642-611 dernières questions d'examen certification Cisco et réponses publiés

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Code d'Examen: 642-611
Nom d'Examen: Cisco (CCIP Implementing Cisco MPLS Exam (MPLS))
Questions et réponses: 509 Q&As

642-611 Démo gratuit à télécharger: http://www.pass4test.fr/642-611.html

NO.1 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:B D E

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.2 Refer to the exhibit. How many different VRFs are required to support the given connectivity
requirements? Sites CE1A and CE1B require connectivity to each other. Sites CE2A and CE2B
require connectivity to each other. Site CE1C requires connectivity to sites CE1A, CE1B, CE3A,
and CE3B. Site CE2C requires connectivity to sites CE2A, CE2B, CE3A, and CE3B. Sites CE3A and
CE3B require connectivity to each other and to CE1C and CE2C.
A.3 VRFs
B.4 VRFs
C.5 VRFs
D.6 VRFs
E.8 VRFs
Correct:C

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.3 Refer to the exhibit. Based on the show outputs, which condition could be preventing the P1
router from establishing TDP adjacency with its neighbor over the s0/0.211 and s0/0.212
subinterfaces?
A.The s0/0.211 and s0/0.212 subinterfaces line protocol are in the down state.
B.The P1 router cannot establish a TCP session with its neighbors.
C.The P1 router is missing the mpls label protocol LDP command.
D.The show mpls tdp neighbor command needs to be used to view the TDP neighbor status.
Correct:B

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.4 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
F.none
Correct:B

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.5 Refer to the exhibit. A diagram of a router connected to an MPLS-enabled ATM switch via an
LC-ATM MPLS interface, and a partial configuration for the MPLS-enabled ATM switch and router
are shown. Which statement describes what is incorrect about the configuration shown?
A.CEF has not been enabled on the router.
B.The VPI range of 2-3 is invalid.
C.The control VPI/VCI has not been set to 0/32 on the router.
D.VC-merge has not been enabled on the ATM switch interface.
E.The router has not been configured to specifically use LDP.
Correct:A

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.6 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:D

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.7 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:C

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.8 Lab.
Correct:

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.9 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:D

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.10 In the diagram, the Internet is accessed through a dedicated Internet VPN implementation.
Which routing table will PE-IG use to forward packets from the Internet to Site-2?
A.Global routing table
B.VPNv4 routing table
C.VRF A routing table
D.VRF Internet routing table
Correct:D

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.11 Look at the picture.
Correct:
Green choice1---->Yellow Choice1
Green choice5---->Yellow Choice2
Green choice9---->Yellow Choice3

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.12 Refer to the exhibit. A diagram of a router connected to an MPLS-enabled ATM switch via an
LC-ATM MPLS interface, and the partial configuration for the MPLS-enabled ATM switch and
router are shown. Which statement describes what is incorrect about the configuration?
A.The control VPI/VCI numbers do not match.
B.The ATM VPI range of 2-3 is invalid.
C.CEF has not been enabled on the router ATM 3/0.2 subinterface.
D.VC-merge has not been enabled on the switch ATM 0/1/2 interface.
E.The router has not been configured to specifically use LDP.
Correct:A

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.13 Look at the picture.
Correct:
Green choice1---->Yellow Choice1
Green choice6---->Yellow Choice2
Green choice2---->Yellow Choice3
Green choice5---->Yellow Choice4
Green choice3---->Yellow Choice5
Green choice4---->Yellow Choice6

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.14 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:B

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.15 Which kind of link does a Layer 3 overlay VPN use?
A.emulated point-to-point
B.dedicated point-to-point
C.point-to-multipoint
D.permanent virtual circuits
Correct:A

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.16 In the diagram, Internet access is through a dedicated subinterface implementation. Which of
its routing tables will PE-2 use to forward packets from Site-2 to Site-1?
A.the global routing table
B.the VPNv4 routing table
C.the VRF A routing table
D.the VRF A FIB
E.the PE-IG routing table
Correct:C

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.17 What are three characteristics of overlay VPNs? (Choose three.)
A.Service provider infrastructure appears as point-to-point links to the customer routers.
B.Routing protocols run directly between the customer routers.
C.Implementing optimum routing between customer sites requires a partial mesh of virtual circuits.
D.Service provider PE routers use route filtering to isolate between different customers.
E.Service provider does not participate in customer routing.
Correct:A B E

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.18 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:B

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.19 What best describes the following configuration example of allowas-in? router bgp 100
address-family ipv4 vrf CustomerAneighbor 195.12.4.5 remote-as 123 neighbor 195.12.4.5
activateneighbor 195.12.4.5 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:D

