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QUESTION 355
Which of the following label operations can be performed by a P router that is not a penultimate router in the MPLS VPN path?
A. Pop
B. Purge
C. Push
D. Swap
Correct Answer: D Section: (none) Explanation
Explanation/Reference: QUESTION 356
If labels are being distributed in an MPLS network but no labels are being allocated for local routes, what could be the problem?
A. There is an error with the conditional label distribution configurat on.
B. CEF is disabled on the LSR.
C. There are no LDP neighborships established to the LSR.
D. CEF is not enabled on an input interface.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 357
If you use the configuration statement “mpls mtu 1512” how many labels in a label stack are being allowed for?
A. 3
B. 2
C. 4
D. 1
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 358
In an MPLS domain that carries BGP traffic it is best to use host routes without summarization for BGP next hop addresses. True or false?
A. False
B. True
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 359
How is the TTL field in the label header generated?
A. It is set to a number equal to the number of hops in the MPLS path plus 1.
B. It is copied from the TTL field in the IP header on ingress.
C. It is copied from the TTL field in the IP header on egress.
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QUESTION 286
What is true about TDP and LDP?
A. They can coexist in an MPLS network providing peers use the same type.
B. They are compatible between peers of differing type.
C. They are functionally equivalent but incompatible.
D. An MPLS network must use only one type throughout.
Correct Answer: AC Section: (none) Explanation
Explanation/Reference:
QUESTION 287
How many bits are there in the label field of an MPLS label?
A. 24
B. 30
C. 16
D. 20
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 288
In multicast IP routing what entity is assigned a unique FEC?
A. An IGP prefix in conjunction with a class of service.
B. An egress router.
C. An IGP prefix.
D. A destination multicast address.
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 289
When using a hub and spoke VPN topology and EBGP as the PE to CE protocol it is necessary to implement allowas-in on the PE router that connects to the customer hub site. True or false?
A. True
B. False Correct Answer: A
Section: (none) Explanation
Explanation/Reference:
QUESTION 290
How many interfaces can be associated to a VRF?
A. 1
B. 2
C. 0
D. Many
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 291
Which of the following correctly configures simple per-VRF OSPF?
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QUESTION 239
The LDP identifier is used to identify a router during LDP session establishment. What size is the LDP identifier?
A. 8 bytes
B. 6 bytes
C. 2 bytes
D. 4 bytes
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation:
From page 33 of reference “The TDP identifier is determined in the same way as the OSPF or BGP
identifier (unless controlled by the tag tdp router-id command) — the highest IP address of all loopback
interfaces is used. That means the identified is a 32-bit ip address which should be 32/8 = 4 bytes long.
Reference: MPLS and VPN Architectures (CCIP edition)
QUESTION 240
What is true about frame mode MPLS?
A. It uses Conservative label retention.
B. It uses per-platform label allocation.
C. It uses ordered label control.
D. It used per-interface label allocation.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 241
What is a possible use of make-before-break recovery using frame mode MPLS traffic engineering?
A. It overcomes issues of convergence during both link failure and recovery.
B. It overcomes issues of convergence during link recovery.
C. It overcomes issues of convergence during link failure.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 242
Which of the following modes of operation would be used for cell mode MPLS?
A. Unsolicited label distribution.
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QUESTION 207
In a central services topology, which routes do client VRFs contain?
A. Routes from the client site, but not from the server site.
B. Routes from the server site, but not from the client site.
C. Routes from both the client site and the server site.
D. Only EBGP routes from either the client site or the server site.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: When implementing central service VPN you put ALL servers into the new VRF. This removes the use for routes between client sites. And this is what is the issue here. Of cause every client site might use an IGP like rip, ospf, isis, eigrp or ibgp for internal routing between vlans, but the vrf for a given client site will only contain routes for the server site, and not from the (other) client site(S), which makes the correct answer B.
QUESTION 208
In a managed CE router VPN implementation, which three of the following are RT configuration tasks or tasks that would need to be completed? (Choose three)
A. Configure NMS import / export route target in NMS VRF.
B. Configure NMS import / export route target in customer VRF.
C. Import routes with NMS RT into customer VRF.
D. Export routes with NMS RT into customer VRF.
E. Export loopback addresses from customer VRF with RT NMS_Client.
F. Import loopback addresses from customer VRF with RT NMS_Client.
Correct Answer: ACE Section: (none) Explanation
Explanation/Reference:
Explanation: A not B: Reference: Implementing Cisco MPLS Student Guide Volume 2 Version 2.1 Page 6-42 Configuring Route Targets: 1) Configure per-customer import-export route target in all customer VRFs 2) Configure NMS import-export route target in NMS VRF 3) Import routes with NMS RT into customer VRF 4) Export loopback addresses from customer VRF with RT NMS_Client 5) Import routes with RT NMS_Client into NMS VRF
QUESTION 209
What is the difference in implementation between a managed CE services MPLS VPN and a central servicesMPLS VPN?
