CCIP 642-611 MPLS Real Exam Questions

The Implementing Cisco MPLS (MPLS) exam is a qualifying exam for the Cisco Certified Internetwork Professional certification. The 642-611 MPLS exam will test materials covered under the Implementing Cisco MPLS course. The exam will certify that the successful candidate has knowledge and skills necessary to gather information from the technology basics to some of the more updated features and functions such as Traffic Engineering, Fast Reroute and any Transport over MPLS (AToM). The exam covers topics on MPLS Concepts, MPLS Label Assignment and Distribution, Frame-Mode/Cell-Mode MPLS Implementation on Cisco IOS Platforms, MPLS Virtual Private Networks Technology, MPLS VPN Implementation, Complex MPLS VPNs, and Internet Access from a MPLS VPN.

1: What is a benefit of CEF switching?
A.CEF supports IP source prefix-based switching using the FIB.
B.CEF uses less memory than fast switching uses.
C.CEF is less CPU intensive than fast switching is.
D.CEF provides Netflow statistics with minimum CPU overhead.
E.CEF allows multiple data planes to share a common control plane.
Correct Answers: C

2: What is a major drawback of using traditional IP routing over an ATM network when connecting multiple sites?
A.Each ATM switch in the path has to perform Layer 3 routing lookup.
B.ATM virtual circuits have to be established between the different sites.
C.There is high ATM management overhead between the ATM switch and the router at each site.
D.Each ATM switch has to be manually configured to participate in Layer 3 routing.
E.There is high PNNI overhead.
Correct Answers: B

3: 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.
Correct Answers: B

4: When nonadjacent LDP neighbors are used for implementing an MPLS traffic engineering solution, how are the nonadjacent LDP neighbors discovered?
A.using multicast CR-LSP (constraint-based LSP)
B.using unicast CR-LSP (constraint-based LSP)
C.using multicast LDP hello messages
D.using unicast LDP hello messages
E.using multihop MP-IBGP
F.using multihop MP-EBGP
Correct Answers: D

5: What best describes the following configuration example of allowas-in? router bgp 100 address-family ipv4 vrf CustomerAneighbor remote-as 123 neighbor activateneighbor allowas-in 2
A.permits incoming BGP updates defined by access-list 2
B.permits incoming BGP updates defined by class-map 2
C.permit incoming BGP updates defined by route-map 2
D.permits incoming BGP updates with no more than two occurrences of AS 100 in the AS path
E.permits incoming BGP updates with no more than two occurrences of AS 123 in the AS path
Correct Answers: D

6: What is the difference in implementation between a managed CE services MPLS VPN and a central services MPLS VPN?
A.RD assignment
B.selective routes export
C.selective routes import
D.MP-BGP route redistribution filtering
E.CE-PE routing process
Correct Answers: B

7: 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.
Correct Answers: B D E

8: With MPLS VPNs, if the CE-PE routing protocol is BGP, which statement below is true?
A.The different customer sites must use different autonomous system numbers.
B.Manual route redistribution between EBGP and MP-BGP is required.
C.The SOO extended BGP community can be used to prevent routing loops.
D.A BGP virtual sham-link is required between the customer site's CE routers to ensure optimal routing between the customer sites.
E.The customer's autonomous system number must match the MPLS VPN service provider's autonomous system number.
Correct Answers: C

9: Which kind of link does a Layer 3 overlay VPN use?
A.emulated point-to-point
B.dedicated point-to-point
D.permanent virtual circuits
Correct Answers: A

10: BGP is used as the CE-PE routing protocol in an MPLS VPN. The customer routes are successfully propagated from the CE router to the ingress PE router, but they are not showing up on the egress PE router. What is the most likely cause of the problem?
A.There is a BGP-to-MPBGP redistribution error on the ingress PE router.
B.There is a MPBGP-to-BGP redistribution error on the egress PE router.
C.One of the P routers is performing route summarization, breaking the path between the ingress and the egress PE routers into two LSPs.
D.RTs attached to the CE routes exported by the ingress router are not matched by at least one of the import RTs on the egress PE router.
E.A route reflector is used to propagate the routes from the ingress PE router to the egress PE router, thus breaking the LSP.
Correct Answers: D


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