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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?
A. router ospf 11 vrf purple redistribute bgp 1 network 172.16.0.0.0.0.255.255 area 0
B. router ospf 11 address-family ipv4 purple redistribute bgp 1 subnets network 172.16.0.0.0.0.255.255 area 0
C. router ospf 11 vrf purple redistribute bgp 1 subnets network 172.16.0.0.0.0.255.255 area 0
D. router ospf 11 ip vrf purple redistribute bgp 1 subnets network 171.16.0.0.0.0.255.255 area 0
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 292
What is true about using EBGP between the PE and CE routers?
A. Redistribution to MP-BGP is still required.
B. Customer BGP attributes are not maintained across the VPN.
C. All customer BGP attributes are maintained across the VPN.
D. Redistribution to MP-BGP is not required.
Correct Answer: CD Section: (none) Explanation
Explanation/Reference: QUESTION 293
If several MPLS VPN customer sites run BGP and want to use the same AS number throughout there would normally be a problem since standard BGP operation is to reject incoming external routes that contain the local AS number in their AS-path. What is a BGP facility that provides a workaround to this problem?
A. AS-cutthrough
B. AS-override
C. AS-passthrough
D. AS-transparent
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 294
How many labels are required as a minimum for an MPLS VPN?
A. 4
B. 1
C. 3
D. 2
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 295
What is true about the use of RIP between the PE and CE routers?
A. A separate routing context is configured for each VRF running RIP.
B. RIP parameters for each VRF can be configured globally.
C. It supports RIPv1 and RIPv2.
D. Routes have to be redistributed to and from BGP.
Correct Answer: AC Section: (none) Explanation
Explanation/Reference:
Explanation:
RIPv1 CAN be used but NOT supported officially by Cisco.
QUESTION 296
How would you display the routing table for a VRF named “yellow”?
A. sh ip vrf-route yellow
B. sh ip route vrf yellow
C. sh ip route yellow
D. sh ip route mp-bgp
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 297
Which is NOT a possible function of BGP in an MPLS VPN environment?
A. The exchange of traditional global IPV4 routes.
B. The distribution of labels throughout the P network.
C. The exchange of VPN routes with a customer using either EBGP or redistribution to another protocol.
D. The exchange of VPNv4 routes.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 298
When must the BGP next-hop-self option be set in an MP-IBGP session between PE’s?
A. When BGP between the PE’s is also carrying standard communities.
B. When All routers run in the same AS.
C. When EBGP is running between the PE and CE routers.
D. When EBGP is not running between the PE and CE routers.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 299
Which of the following label operations can be performed by an edge LSR?
A. Pop
B. Push
C. Swap
D. Purge
Correct Answer: AB Section: (none) Explanation
Explanation/Reference:
QUESTION 300
What is true about a CE router?
A. It exchanges VPNv4 routes with other routers.
B. It participates in customer routing protocols.
C. It runs provider backbone IGP.
D. It has to run BGP.
E. It has no direct customer connectivity.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 301
In a PE the VRF tables are populates by?
A. Routing information from the associated CE router.
B. MP-BGP information from other PE’s.
C. The core IGP.
D. BGP-4 information from P routers.
Correct Answer: AB Section: (none) Explanation
Explanation/Reference:
QUESTION 302
VPNv4 addresses are exchanged between ______?
A. PE and P routers
B. PE routers
C. PE and CE routers
D. CE routers
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 303
Within a PE router one VRF should be assigned per ______ ?
A. PE router
B. Site
C. VPN
D. Group of sites with the same VPN connectivity
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 304
Given the configuration below which type of MPLS connectivity would this normally support? int atm 0/0 atm pvp 37 int atm 0/0.37 point-to-point mpls ip
A. ATM switch to ATM enabled router over an ATM VP.
B. ATM switch to ATM switch over an ATM VP.
C. ATM enabled router to ATM enabled router over an ATM VP.
Correct Answer: AB Section: (none) Explanation
Explanation/Reference:
QUESTION 305
How does MPLS VPN architecture allow for overlapping address space between customers?
A. The addresses are kept unique by prefixing them with a route distinguisher.
B. The addresses do not class because a separate routing process is used for each customer within the MPLS network.
C. A separate PE router is provided for each customer.
D. Customers have to use registered addresses, they cannot overlap.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 306
What type of VPN could be described as one in which a provider offers virtual point to point links between customer sites?
A. Peer to peer VPN
B. Remote access VPN
C. Overlay VPN
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 307
Which of the following are valid business categorizations for VPN’s?
A. Intranet VPN
B. Internet VPN
C. Extranet VPN
D. Access VPN
Correct Answer: ACD Section: (none) Explanation
Explanation/Reference:
QUESTION 308
Which command would you use to display information about the TDP session and the addresses and ports being used?