Cisco   642-611   642-611   certification 642-611   certification 642-611

NO.20 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:C

Cisco   642-611   642-611   certification 642-611   certification 642-611

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Code d'Examen: 642-611
Nom d'Examen: Cisco (CCIP Implementing Cisco MPLS Exam (MPLS))
Questions et réponses: 509 Q&As

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NO.1 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:D

Cisco examen   642-611 examen   642-611 examen

NO.2 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:C

Cisco examen   642-611 examen   642-611 examen

NO.3 Lab.
Correct:

Cisco examen   642-611 examen   642-611 examen

NO.4 Which kind of link does a Layer 3 overlay VPN use?
A.emulated point-to-point
B.dedicated point-to-point
C.point-to-multipoint
D.permanent virtual circuits
Correct:A

Cisco examen   642-611 examen   642-611 examen

NO.5 Refer to the exhibit. A diagram of a router connected to an MPLS-enabled ATM switch via an
LC-ATM MPLS interface, and the partial configuration for the MPLS-enabled ATM switch and
router are shown. Which statement describes what is incorrect about the configuration?
A.The control VPI/VCI numbers do not match.
B.The ATM VPI range of 2-3 is invalid.
C.CEF has not been enabled on the router ATM 3/0.2 subinterface.
D.VC-merge has not been enabled on the switch ATM 0/1/2 interface.
E.The router has not been configured to specifically use LDP.
Correct:A

Cisco examen   642-611 examen   642-611 examen

NO.6 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:B

Cisco examen   642-611 examen   642-611 examen

NO.7 Refer to the exhibit. A diagram of a router connected to an MPLS-enabled ATM switch via an
LC-ATM MPLS interface, and a partial configuration for the MPLS-enabled ATM switch and router
are shown. Which statement describes what is incorrect about the configuration shown?
A.CEF has not been enabled on the router.
B.The VPI range of 2-3 is invalid.
C.The control VPI/VCI has not been set to 0/32 on the router.
D.VC-merge has not been enabled on the ATM switch interface.
E.The router has not been configured to specifically use LDP.
Correct:A

Cisco examen   642-611 examen   642-611 examen

NO.8 What best describes the following configuration example of allowas-in? router bgp 100
address-family ipv4 vrf CustomerAneighbor 195.12.4.5 remote-as 123 neighbor 195.12.4.5
activateneighbor 195.12.4.5 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:D

Cisco examen   642-611 examen   642-611 examen

NO.9 Look at the picture.
Correct:
Green choice1---->Yellow Choice1
Green choice6---->Yellow Choice2
Green choice2---->Yellow Choice3
Green choice5---->Yellow Choice4
Green choice3---->Yellow Choice5
Green choice4---->Yellow Choice6

Cisco examen   642-611 examen   642-611 examen

NO.10 Refer to the exhibit. How many different VRFs are required to support the given connectivity
requirements? Sites CE1A and CE1B require connectivity to each other. Sites CE2A and CE2B
require connectivity to each other. Site CE1C requires connectivity to sites CE1A, CE1B, CE3A,
and CE3B. Site CE2C requires connectivity to sites CE2A, CE2B, CE3A, and CE3B. Sites CE3A and
CE3B require connectivity to each other and to CE1C and CE2C.
A.3 VRFs
B.4 VRFs
C.5 VRFs
D.6 VRFs
E.8 VRFs
Correct:C

Cisco examen   642-611 examen   642-611 examen

NO.11 Look at the picture.
Correct:
Green choice1---->Yellow Choice1
Green choice5---->Yellow Choice2
Green choice9---->Yellow Choice3

Cisco examen   642-611 examen   642-611 examen

NO.12 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:B

Cisco examen   642-611 examen   642-611 examen

NO.13 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:C

Cisco examen   642-611 examen   642-611 examen

NO.14 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:D

Cisco examen   642-611 examen   642-611 examen

NO.15 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:B D E

Cisco examen   642-611 examen   642-611 examen

NO.16 Refer to the exhibit. Based on the show outputs, which condition could be preventing the P1
router from establishing TDP adjacency with its neighbor over the s0/0.211 and s0/0.212
subinterfaces?
A.The s0/0.211 and s0/0.212 subinterfaces line protocol are in the down state.
B.The P1 router cannot establish a TCP session with its neighbors.
C.The P1 router is missing the mpls label protocol LDP command.
D.The show mpls tdp neighbor command needs to be used to view the TDP neighbor status.
Correct:B

