C

Explanation:

NEW QUESTION 8
Refer to the Cisco IOS XR router output exhibit,

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

• A. 6PE
• B. 6VPE
• C. native IPv6
• D. native IPv4
• E. dual stack

Answer: B

Explanation: NOT SURE THIS MATCHES ANSWER

NEW QUESTION 9
Which service can be used to extend the same broadcast domain across the WAN to multiple customers?

• A. EVP-TREE
• B. E-LINE
• C. EPL
• D. EVPL

Answer: A

NEW QUESTION 10
Which three commands represent valid QoS classifiers of traffic in case of an EoMPLS circuit? {Choose three.}

• A. match cos
• B. match mpls experimental
• C. match qos-group
• D. match fr-de
• E. match protocol
• F. match ip address prefix-list
• G. match tag

Answer: ABC

NEW QUESTION 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.

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?

• A. The router eigrp command is referencing the wrong AS number.
• B. The redistribute eigrp command is missing the metric transparent option.
• C. The redistribute eigrp command is referencing the wrong AS number.
• D. The redistribute bgp command is missing the subnets option.
• E. The redistribute eigrp command is missing the subnets option.

Answer: C

NEW QUESTION 12
In Layer 3 MPLS VPN implementations, if a customer is using the same AS number at both customer sites and the PE- to-CE routing protocol is BGP, what must be enabled on the PE router?

• A. BGP AS override
• B. BGP allowas-in
• C. BGP SOO extended community
• D. BGP AS path prepending

Answer: A

Explanation: https://supportforums.cisco.com/docs/DOC-21837
Loop prevention in BGP is done by verifying the AS number in the AS Path. If the receiving router sees its own AS number in the AS Path of the received BGP packet, the packet is dropped. The receiving Router assumes that the packet was originated from its own AS and has reached the same place from where it originated initially.
The feature could be a disaster if customers are using same AS number along the various sites and disallows customer sites having identical AS numbers to be linked by another AS number. In such a scenario, routing updates from one site will be dropped when the other site receives them.
To override this feature, AS-Override function causes to replace the AS number of originating router with the AS number of the sending BGP router. The command is neighbor ip-address as-override and can only be executed under the VPNv4 address-family

NEW QUESTION 13
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

Answer: D

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

NEW QUESTION 14
Which VPN technology allows remote sites with dynamic IP addresses to connect to a central hub?

• A. static IPsec tunnels
• B. site-to-site VPN
• C. DMPVN
• D. VRFs

Answer: C

NEW QUESTION 15
Refer the exhibit.




On PE7, which three statements are correct regarding the MPLS VPN configurations used to support the connectivity between the CE7 and CE8 sites? {Choose three.}

• A. The RD is 1:1
• B. The import and export RTs are 1:1
• C. Interface GiO/0/0/0 is associated to the "default" VRF
• D. The network that connects PE7to CE7 is redistributed into multiprotocol IBGP
• E. The multiprotocol IBGP routes learned have a BGP origin code of "i"

Answer: BCE

Explanation: # show ip route show ip vrf
show ip vrf detail

NEW QUESTION 16
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

Answer: ABD

Explanation: