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Implementing Cisco MPLS Exam

Exam Number: 642-611
Associated Certifications: CCIP
Duration: 90 minutes (55-65 questions)
Available Languages: English
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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
The MPLS exam is a qualifying exam for the CCIP certification (Cisco Certified Internetwork Professional). 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.

Exam Topics
The following information provides general guidelines for the content likely to be included on the exam. However, other related topics may also appear on any specific delivery of the exam.

MPLS Fundamentals
Explain basic core MPLS technology and concepts
Explain the function of MPLS Labels and Label Stack
Identify MPLS Applications

MPLS Operation
Describe the characteristics and behaviors of Label Distribution in Frame-mode MPLS
Explain Convergence in Frame-mode MPLS
Describe the characteristics and behaviors of Label Distribution over LC-ATM Interfaces and VC Merge
Describe the features of MPLS Label Allocation, Distribution, and Retention Modes
Explain the process of LDP Neighbor Discovery

Frame-Mode/Cell-Mode MPLS Implementation, Configuration and Troubleshooting
Identify the functions of CEF Switching
Explain and configure Frame-mode MPLS on Cisco IOS platforms
Monitor MPLS on Cisco IOS platforms - Frame-mode interfaces
Troubleshoot Frame-Mode MPLS configurations on Cisco IOS Platforms
Explain and configure Label-Controlled ATM MPLS
Explain and configure LC-ATM MPLS over ATM Virtual Path
Monitor LC-ATM MPLS on Cisco IOS platforms

MPLS Virtual Private Networks Technology
Describe the characteristics and functions of Virtual Private Networks
Describe Overlay and Peer-to-Peer VPNs
Explain Major VPN Categorization
Describe MPLS VPN Architecture
Describe the MPLS VPN Routing Model
Explain the process of MPLS VPN Packet Forwarding

MPLS VPN Implementation, Configuration and Troubleshooting
Explain MPLS VPN Mechanisms supported on Cisco Platforms
Configure VRF tables
Configure MP-BGP Session between PE routers
Configure Small Scale Routing Protocols
Monitor MPLS VPN Operation
Configure OSPF as the Routing Protocol
Configure BGP as the Routing Protocol
Troubleshoot basic MPLS VPN configuration errors

Complex MPLS VPNs
Describe the advanced VRF Import/Export Features
Explain the characteristics of Overlapping VPNs
Explain the features of Central Services VPNs
Describe Managed CE Router Service

Internet Access from a MPLS VPN
Explain VPN Internet Access Topologies
Describe VPN Internet Access Implementation Methods
Describe the methods to Separate Internet Access from VPN Service
Internet Access Backbone as a Separate VPN

QUESTION 1:

Which statement is true about the hardware requirements of MPLS?

A. Because you do not need to run a routing protocol on P-routers, they require less memory than routers supporting classic IP routing.
B. Because of the additional processing and memory requirements needed to build the
LFIB, MPLS is only available on high end routers.
C. MPLS is available on low end routers, built their use is limited because of the additional processing and memory requirements needed to build the LFIB.
D. Because P-routers do not need to carry routes outside the MPLD domain, they require less memory than routers that support the same application using classic IP routing.

Answer: C

QUESTION 2:

If aggregation (summarization) were to be used on a network with ATM LSRs. What would result?

A. LSPs would be broken in two.
B. There would be extra LFIB entries.
C. The size of the LFIB table would increase. D. There would be extra LIB entries

Answer: A

QUESTION 3:

What is true of MPLS TE?

A. Only the ingress LSR must see the entire topology of the network.
B. Every LSR needs additional information about links in the network, available resources, and constraints.
C. Every core router must be able to create an LSP tunnel on demand.
D. Both RSVP and CR-LDP are used in conjunction to establish traffic engineering (TE)
tunnels and to propagate the labels. Answer: B
QUESTION 4:

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.- Answer: B
Explanation:
Drawbacks of Traditional IP Forwarding IP over ATM
1) Layer 2 devices have no knowledge of Layer 3 routing information - virtual circuits must be manually established.
2) Layer 2 topology may be different from Layer 3 topology, resulting in suboprtimal paths and link use.
3) Even if the two topologies overlap, the hub-and-spoke topology is usually used because of easier management.

QUESTION 5:

What is true of MPLS TE?

A. Only the ingress LSR must see the entire topology of the network.
B. Every LSR needs additional information about links in the network, available resources, and constraints.
C. Every core router must be able to create an LSP tunnel on demand.
D. Both RSVP and CR-LDP are used in conjunction to establish traffic engineering (TE)
tunnels and to propagate the labels. Answer: B
QUESTION 6:

In order for MPLS to be implemented on ATM switches, what requirements must the ATM switch meet? Select two.