Cisco examen   642-611 examen   642-611 examen

NO.17 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
F.none
Correct:B

Cisco examen   642-611 examen   642-611 examen

NO.18 In the diagram, Internet access is through a dedicated subinterface implementation. Which of
its routing tables will PE-2 use to forward packets from Site-2 to Site-1?
A.the global routing table
B.the VPNv4 routing table
C.the VRF A routing table
D.the VRF A FIB
E.the PE-IG routing table
Correct:C

Cisco examen   642-611 examen   642-611 examen

NO.19 What are three characteristics of overlay VPNs? (Choose three.)
A.Service provider infrastructure appears as point-to-point links to the customer routers.
B.Routing protocols run directly between the customer routers.
C.Implementing optimum routing between customer sites requires a partial mesh of virtual circuits.
D.Service provider PE routers use route filtering to isolate between different customers.
E.Service provider does not participate in customer routing.
Correct:A B E

Cisco examen   642-611 examen   642-611 examen

NO.20 In the diagram, the Internet is accessed through a dedicated Internet VPN implementation.
Which routing table will PE-IG use to forward packets from the Internet to Site-2?
A.Global routing table
B.VPNv4 routing table
C.VRF A routing table
D.VRF Internet routing table
Correct:D

Cisco examen   642-611 examen   642-611 examen

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Code d'Examen: 642-611

Nom d'Examen: Cisco (CCIP Implementing Cisco MPLS Exam (MPLS))

Questions et réponses: 509 Q&As

Code d'Examen: 642-642

Nom d'Examen: Cisco (Quality of Service (QoS))

Questions et réponses: 87 Q&As

Code d'Examen: 350-050

Nom d'Examen: Cisco (CCIE Wireless Exam (V2.0))

Questions et réponses: 315 Q&As

Code d'Examen: 642-415

Nom d'Examen: Cisco (Unified Communications Architecture and Design)

Questions et réponses: 61 Q&As

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NO.1 Based on the following 2950 switch configurations, which statement is correct?
no wrr-queue cos-map
wrr-queue bandwidth 20 10 70 1
wrr-queue cos-map 4 5
wrr-queue cos-map 1 0 1 2 3
wrr-queue cos-map 3 6 7
A. Queue 1 is setup as the expedite queue.
B. Queue 2 is setup as the expedite queue.
C. Queue 3 is setup as the expedite queue.
D. Queue 4 is setup as the expedite queue.
E. No queue is setup as the expedite queue.
Answer: E

Cisco   642-642   certification 642-642   certification 642-642   642-642 examen

NO.2 Which QoS mechanism calculates the mean queue depth to determine its operation?
A. WRED
B. LLQ/CBWFQ
C. WFQ
D. class-based shaping
E. class-based policing
Answer: A

Cisco   642-642 examen   642-642   certification 642-642

NO.3 Answer:

NO.4 Switch port fa0/2 has been configured to connect an IP phone with an attached PC. Given the set of
commands shown below, where does the trust boundary lie?
interface fa0/2
mls qos trust cos
mls qos trust device cisco-phone
switchport voice vlan 112
A. between the IP phone and the switch
B. between the IP phone and the PC
C. between the access layer switch and the distribution layer switch
D. between the PC port and the LAN port on the IP phone
Answer: A

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NO.5 Answer:

NO.6 Which two commands are typically applied to the voice traffic class within a policy-map? (Choose two.)
A. shape peak {bps}
B. priority {kbps}
C. bandwidth {kbps}
D. compress header ip rtp
E. random-detect ecn
F. random-detect dscp-based
Answer: BD

Cisco   642-642 examen   642-642   certification 642-642

NO.7 In which two locations is the qos pre-classify command applied to support QoS preclassification over an
IPSec/GRE tunnel? (Choose two.)
A. the tunnel interface
B. the physical interface
C. the crypto map
D. the policy-map
E. the class-map
Answer: AC

Cisco   642-642   642-642   642-642

NO.8 In a managed CE scenario, the customer's network is supporting VoIP and bulk file transfers.
According to the best practices, which QoS mechanisms should be applied on the WAN edge CE-PE
56-kbps Frame Relay link on the CE outbound direction?
A. WRR, FRTS, FRF.12, and CB-RTP header compression
B. WRR, CB-WRED, CB-Marking, FRF.12, and CB-RTP header compression
C. CBWFQ, CB-WRED, CB-Marking, CB-Policing, and FRTS
D. CBWFQ, FRTS, FRF.12, and CB-RTP header compression
E. LLQ, CB-WRED, CB-Marking, FRTS, FRF.12, and CB-RTP header compression
F. LLQ, CB-WRED, CB-Policing, and CB-TCP and CB-RTP header compressions
Answer: E

