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

Exam Number/Code: 642-611
Exam Name:CCIP Implementing Cisco MPLS Exam (MPLS)

“CCIP Implementing Cisco MPLS Exam (MPLS)”, also known as 642-611 exam, is a Cisco certification. With the complete collection of questions and answers, Passguides has assembled to take you through 102 Q&As to your 642-611 Exam preparation. In the 642-611 exam resources, you will cover every field and category in CCIP helping to ready you for your successful Cisco Certification.
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Exam DetailsThe 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.

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QUESTION 11:
Which two statements are true about the label stack used for MPLS VPNs? (Choose
two)
A. The first label in the label stack is the VPN label assigned by the egress PE router.
B. The first label in the label stack is the LDP label used to reach the egress PE router.
C. The first label in the label stack is the VPN label used to reach the egress PE router.
D. The second label in the label stack is the VPN label assigned by the egress PE router.
E. The second label in the label stack is the LDP label used to each the egress PE router.
F. The second label in the label stack is the VPN label assigned by the ingress PE router
and tells the ingress PE router how to forward the incoming VPN packet.
Answer: B, D
QUESTION 12:
What is true about how MPLS implementations support different applications?
A. The applications only differ in the control plane.
B. The forwarding plane is customized for each application.
C. MPLS VPNs require RSVP.
D. In general a FEC is assigned to a label.
Answer: A
QUESTION 13:
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MPLS supports which three applications? (Choose three)
A. VPN
B. CDN
C. QoS
D. Broadcast
E. Traffic engineering
Answer: A, C, E
Explanation:
MPLS is used in many different applications:
1) Unicast IP routing
2) Multicast IP routing
3) MPLS TE
4) QoS
5) MPLS VPNs
6) AToM
QUESTION 14:
What are two methods to achieve differentiated QoS in MPLS? (Choose two)
A. By creating a separate Label Switch Path for each class.
B. By using the experimental bits to identify the different classes.
C. By using the DiffServ Codepoints to identify the different classes.
D. By using the TOS bits in the Layer 3 header to identify the different classes.
Answer: B C
Explanation:
Two general approaches are used to mark MPLS traffic for QoS handling within
an MPLS network in the first method, the DiffServ “coloring” information is carried
in the experimental (EXP) field of the MPLS shim header. This field allows for
eight different QoS markings. Label Switched Paths (LSPs) using this approach
are called E-LSPs, signifying that QoS information is inferred from the EXP field.
Alternatively, IETF specifications allow for a second method of carrying the
DiffServ information. Here, the label associated with each MPLS packet carries
the portion of the DiffServ marking that specifies how a packet should be queued.
The dropping precedence portion of the DiffServ marking is carried either in the
EXP field, if an MPLS shim header is being used, or on fields available for this
purpose on underlying technologies (for example, CLP bit for ATM and DE bit for
Frame Relay). Switching paths within the MPLS network using this approach are
called L-LSPs, signifying that QoS information is inferred, in part, from the MPLS
label.
LSPs supporting DiffServ may be established with bandwidth reservation. That
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is, bandwidth requirements for a label switched path could be signaled at LSP
establishment time. Bandwidth reservation could be used to perform admission
control on the DiffServ resources that have been provisioned. Though admission
control can be performed on an LSP basis, the QoS design within the MPLS
network is DiffServ-based, taking advantage of the scalability benefits implicit in
that QoSarchitecture.
Reference:
http://www.cisco.com/en/US/tech/ CK4 36/ CK4 28/technologies_white_paper09186a00800a4455.shtml
QUESTION 15:
How does a core LSR operating in the default frame mode advertise labels?
A. The core LSR advertises a label for every destination in its FIB.
B. The core LSR only advertises labels for destinations inside the MPLS domain.
C. The core LSR only advertises labels for destinations outside the MPLS domain.
D. The core LSR does not advertise labels. Label advertisements is only done by the
PE-router.
Answer: A
Explanation:
Core LSRs receive this labeled packet and use label forwarding tables to exchange the
inbound label in the incoming packet with the outbound label corresponding to the same
FEC.
Reference: MPLS and VPN Architectures (Ciscopress) page 25
QUESTION 16:
In frame-relay MPLS, where is the label imposed?
A. Between Layer 1 and Layer 2 headers.
B. Between Layer 2 and Layer 3 headers.
C. In the VPI/VCU fields.
D. In the VPI field alone.
Answer: B
Explanation:
MPLS labels are assigned to packets based on groupings or forwarding equivalency
classes (FECs) at the ingress eLSR. A FEC is a group of packets from a source IP address
that are all going to the same destination. The MPLS label is imposed between Layer 2
and Layer 3 headers in a frame-based packet environment, or in the Layer 2 virtual path
identifier/virtual channel identifier (VPI/VCI) field in cell-based networks like ATM.
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QUESTION 17:
Network topology exhibit
Liberal label retention and unsolicited downstream distribution is being used in the
frame-mode MPLS network shown in the exhibit. The best to network X as defined
by the IGP for network is Certkiller 1- Certkiller 2- Certkiller 4- Certkiller 5.
What will Router Certkiller 3 and rout
A. Both routers will add it to their LIB.
B. Both routers will ignore it.
C. Router Certkiller 3 will add the label to its LIB. Router Certkiller 4 will ignore it.
D. Router Certkiller 4 will add the label to its LIB. Router Certkiller 3 will ignore it.
Answer: A
QUESTION 18:
What is true about the label in frame-mode MPLS?
A. 32 bit label with an 8 bit label field.
B. 32 bit label with a 20 bit label field.
C. 20 bit label with a 3 bit Bottom of Stack field.
D. 20 bit label with a 1 bit TTL field.
Answer: B
QUESTION 19:
Which two statements about TDP and LDP are true? (Choose two)
A. TDP and LDP populate the same LFIB.
B. TDP operates over UPD while LDP operates over TCP.
C. TDP and LDP both operate over TCP, but use different port numbers.
D. While TDP and LDP are functionally equivalent, they use a different label format.
Answer: A, C
Explanation:
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According to the “Implementing Cisco MPLS” Student Guide (Text
Part Number: 97-1153-01) Volume 1, version 1.0, page 2-51.
TDP vs. LDP:
- MPLS and Tag switching are equal on the data plane ( for me it means that they
populate the same FIB and LFIB)
- The only difference is on the control plane, where tag switching uses Cisco proprietary
TDP and MPLS uses standard LDP
- TDP and LDP are functionally equivalent but not compatible
- TDP use UDP and TCP port number 711
- LDP uses UDP and TCP port number 646
Not D: LDP and TDP use the same label format.
QUESTION 20:
Which command should you use to display the contents of LFIB?
A. show tag routes
B. show tag tdp lfib
C. show tag bindings
D. show tag forwarding-table
Answer: D
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