NO.1 A network engineer is tasked to implement an AToM VPN for a given customer to emulate a
Frame Relay virtual circuit over the MPLS-enabled core network. Which command enables Frame
Relay to forward frames from the attachment circuit over the emulated session in regular Cisco IOS
Software?
A. ip route 0.0.0.0 0.0.0.0 tailend_router_ip
B. encapsulation frame-relay
C. frame-relay switching
D. frame-relay intf-type dce
Answer: C

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NO.2 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?
A. The IOS XR device drops inbound routing updates on eBGP peers without an inbound route-policy.
B. The IOS XR devicerequires as-override on all eBGP customer peers.
C. The IOS XR devicerequires labeled-unicast peering sessions to eBGP customers.
D. The IOS XR devicedrops inbound routing updates on eBGP peers that do not send extended
communities.
Answer: A

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NO.3 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

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Explanation:
http://etutorials.org/Networking/MPLS+VPN+Architectures/Part+2+MPLSbased+Virtual+Pri
vate+Networks/Chapter+7.+Virtual+Private+Network+VPN+Implementation+Options/Overl
ay+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-topoint 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.

NO.4 Which two statements about implementing a separate MPLS VPN to provide customers
Internet access are correct? (Choose two.)
A. The Internet gateway router will act as a CE router.
B. Customers will use separate interfaces for VPN and Internet access.
C. Customers are assigned to the Internet VPN.
D. Internet routes will be leaked from the PE global routing table to the customer VRF.
Answer: A,C

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NO.5 Which technology does an N-PE most likely use to pass traffic to the U-PE that is destined for
the access switch?
A. pseudowire
B. MPLS TE
C. OSPF
D. IS-IS
Answer: A

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NO.6 Which Layer 2 protocol parameters can be carried inside the control word when implementing
AToM service?
A. PW ID
B. Frame Relay FECN, BECN, and DE bits
C. encapsulation type
D. VC type
Answer: B

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Explanation:
http://www.cisco.com/en/US/products/ps6603/products_qanda_item09186a008009d4e3.sh
tml#wp39173
Q. How does Frame Relay over MPLS work?
A. Traffic is encapsulated in MPLS packets and forwarded across the MPLS network. When
encapsulating Frame Relay over MPLS, the Frame Relay header and the frame check sequence (FCS)
are stripped from the packet. The bits for Backward Explicit Congestion Notification (BECN), Forward
Explicit Congestion Notification (FECN), Discard Eligibility (DE) and Command/Response (C/R) are
carried across the MPLS network in the "Control Word" header.

NO.7 A presale engineer is asked to advise about the various MPLS VPN designs to best fit the
customer requirements. Which two MPLS L2VPN features should be highlighted as advantages over a
MPLS L3VPN? (Choose two.)
A. An MPLS L2VPN design is a more appropriate solution for disaster recovery and data backup.
B. An MPLS L2VPN is a more redundant design compared to a MPLS L3VPN solution.
C. An MPLS L2VPN design does not require routing interaction with the service provider network.
D. An MPLS L2VPN design virtually extends the broadcast domain boundary allowing for the
customer IGP to fully interoperate between remote sites.
E. An MPLS L2VPN design does not require monitoring, which provides a significant cost-saving
solution.
Answer: C,D

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NO.8 An engineer is configuring VPLS BGP-based autodiscovery on a Cisco IOS XE PE router. Which
two configurations must be included for proper implementation? (Choose two.)
A. router bgp 61000 neighbor 172.16.10.2 remote-as 61000
B. router bgp 61000 address-family l2vpn vpls send-community extended
C. router bgp 61000 neighbor 172.16.10.2 remote-as 62000
D. router bgp 61000 address-family l2vpn vpls send-community-eBGP
E. l2vpn vfi context vpls1 autodiscovery bgp signaling ldp router bgp 61000 neighbor 172.16.10.2
remote-as 62000
F. l2vpn vfi context vpls1 autodiscovery bgp signaling ldp router bgp 61000 neighbor 172.16.10.2
remote-as 61000
Answer: A,B

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試験番号：642-889 トレーニング
試験科目：「Implementing Cisco Service Provider Next-Generation Egde Network Services」
最近更新時間：2015-07-05
問題と解答：126

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