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QUESTION 86
Which four of the following questions need to be answered during the MPLS VPN troubleshooting process? (Choose four.)
A. Are the VPNv4 routes propagated to the other PE routers?
B. Are the CE routes received by the PE and inserted into the PE VRF?
C. Are the CE routes received by the PE router redistributed into the PE global BGP table?
D. Are the VPNv4 routes redistributed from MPBGP into the PE-CE routing protocol?
E. Are the VPNv4 routes inserted into the VRF on the other PE routers?
F. Are the PE routers enabled for propagating IPv4 routing updates between them?
Correct Answer: ABDE Section: (none) Explanation
Explanation/Reference:
QUESTION 87
Refer to the exhibit. Routers A and D are the edge LSRs. If the link between Routers B and C has failed, what best represents the state of the LFIB table on Router B after convergence?
A. Label 25, Action 75, Next Hop E
B. Label 47, Action pop, Next Hop E
C. Label 75, Action 25, Next Hop E
D. Label 47, Action pop, Next Hop C
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 88
Look at the picture.
A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
Answer: Check certifyme eEngine, Download from Member Center
QUESTION 89
The MPLS VPN provider is using a separate Internet VPN to provide Internet access to its MPLS VPN customers. Currently, all of its customers are not able to access the Internet. The partial provider’s CE-Internet router configuration is shown below. Based on the configuration, what could be the cause of the problem? ip route 0.0.0.0 0.0.0.0 10.1.1.1 ! router bgp 51001 network 0.0.0.0 neighbor 10.2.2.2 remote-as 51002 ! PE neighbor router neighbor 10.2.2.2 prefix-list test1 out neighbor
10.3.3.3 remote-as 51001 ! Another Internet router neighbor 10.3.3.3 prefix-list test2 out ! ip prefix-list test2 permit 0.0.0.0/0 ip prefix-list test1 permit 0.0.0.0/0 ge 1
A. The test2 prefix-list should be applied to the 10.2.2.2 neighbor and the test1 prefix-list should be applied to the 10.3.3.3 neighbor.
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QUESTION 157
How are routing protocol context implemented in OSPF?
A. Each routing context is implemented by redistributing into MBGP.
B. Each routing context is implemented by assigning it to an interface.
C. Each routing context is implemented as a separate routing process.
D. Each routing context is implemented as a separate isolated instance of the same routing protocol.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation:
According to the “Implementing Cisco MPLS” Student Guide (Text Part Number:
97-1154-01) Volume 2, version 1.0, page 8-6.
-Routing context=routing protocol run in one vrf
-Routing contexts were introduced in Cisco IOS software to support the need for separate isolated copies
of VPN routing protocols. They can be implemented as separate routing processes (OSPF), similar to
traditional Cisco IOS software implementation, or as separate isolated instances of the same routing
protocol (EBGP, RIPv2).
This is the same issue as the question 201.
QUESTION 158
The VPN named my_vpn is operating on interface s0/0 of a PE-router. The CE-PE routing protocol is
OSPF.
The MPLS backbone IPG is OSPF.
Which statement is true about the interaction between the customer’s OSPF routes and the backbone’s
OSPF routes?
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QUESTION 77
Which IOS show command can be used to examine the MPLS VPN label stack for a prefix?
A. show ip route vrf {vrf-name} {ip-prefix}
B. show ip cef {ip-prefix}
C. show ip cef vrf {vrf-name} {ip-prefix}
D. show ip vrf detail
E. show ip bgp vpnv4 all
F. show mpls interfaces
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 78
Using OSPF as the CE-PE routing protocol, when and which router will set the down bit?
A. The PE router will set the down bit when redistributing routes from MP-BGP into OSPF.
B. The PE router will set the down bit when redistributing routes from OSPF into MP-BGP.
C. The CE router will set the down bit when propagating the OSPF route to the PE router.
D. The PE router will set the down bit when propagating the OSPF route to the CE router.
E. The P router will set the down bit when propagating the route to another P router.
F. The PE router will set the down bit when propagating the route to another PE router over MP-BGP.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 79
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
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 80
Which three fields must be included in MPBGP updates between PE routers in an MPLS network? (Choose three.)
A. VPNv4 address
B. label used for VPN packet forwarding
C. AS path
D. Site of Origin
E. TE path designator
Correct Answer: ABC Section: (none) Explanation
Explanation/Reference:
QUESTION 81
A pair of MPLS routers, operating in the default frame-mode, are connected over two parallel links. Which of the following describes what will happen when they try to establish LDP sessions?