A. become Layer 3 aware by running a routing protocol
B. use MPLS LDP or TDP to distribute and receive MPLS label information
C. use BGP to exchange MPLS VPN labels in the data plane
D. use RSVP to exchange MPLS traffic-engineering labels in the data plane
E. establish a full mesh of Layer 2 ATM virtual circuits between all the ATM switches in the MPLS domain
F. use cell-mode MPLS and insert MPLS label in the ATM AAL5 header

Answer: A, B

QUESTION 7:

When running basic MPLS in conjunction with VPNs, how many labels does each packet contain?

A. Each packet contains one label that identifies the VPN.
B. Each packet contains at least two labels. One label identifies the path to the egress router and one that identifies the VPN.
C. Each packet contains at least three labels. One label identifies the ingress router, one identifies the egress router and one identifies the path that will be taken.
D. Each packet contains at least three labels. One label identifies the ingress router, one label identifies the path to the egress router, and one identifies the VPN.

Answer: B

QUESTION 8:

On ingress, a label is imposed to a packet. Which process is responsible for this function?

A. LDP process.
B. Control plane process
C. Penultimate hop process.
D. Forwarding plane process. Answer: B
QUESTION 9:

How could you check for potential MTU size issues on the path taken by a PE-to-PE LSP?

A. Because MPLS packets are label switched, MTU problems can only be detected by the user applications.
B. Use the ping vrf command with packet size set to the largest MTU along the path and
DF bit set from the local PE-router to ping the remote PE-router.
C. Use the ping vrf command with packet size set to the smallest MTU along the path and DF bit set from the local PE-router to ping the remote PE-router.
D. Because MPLS packets are label switched, packets are automatically fragmented and reassembled by the PE-routers.
Therefore, there are no potential MTU issues. Answer: A D
QUESTION 10:
QUESTION 1:

Which statement is true about the hardware requirements of MPLS?

A. Because you do not need to run a routing protocol on P-routers, they require less memory than routers supporting classic IP routing.
B. Because of the additional processing and memory requirements needed to build the
LFIB, MPLS is only available on high end routers.
C. MPLS is available on low end routers, built their use is limited because of the additional processing and memory requirements needed to build the LFIB.
D. Because P-routers do not need to carry routes outside the MPLD domain, they require less memory than routers that support the same application using classic IP routing.

Answer: C

QUESTION 2:

If aggregation (summarization) were to be used on a network with ATM LSRs. What would result?

A. LSPs would be broken in two.
B. There would be extra LFIB entries.
C. The size of the LFIB table would increase. D. There would be extra LIB entries

Answer: A

QUESTION 3:

What is true of MPLS TE?

A. Only the ingress LSR must see the entire topology of the network.
B. Every LSR needs additional information about links in the network, available resources, and constraints.
C. Every core router must be able to create an LSP tunnel on demand.
D. Both RSVP and CR-LDP are used in conjunction to establish traffic engineering (TE)
tunnels and to propagate the labels. Answer: B
QUESTION 4:

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.- Answer: B
Explanation:
Drawbacks of Traditional IP Forwarding IP over ATM
1) Layer 2 devices have no knowledge of Layer 3 routing information - virtual circuits must be manually established.
2) Layer 2 topology may be different from Layer 3 topology, resulting in suboprtimal paths and link use.
3) Even if the two topologies overlap, the hub-and-spoke topology is usually used because of easier management.

QUESTION 5:

What is true of MPLS TE?

A. Only the ingress LSR must see the entire topology of the network.
B. Every LSR needs additional information about links in the network, available resources, and constraints.
C. Every core router must be able to create an LSP tunnel on demand.
D. Both RSVP and CR-LDP are used in conjunction to establish traffic engineering (TE)
tunnels and to propagate the labels. Answer: B
QUESTION 6:

In order for MPLS to be implemented on ATM switches, what requirements must the ATM switch meet? Select two.

A. become Layer 3 aware by running a routing protocol
B. use MPLS LDP or TDP to distribute and receive MPLS label information
C. use BGP to exchange MPLS VPN labels in the data plane
D. use RSVP to exchange MPLS traffic-engineering labels in the data plane
E. establish a full mesh of Layer 2 ATM virtual circuits between all the ATM switches in the MPLS domain
F. use cell-mode MPLS and insert MPLS label in the ATM AAL5 header

Answer: A, B

QUESTION 7:

When running basic MPLS in conjunction with VPNs, how many labels does each packet contain?

A. Each packet contains one label that identifies the VPN.
B. Each packet contains at least two labels. One label identifies the path to the egress router and one that identifies the VPN.
C. Each packet contains at least three labels. One label identifies the ingress router, one identifies the egress router and one identifies the path that will be taken.
D. Each packet contains at least three labels. One label identifies the ingress router, one label identifies the path to the egress router, and one identifies the VPN.

Answer: B

QUESTION 8:

On ingress, a label is imposed to a packet. Which process is responsible for this function?

A. LDP process.
B. Control plane process
C. Penultimate hop process.
D. Forwarding plane process. Answer: B
QUESTION 9:

How could you check for potential MTU size issues on the path taken by a PE-to-PE LSP?

