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Exam : Cisco 642-611
Title : CCIP Implementing Cisco MPLS Exam (MPLS)

1. Refer to the diagram. What problem can be caused by the second P router summarizing the loopback address of the egress PE router?
A. The first P router will be faced with a VPN label which it does not understand.
B. The second P router will be faced with a VPN label which it does not understand.
C. The egress PE router will not be able to establish a label switch path (LSP) to the ingress PE router.
D. A label switch path (LSP) will be established from the ingress PE router to the egress PE router, an event that is not desirable.
E. The ingress PE router will not be able to receive the VPN label from the egress PE router via MP-IBGP.
Answer: B

2. Which three statements are correct regarding Layer 2 overlay VPNs and peer-to-peer VPNs? (Choose three.)
A. Peer-to-peer VPNs require the establishment of virtual circuits to connect the different customer sites together.
B. Peer-to-peer VPNs require the service provider to participate in the customer routing, accepting customer routes, transporting them across the service provider backbone, and finally propagating them to other customer sites.
C. With peer-to-peer VPNs, the service provider is responsible for transport of Layer 2 frames between customer sites, and the customer takes responsibility for all higher layers.
D. The implementation of Layer 2 overlay VPNs is the traditional switched-WAN model, implemented with technologies like X.25, Frame Relay or ATM.
E. With Layer 2 overlay VPNs, the service provider is not aware of customer routing and has no information about customer routes.
F. It is simple to implement Layer 2 overlay VPNs because the Customer Edge (CE) router just needs a connection to the Service Provider’s Provider Edge (PE) router.
Answer: BDE

3. Which type of VPN implementation is simple and cost effective because all sites connect only to the PE router and as a result optimum routing between sites is enabled by default?
A. peer-to-peer VPN
B. overlapping VPN
C. hub-and-spoke overlay VPN
D. fully-meshed overlay VPN
E. client-server VPN
Answer: A

4. For which purpose is the command mpls ldp maxhops used?
A. In large ATM-MPLS networks, the LFIB can become too large and it may be necessary to limit the maximum diameter of the MPLS LSPs.
B. Because downstream-on-demand label allocation uses hop count to control loop detection, it maybe necessary to limit the maximum diameter of the MPLS network.
C. Because end-to-end delay can cause problems with some voice applications, it may be necessary to limit the maximum diameter of the MPLS network.
D. When interconnecting large frame mode MPLS and cell mode networks it may be necessary to limit the maximum network diameter to prevent forwarding loops.
Answer: B

5. Refer to the diagram. How many VRF tables are needed to support three VPNs (Customer A, Customer B, and a VoIP VPN) with the following requirements:
A. 1 VRF
B. 3 VRFs
C. 4 VRFs
D. 5 VRFs
E. 7 VRFs
Answer: D

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