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QUESTION 135
Which VRF parameters must be specified for a VRF to become operational?
A. RD
B. Interface
C. Import RT.
D. Export RT.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 136
How are route targets used to build virtual routing tables in the PE-routers?
A. Route targets are prepended to each entry in the VRF to identify which VPN owns the route.
B. Route targets are prepended to the customer’s IP address to create unique address spacing for each VPN.
C. Every customer route exported from a VRF is tagged with appropriate export route targets. VPN routes received by a PE-router are matched against import route targets configured in a CRF.
D. Every customer route received from the CE is matched against import route targets. If there is match, the route is added to the VRF. Every route received from the neighbor PE-router is entered in the VRF. It is then matched against export route targets.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation: Route distinguisher is prepended to IP address to create VPN address, not Route target.
QUESTION 137
When should you disable redistribution of IPv4 routing updates between MP-BGP neighbors?
A. When the network only supports MPLS VPNs.
B. When the network is using OSPF or ISIS instead of I-BGP as the network IGP.
C. When you want to reduce the number of labels that the P-router needs to store.
D. When you want to reduce the number of routes that the P-routers must store in their global BGP routing table.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 138
With MPLS VPNs, which four elements will be included in an MP-BGP update exchange between the PE routers? (Choose two)
A. VPNv4 Address
B. Route tag
C. Label used for VPN packet forwarding
D. Mandatory BGP attributed like As-Path and Next-Hop
E. Route target
F. Implicit null label used for PHP operation
Correct Answer: ACDE Section: (none) Explanation
Explanation/Reference:
QUESTION 139
The VPN named my_vpn is operating on interface s0/0 a PE-router. The CE-PE routing protocol isRIP.
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QUESTION 45
Look at the picture.
A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
Answer: Check certifyme eEngine, Download from Member Center
QUESTION 46
Look at the picture.
This question is not scored, answer it or not will not effect your score. So we dont provide answers for it
A.
B.
C.
D.
Correct Answer:
Section: (none) Explanation
Explanation/Reference:
Answer: Check certifyme eEngine, Download from Member Center
QUESTION 47
When using MPLS unicast IP forwarding, what will happen if an LSR receives an incoming labeled packet but the LSR can’t find that incoming label in its LFIB?
A. The packet will be forwarded using the FIB.
B. The packet will be forwarded using the LIB.
C. The packet will be process switched by performing a route lookup in the routing table.
D. The packet will be forwarded using the LFIB with an imp-null outgoing label.
E. The packet will be dropped even if the IP destination exists in the FIB.
Correct Answer: E Section: (none) Explanation
Explanation/Reference:
QUESTION 48
A PE router is running EIGRP with its MPLS VPN customer. What is wrong with the following EIGRP configuration on the PE router? router eigrp 100 address-family ipv4 vrf testvpn network 10.0.0.0 redistribute bgp 65100 metric 10000 100 255 1 1500 ! output omitted
A. The autonomous-system as-number command is missing under the address-family.
B. The network 10.0.0.0 command should be configured under the router eigrp configuration mode and not under the address-family.
C. The redistribute bgp 65200 metric 10000 100 255 1 1500 command should be configured under the router eigrp configuration mode and not under the address-family.
D. The address-family ipv4 vrf testvpn command should be changed to address-family vpnv4 vrf testvpn.
E. The EIGRP AS number (100) does not match the BGP AS number (65100).
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 49
Lab.
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QUESTION 75
What is the VPN type where sites of two different companies are connected together via Frame Relay virtual circuits?
A. Overlay intranet VPN
B. Overlay extranet VPN
C. Peer-to-peer access VPN
D. Peer-to-peer Internet VPN
E. MPLS simple VPN
F. MPLS overlapping VPN
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 76
Which VPN implementation is achieved with technology such as Frame Relay and ATM?
A. Layer 1 overlay VPN
B. Layer 2 overlay VPN
C. Layer 3 overlay VPN
D. Peer-to-peer VPN
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 77
Which term is used to describe a VPN in which the service provider does not participate in the customer routing?
A. MPLS simple VPN
B. overlay VPN
C. shared PE peer-to-peer VPN
D. dedicated PE peer-to-peer VPN
E. MPLS complex VPN
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: From the Layer 3 perspective, the P-network is invisible to the customer routers, which are linked with emulated point-to-point links. The routing protocols runs directly between customer routers that establish routing adjacencies and exchange routing information. The service provider is not aware of customer routing and has no information about customer routes. The responsibility of the service provider is purely the point-to-point data transport between customer sites. Reference: Cisco Press – Implementing Cisco MPLS Study guide p.4-21
QUESTION 78
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 sitestogether.