A. Because MPLS packets are label switched, MTU problems can only be detected by the user applications.
B. Use the ping vrf command with packet size set to the largest MTU along the path and
DF bit set from the local PE-router to ping the remote PE-router.
C. Use the ping vrf command with packet size set to the smallest MTU along the path and DF bit set from the local PE-router to ping the remote PE-router.
D. Because MPLS packets are label switched, packets are automatically fragmented and reassembled by the PE-routers.
Therefore, there are no potential MTU issues. Answer: A D
QUESTION 10:
QUESTION 1:

Which statement is true about the hardware requirements of MPLS?

A. Because you do not need to run a routing protocol on P-routers, they require less memory than routers supporting classic IP routing.
B. Because of the additional processing and memory requirements needed to build the
LFIB, MPLS is only available on high end routers.
C. MPLS is available on low end routers, built their use is limited because of the additional processing and memory requirements needed to build the LFIB.
D. Because P-routers do not need to carry routes outside the MPLD domain, they require less memory than routers that support the same application using classic IP routing.

Answer: C

QUESTION 2:

If aggregation (summarization) were to be used on a network with ATM LSRs. What would result?

A. LSPs would be broken in two.
B. There would be extra LFIB entries.
C. The size of the LFIB table would increase. D. There would be extra LIB entries

Answer: A

QUESTION 3:

What is true of MPLS TE?

A. Only the ingress LSR must see the entire topology of the network.
B. Every LSR needs additional information about links in the network, available resources, and constraints.
C. Every core router must be able to create an LSP tunnel on demand.
D. Both RSVP and CR-LDP are used in conjunction to establish traffic engineering (TE)
tunnels and to propagate the labels. Answer: B
QUESTION 4:

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.- Answer: B
Explanation:
Drawbacks of Traditional IP Forwarding IP over ATM
1) Layer 2 devices have no knowledge of Layer 3 routing information - virtual circuits must be manually established.
2) Layer 2 topology may be different from Layer 3 topology, resulting in suboprtimal paths and link use.
3) Even if the two topologies overlap, the hub-and-spoke topology is usually used because of easier management.

QUESTION 5:

What is true of MPLS TE?

A. Only the ingress LSR must see the entire topology of the network.
B. Every LSR needs additional information about links in the network, available resources, and constraints.
C. Every core router must be able to create an LSP tunnel on demand.
D. Both RSVP and CR-LDP are used in conjunction to establish traffic engineering (TE)
tunnels and to propagate the labels. Answer: B
QUESTION 6:

In order for MPLS to be implemented on ATM switches, what requirements must the ATM switch meet? Select two.

A. become Layer 3 aware by running a routing protocol
B. use MPLS LDP or TDP to distribute and receive MPLS label information
C. use BGP to exchange MPLS VPN labels in the data plane
D. use RSVP to exchange MPLS traffic-engineering labels in the data plane
E. establish a full mesh of Layer 2 ATM virtual circuits between all the ATM switches in the MPLS domain
F. use cell-mode MPLS and insert MPLS label in the ATM AAL5 header

Answer: A, B

QUESTION 7:

When running basic MPLS in conjunction with VPNs, how many labels does each packet contain?

A. Each packet contains one label that identifies the VPN.
B. Each packet contains at least two labels. One label identifies the path to the egress router and one that identifies the VPN.
C. Each packet contains at least three labels. One label identifies the ingress router, one identifies the egress router and one identifies the path that will be taken.
D. Each packet contains at least three labels. One label identifies the ingress router, one label identifies the path to the egress router, and one identifies the VPN.

Answer: B

QUESTION 8:

On ingress, a label is imposed to a packet. Which process is responsible for this function?

A. LDP process.
B. Control plane process
C. Penultimate hop process.
D. Forwarding plane process. Answer: B
QUESTION 9:

How could you check for potential MTU size issues on the path taken by a PE-to-PE LSP?

A. Because MPLS packets are label switched, MTU problems can only be detected by the user applications.
B. Use the ping vrf command with packet size set to the largest MTU along the path and
DF bit set from the local PE-router to ping the remote PE-router.
C. Use the ping vrf command with packet size set to the smallest MTU along the path and DF bit set from the local PE-router to ping the remote PE-router.
D. Because MPLS packets are label switched, packets are automatically fragmented and reassembled by the PE-routers.
Therefore, there are no potential MTU issues. Answer: A D
QUESTION 10:
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642-611 Q & A with Explanations
642-611 Audio Exam
642-611 Study Guide
642-611 Preparation Lab

Exam Number/Code: 642-611
Exam Name: CCIP Implementing Cisco MPLS Exam (MPLS)
VUE Code: 642-611
Questions Type: Single choice,
Question Numbers of Real-exam: 55-65 questions

“CCIP Implementing Cisco MPLS Exam (MPLS)”, also known as 642-611 exam, is a Cisco certification.
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