A. show mpls tdp-sessions detail
B. show tag-switching tdp neighbors
C. show tag-switching neighbors
D. show mpls tdp-sessions
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 309
The default control VC an LC-ATM is 0/32 how would you change this to 2/32?
A. (config-if)#tag-switching atm vpi 2 32
B. (config-if)#tag-switching atm control-vc 2 32
C. (config-if)#tag-switching atm control-vc 2/32
D. (config)#tag-switching atm control-vc 2 32
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 310
Which command would you use to disable TTL propagation?
A. (config)#no mpls ttl-propagate
B. (config-if)#no mpls ip propagate-ttl
C. (config)#no mpls ip propagate-ttl
D. (config)#no ip mpls ttl-propagate
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 311
What is the effect of the use of the hop-count TLV in cell mode MPLS to the traceroute command?
A. Traceroute still accurately indicates the number of hops in the MPLS path.
B. Traceroute will indicate the ingress router to an MPLS domain once for each hop through the MPLS path and not the core MPLS LSR’s.
C. Traceroute will accurately indicate each router in the MPLS path.
D. Traceroute will not indicate any of the MPLS domain routers including the ingress and egress routers.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: Mode MPLS. Page 91 of the reference states “…Although the previous description provides all the necessary functionality for traceroute to work in a Farme-mode MPLS environment, you also need to consider the effects of traceroute across an MPLS network that is constructed with ATM-LSRs in the topology. Chapter 1, “Multiprotocol Lable Switching (MPLS) Architecture Overview,” defines an ATM-SLR as an LSR with a number of LC-ATM interfaces that forward cells between these interfaces using labels carried in the VPI/VCI field. The consequence of this is that TTL is not available in the header of an ATM cell and, therefore CANNOT BE MANIPULATED AT EACH HOP in the network. For this reason, when ATM-SLRs are within the path, the ATM portion of the network is TREATED AS ONE IP HOP.” Reference: MPLS and VPN Architectures (CCIP edition)
QUESTION 312
Which of the following are names of valid fields in the MPLS header?
A. Label
B. B bit
C. TTL
D. TOS
Correct Answer: AC Section: (none) Explanation
Explanation/Reference:
QUESTION 313
What is true about disabling TTL propagation into an MPLS domain? (Select all that apply.)
A. It has to be disabled on all LSR’s in the MPLS path.
B. The TTL field in the label is set to 0.
C. The TTL field in the label is not copied into the IP header on egress.
D. The TTL field in the label is not copied from the TTL field in the IP header on ingress.
Correct Answer: CD Section: (none) Explanation
Explanation/Reference:
Explanation:
Not A: Option A is incorrect as it only needs to be turned off at ingress router.
QUESTION 314
What is true about penultimate hop popping?
A. It works on cell and frame mode MPLS networks.
B. It allows double lookup on the egress router which is more efficient.
C. It prevents the need for double lookup on an egress router.
D. It causes the label to be popped one hop earlier.
Correct Answer: CD Section: (none) Explanation
Explanation/Reference:
QUESTION 315
Which MPLS mode of label retention allows all received labels to be stored not just the ones from a next hop neighbor?
A. Independent
B. Ordered
C. Liberal
D. Conservative
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 316
What is the order of significance for determining the IP address portion of a TDP identifier?
A. The highest interface IP address.
B. The value of the “tag tdp router-id” statement.
C. The highest loopback IP address B, A, C
D. C, A, B
E. B, C, A
F. A, C, B
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 317
Which of the following modes of operation would be used for packet (or frame) mode MPLS?
A. per-interface label allocation
B. unsolicited label distribution
C. liberal label retention
D. ordered control
Correct Answer: BC Section: (none) Explanation
Explanation/Reference:
QUESTION 318
What is true about OSPF running between PE and CE routers?
A. Extra configuration is required to pass the OSPF route attributes from OSPF to MP-BGP.
B. OSPF route attributes are carried as extended BGP attributes into MP-BGP.
C. Extra configuration is required to pass the OSPF route attributes from MP-BGP to OSPF.
D. Routes redistributed from MP-BGP to OSPF automatically maintain OSPF route attributes.
Correct Answer: BD Section: (none) Explanation Explanation/Reference:
QUESTION 319
Which of the following are MPLS applications?
A. Traffic screening/filtering
B. Traffic engineering
C. QOS
D. Web caching
Correct Answer: BC Section: (none) Explanation
Explanation/Reference:
QUESTION 320
Which are valid MP-BGP extended community formats?