Cisco examen   642-642 examen   642-642   642-642   certification 642-642

NO.9 LAB
A. Please click console
Answer:
2950.SWITCH>en
2950-SWITCH#config terminal
2950-SWITCH(config)#int fa0/1
2950-SWITCH(config-if)#mls qos trust dscp
2950-SWITCH(config-if)#exit
2950-SWITCH(config)#int fa0/11
2950-SWITCH(config-if)#mls qos trust cos
2950-SWITCH(config-if)#exit
2950-SWITCH(config)#int fa0/10
2950-SWITCH(config-if)#mls qos trust cos
2950-SWITCH(config-if)#mls qos trust device cisco-phone
2950-SWITCH(config-if)#exit
2950-SWITCH(config)#exit
2950-SWITCH#copy run start

NO.10 What is the purpose of using multiactions traffic policing?
A. so that exceed traffic can be shaped and violate traffic can be policed
B. so that conform, exceed, and violate traffic can be marked with different CLPs
C. so that conform traffic from different flows can be marked with different DSCPs
D. so that class-based policing can mark at Layer 2 and Layer 3 at the same time
E. so that traffic can be policed using two separate rates
Answer: D

Cisco   642-642   642-642   642-642

NO.11 The following commands have been configured under the fa0/1 interface on the 2950 switch:
wrr-queue bandwidth 20 1 80 0
mls qos trust cos
mls qos trust device cisco-phone
Voice traffic from the IP phone that is directly connected to the fa0/1 interface is experiencing excessive
delays.
What could be the cause of this problem?
A. The wrr-queue bandwidth weightings are not correct.
B. The default wrr-queue cos-map is being used.
C. The default cos-to-dscp map is being used.
D. The default dscp-to-cos map is being used.
E. The trust boundary configuration is not correct.
Answer: B

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NO.12 In an unmanaged CE router implementation, how does the service provider enforce the SLA?
A. by using class-based policing on the CE to PE link to limit the customer's input rate
B. by marking on the CE to PE link and using CBWFQ and CB-WRED on the PE to P link
C. by marking on the CE to PE link and using class-based policing on the PE to P link
D. by using class-based random discard on the CE to PE link to limit the customer's input rate
Answer: A

certification Cisco   642-642   642-642   642-642   certification 642-642

NO.13 What is the purpose of the qos pre-classify command?
A. to enable the IOS to copy the ToS field from the original IP header to the outer tunnel IP header
B. to enable the IOS to copy the ToS field from the outer tunnel IP header back into the original IP header
C. to enable the IOS to classify the packet based on the original IP header instead of the tunnel IP header
D. to enable the IOS to classify the packet based on the outer tunnel IP header instead of the original IP
header
E. to enable class-based marking on tunnel interface
F. to enable class-based marking on IPSec crypto maps
Answer: C

Cisco   642-642   642-642 examen   642-642 examen   642-642 examen

NO.14 Refer to the exhibit.
Which three statements are true about the configuration.? (Choose three.)
class-map class-1
match ip rtp 2024 1000
class-map class 2
match dscp 5 6 7
policy-map access-group-1-traffic
class class-1
shape peak 16000
class class-2
police 8000 1000
conform-action set-dscp-transmit 1
exceed-action set-dscp-transmit 0
violate-action drop
class class-default
fair-queue 16
queue-limit 20
interface fastethernet 0/0
service-policy output access-group1-traffic
A. Traffic that is subject to shaping can burst up to 32,000 bps.
B. IP traffic (DSCPs 5, 6, and 7) that is sent on fastethernet 0/0 will be traffic policed.
C. RTP traffic (ports 2024 and 1000) that is sent on fastethernet 0/0 will be traffic shaped.
D. Traffic that is subject to policing will have the DCSP set to 0 if the rate exceeds 1000 bps.
E. IP traffic (DSCPs 1, 2, 3, and 4) that is sent on fastethernet 0/0 are considered to have a violate status
and are dropped.
F. IP traffic (DSCP 0) that is sent on fastethernet 0/0 will be subject to fair queuing.
Answer: ABF

certification Cisco   642-642 examen   642-642

NO.15 What does the following command accomplish?
router(config-pmap-c)# shape fecn-adapt
A. enables the router to lower the shaping rate when BECN bits are received
B. enables the router to lower the shaping rate when FECN bits are received
C. enables the router to respond to FECN bits by creating test frames in the opposite direction with the
BECN bit set
D. enables the router to respond to BECN bits by creating test frames in the opposite direction with the
FECN bit set
E. enables the router to increase the shaping rate when BECN bits are received
F. enables the router to increase the shaping rate when FECN bits are received
Answer: C