A. <type>:<ASnumber>:<Value>
B. <type>:<Prefix>:<Value>
C. <type>:<Areanumber>:<Value>
D. <type>:<IP address>:<Value>
Correct Answer: AD Section: (none) Explanation
Explanation/Reference:
QUESTION 321
When providing Internet access to VPN customers through global routing two options exist at the PE. What are these two options?
A. VPN leaking
B. Packet popping
C. Use a separate (sub) interface for Internet and VPN traffic.
D. Packet leaking
Correct Answer: CD Section: (none) Explanation
Explanation/Reference:
QUESTION 322
In cases where VPN customers use OSPF and have cross domain links to other sites which also connected into the provider network what is true about this situation?
A. The OSPF tag field can be set to prevent cross domain routing loops.
B. This configuration is not supported by MPLS VPN’s.
C. The down bit can be used to prevent cross domain routing loops.
D. The down bit will be reset as routes pass between OSPF domain and may cause routing loops.
Correct Answer: AD Section: (none) Explanation
Explanation/Reference:
QUESTION 323
Which of the following can be performed by an ATM LSR?
A. Pop
B. Swap
C. Push
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 324
What is true about the SOO extended community?
A. SOO is only needed for multihomed customer sites.
B. SOO can be used as a loop prevention mechanism.
C. SOO is most useful for stub sites.
D. SOO has the effect of creating possible loops.
Correct Answer: AB Section: (none) Explanation
Explanation/Reference:
QUESTION 325
What is true about the following configuration in a PE router? Router bgp 21 address-family ipv4 vrf yellow neighbor 10.3.2.1 remote-as 44 neighbor 10.3.2.1 active
A. It configures an MP-BGP neighborship to another PE.
B. It configures an EBGP neighborship to a CE.
C. It configures an IBGP neighborship with a CE.
D. It configures an IBGP neighborship to another PE.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 326
Which is a valid route configuration statement?
A. (config-vrf)#route-target 1234:13 import
B. (config-vrf)#rt import 1234:13
C. (config-vrf)#rt 1234:13 export D. (config-vrf)#route-target both 1234:13
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 327
Which BGP address family configuration statement in a PE router correctly specifies an MP-BGP session to another PE router?
A. (config-router)#ip address-family vpnv4
B. (config-router)#address-family vpnv4
C. (config-router)#address-family ipv4 vrf <vrf name>
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 328
What is true about a routing context?
A. It uses global router variables for all routing instances.
B. It allows a routing protocol run in one VRF.
C. It allows different customers on the same PE to run the same routing protocol.
D. Its allows multiple routing instances in a VRF.
Correct Answer: BC Section: (none) Explanation
Explanation/Reference:
QUESTION 329
What is true about a PE router?
A. It participates in customer routing protocols.
B. It runs provider backbone IGP.
C. It exchanges VPNv4 routes with other routers.
D. It has no direct customer connectivity.
E. It has to run BGP.
Correct Answer: ABCE Section: (none) Explanation
Explanation/Reference:
QUESTION 330
Which are function(s) required in the control plane when using multicast IP routing over MPLS?
A. PIM version 2 with MPLS extensions.
B. A label distribution protocol.
C. A packet forwarding protocol.
D. An IP routing protocol.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 331
Only one route target can be associated with each route. True or false?
A. True
B. False
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 332
Which of the following describes a VPN in which every site can communicate with a server but not with each other?
A. Central services VPN
B. Overlapping VPN
C. Managed network VPN
D. Simple VPN
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 333
What is the name given to an IP address that is extended with an RD?
A. An IPv4 address
B. A VPNv4 address
C. A VPNv2 address
D. A RDv4 address
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 334
Which of the following is NOT a valid topology?
A. Hub and spoke
B. Partial mesh
C. Circular
D. Multilevel
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 335
Which command would you use to display the contents of the LFIB table?
A. show tag-switching lfiv
B. show mpls label-forwarding-table detail
C. show mpls lfib detail
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 336
What is true about the MTU on an interface when running MPLS?
A. The MTU is automatically decreased on WAN interfaces.
B. Some switches do not support jumbo frames.
C. If the MTU is increased on a LAN interface it can result in jumbo frames.
D. The IP MTU is automatically decreased on LAN interfaces.
Correct Answer: BCD Section: (none) Explanation
Explanation/Reference:
QUESTION 337
BGP derived prefixes are assigned the label that is used for the _______?
A. IBGP peer
B. AS-Path
C. IGP prefix in the routing table
D. Next hop address
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 338
What does LDP use to find non adjacent neighbors?
A. Broadcast hello packets
B. Multicast hello packets
C. Specific hello packets
D. Directed hello packets
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 339
Following an exchange of LDP hellos, which router will attempts to establish the LDP session?