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L'avènement de la certification Cisco pratique d'examen 642-611 questions et réponses

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Code d'Examen: 642-611

Nom d'Examen: Cisco (CCIP Implementing Cisco MPLS Exam (MPLS))

Questions et réponses: 509 Q&As

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NO.1 Refer to the exhibit. A diagram of a router connected to an MPLS-enabled ATM switch via an
LC-ATM MPLS interface, and a partial configuration for the MPLS-enabled ATM switch and router
are shown. Which statement describes what is incorrect about the configuration shown?
A.CEF has not been enabled on the router.
B.The VPI range of 2-3 is invalid.
C.The control VPI/VCI has not been set to 0/32 on the router.
D.VC-merge has not been enabled on the ATM switch interface.
E.The router has not been configured to specifically use LDP.
Correct:A

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.2 What are three characteristics of overlay VPNs? (Choose three.)
A.Service provider infrastructure appears as point-to-point links to the customer routers.
B.Routing protocols run directly between the customer routers.
C.Implementing optimum routing between customer sites requires a partial mesh of virtual circuits.
D.Service provider PE routers use route filtering to isolate between different customers.
E.Service provider does not participate in customer routing.
Correct:A B E

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.3 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
F.none
Correct:B

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.4 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:D

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.5 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:B D E

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.6 Look at the picture.
Correct:
Green choice1---->Yellow Choice1
Green choice6---->Yellow Choice2
Green choice2---->Yellow Choice3
Green choice5---->Yellow Choice4
Green choice3---->Yellow Choice5
Green choice4---->Yellow Choice6

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.7 Refer to the exhibit. A diagram of a router connected to an MPLS-enabled ATM switch via an
LC-ATM MPLS interface, and the partial configuration for the MPLS-enabled ATM switch and
router are shown. Which statement describes what is incorrect about the configuration?
A.The control VPI/VCI numbers do not match.
B.The ATM VPI range of 2-3 is invalid.
C.CEF has not been enabled on the router ATM 3/0.2 subinterface.
D.VC-merge has not been enabled on the switch ATM 0/1/2 interface.
E.The router has not been configured to specifically use LDP.
Correct:A

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.8 Look at the picture.
Correct:
Green choice1---->Yellow Choice1
Green choice5---->Yellow Choice2
Green choice9---->Yellow Choice3

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.9 In the diagram, the Internet is accessed through a dedicated Internet VPN implementation.
Which routing table will PE-IG use to forward packets from the Internet to Site-2?
A.Global routing table
B.VPNv4 routing table
C.VRF A routing table
D.VRF Internet routing table
Correct:D

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.10 Lab.
Correct:

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.11 Refer to the exhibit. Based on the show outputs, which condition could be preventing the P1
router from establishing TDP adjacency with its neighbor over the s0/0.211 and s0/0.212
subinterfaces?
A.The s0/0.211 and s0/0.212 subinterfaces line protocol are in the down state.
B.The P1 router cannot establish a TCP session with its neighbors.
C.The P1 router is missing the mpls label protocol LDP command.
D.The show mpls tdp neighbor command needs to be used to view the TDP neighbor status.
Correct:B

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.12 In the diagram, Internet access is through a dedicated subinterface implementation. Which of
its routing tables will PE-2 use to forward packets from Site-2 to Site-1?
A.the global routing table
B.the VPNv4 routing table
C.the VRF A routing table
D.the VRF A FIB
E.the PE-IG routing table
Correct:C

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.13 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:B

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.14 Refer to the exhibit. How many different VRFs are required to support the given connectivity
requirements? Sites CE1A and CE1B require connectivity to each other. Sites CE2A and CE2B
require connectivity to each other. Site CE1C requires connectivity to sites CE1A, CE1B, CE3A,
and CE3B. Site CE2C requires connectivity to sites CE2A, CE2B, CE3A, and CE3B. Sites CE3A and
CE3B require connectivity to each other and to CE1C and CE2C.
A.3 VRFs
B.4 VRFs
C.5 VRFs
D.6 VRFs
E.8 VRFs
Correct:C

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.15 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:D

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.16 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:C

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.17 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:C

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.18 What best describes the following configuration example of allowas-in? router bgp 100
address-family ipv4 vrf CustomerAneighbor 195.12.4.5 remote-as 123 neighbor 195.12.4.5
activateneighbor 195.12.4.5 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:D

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.19 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:B

Cisco examen   certification 642-611   642-611   642-611   642-611

NO.20 Which kind of link does a Layer 3 overlay VPN use?
A.emulated point-to-point
B.dedicated point-to-point
C.point-to-multipoint
D.permanent virtual circuits
Correct:A

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