A. The router with the highest IP address in the LDP identifier.
B. The router which is the first to receive a hello.
C. They will both try.
D. The router with the lowest IP address in the LDP identifier.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 340
Which mode of label distribution advertises labels to all neighbor LSR’s?
A. Independent
B. Liberal
C. Unsolicited
D. On demand
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 341
What is true about per-platform label allocation over per -interface label allocation?
A. It conservers table space.
B. It conserved VPI/VCI’s in an ATM MPLS network.
C. It is more efficient.
D. It is more secure.
Correct Answer: ABC Section: (none) Explanation
Explanation/Reference:
QUESTION 342
Which customer routing protocols will support MPLS VPN’s?
A. RIP V2
B. RIP V1
C. EIGRP
D. OSPF
E. EBGP
Correct Answer: ABDE Section: (none) Explanation
Explanation/Reference:
Explanation:
B: RIPv1 CAN be used but NOT supported officially by Cisco.
QUESTION 343
Which are the two major components of MPLS?
A. Administrative plane
B. Data plane
C. Routing plane
D. Control plane
Correct Answer: BD Section: (none) Explanation
Explanation/Reference:
QUESTION 344
What is true about the following configuration? ip vrf green rd 100:10 route-target both 100:10 ip vrf blue rd 100:11 route-target both 100:11 ip vrf orange rd 100:12 route target both 100:10 route-target both 100:14
A. Site orange can talk to another site using an RT of 100:14.
B. Site blue cannot talk to site orange.
C. Site orange can talk to site green
D. Site green can talk to site blue.
Correct Answer: ABC Section: (none) Explanation
Explanation/Reference:
QUESTION 345
In cases where VPN customers run OSPF and have areas that are multihomed into a provider network it is
possible for loops to form.
What provision is made to prevent this?
A. Use the OSPF “tag bit” on egress to the multihomed area from the PE.
B. Set the OSPF “down bit” on egress to the multihomed area from the PE.
C. Set the OSPF “down bit” on ingress from the multihomed area to the PE.
D. Use the OSPF “tag bit” on ingress from the multihomed area to the PE.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 346
What is true about the following configuration? ip vrf blue rd 21:222 import map map route-target both 21:222 route-map map permit 10 match ip address 10 access-list 10 permit 172.18.2.0.0.0.0.255
A. Routes will be entered into the vrf table if they satisfy the access list.
B. Routes will be entered into the vrf table if they have RT 21.222 appended to them.
C. Routes will be entered into the vrf table if they satisfy the access list and have only RT 21.222 appended to them.
D. Routes will be entered into the vrf table if they satisfy the access list and have at least RT 21.222 appended to them.
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 347
What is the name given to the MPLS VPN in terms of the OSPF hierarchy?
A. OSPF virtual link
B. OSPF superbackbone
C. OSPF ABR
D. Area 0
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 348
Instead of using a routing protocol between the PE and CE routers it is possible to use static routes in
some cases.
What is true about static routes in MPLS VPN’s?
A. The static routes are on a per VRF basis.
B. You must always specify the outgoing interface.
C. The static routes are not entered into the VRF routing table.
D. The static routes are configured under the bgp address family prompt.
Correct Answer: AB Section: (none) Explanation
Explanation/Reference:
QUESTION 349
Which are valid formats for a route distinguisher?
A. 10.34.231.4:21
B. 10:34:231:4.21
C. 14567.32
D. 121.32
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation:
Not D: option D should not be correct as it is a dot between 121 and 32 not a colon.
QUESTION 350
If a customer who is part of an MPLS VPN is running OSPF, routes are automatically imported from the
OSPF instance in the VRF to BGP for advertisement to other PE’s.
True or false?
A. True
B. False
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 351
Which of the following devices performs the MPLS function at the interface to a cell mode MPLS domain?
A. Edge LSR
B. ATM LSR
C. LSR
D. ATM edge LSR
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 352
What does cell mode MPLS use as a forwarding label?
A. The AAL5 header
B. The ATM header
C. The label
D. The IP header
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 353
Which of the following describes a VPN in which some sites are part of more than one VPN?
A. Simple VPN
B. Overlapping VPN
C. Central services VPN
D. Managed network VPN
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 354
What is true about peer to peer VPN’s? (Select all that apply.)
A. The customer is isolated from the provider network.
B. The provider routers carry all the customers routes.
C. They are easy to implement.
D. They can provide optimum routing between sites.
Correct Answer: BCD Section: (none) Explanation
Explanation/Reference:
Explanation:
Option D is also correct as page 139 states”Routing between the customer sites is always optimal, as the
provider routers know the customers’s network topology and can thus establish optimum inter-site routing.
Reference: MPLS and VPN Architectures (CCIP edition)
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