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Frequently Asked Questions
Question # 1
A BSR candidate message is seen with a higher priority than the existing BSR. Which of the following describes the action that occurs?
A. The higher priority router becomes the BSR only after the existing BSR fails.
B. The higher priority router becomes the BSR after the bootstrap message wait interval.
C. The higher priority router becomes the BSR immediately.
D. There is a BSR configuration parameter that determines whether or not there is a BSR election in this case.
Question # 2
Which of the following is NOT a function of Intra-AS I-PMSI A-D route?
A. To advertise the P-tunnel type to be used for the I-PMSI.
B. To advertise the group address for the I-PMSI.
C. To provide MVPN auto-discovery and binding within a single AS domain.
D. To advertise the customer multicast group address.
Question # 3
Click the exhibit. Assume that I-PMSI uses PIM ASM and the I-PMSI group address is G. How many MM(S,G) entries are on PE1?
A. Only one, and S is PE1.
B. Only one, and S is MC source server's IP address.
C. Only one, and S is P (RP).
D. Three, and S is PE1, PE2 and PE3 respectively.
Question # 4
Click the exhibit. Based on the output shown, which of the following is correct?
A. The I-PMSI group address is 239.1.1.10.
B. The S-PMSI group address is 239.1.1.10.
C. This PE has no receiver.
D. The system IP address of this PE is 10.10.10.1.
Question # 5
In the Alcatel-Lucent SROS, which BGP address family is configured to support MCASTVPN NLRI?
A. vpn-ipv6
B. vpn-ipv4
C. mvpn-ipv6
D. mvpn-ipv4
Question # 6
Which of the following about Draft Rosen MVPN is TRUE?
A. In Draft Rosen MVPN, each CE maintains a PIM adjacency to its remote CE routers.
B. In Draft Rosen MVPN, customer multicast group addresses in different VRFs cannotoverlap.
C. Draft Rosen MVPN encapsulates customer multicast traffic in GRE tunnels.
D. In Draft Rosen MVPN, PE routers exchange customer multicast routing information byMP-BGP.
Question # 7
Which of the following regarding VRF Route Import extended community is TRUE?
A. It is used to support UMH selection in Inter-AS MVPN.
B. It is a new extended community added only to MVPN multicast routes.
C. It contains Global Administrator and Local Administrator fields.
D. It contains the AS number of the source PE.
Question # 8
Which of the following regarding the use of RSVP-TE P2MP LSP as MVPN I-PMSI isTRUE?
A. If RSVP-TE P2MP LSP is used as I-PMSI, either mLDP or RSVP-TE P2MP LSP can beused as S-PMSI.
B. The signaling protocol used for S-PMSI is independent of that used for I-PMSI.
C. If the signaling protocol used for I-PMSI is RSVP-TE, BGP must be used for signalingcustomer multicast information.
D. The protocol used for signaling customer multicast information is independent of thatused for the I-PMSI.
Question # 9
What is the destination address of the MLDv2 report message?
A. FF02::1
B. FF02::2
C. FF02::16
D. The specific multicast group address that the host is interested in.
Question # 10
Four routers in a domain are configured as BSR candidates. Router A is configured with aBSR priority of 10; Router B is configured with a BSR priority of 100; Router C and RouterD are at the default value. Router D has the highest IP address. Which router will beselected as the BSR?
A. Router A
B. Router B
C. Router C
D. Router D
Question # 11
What is the destination address of the MLDv2 general query?
A. FF02::1
B. FF02::2
C. FF02::16
D. The multicast group address of the multicast data that the router is receiving
Question # 12
Which protocol is used to establish the I-PMSI in Draft Rosen?
A. PIM DM
B. PIM ASM
C. PIM SSM
D. Either PIM ASM or PIM SSM
Question # 13
Which of the following about BGP Auto Discovery in an MVPN is TRUE?
A. If BGP Auto Discovery is used, MPLS LSPs must be used for the P-tunnels in theMVPN.
B. PIM state is maintained between PEs in the MVPN without PIM Hello messages.
C. MP-BGP keepalive messages are used to maintain adjacencies between the PEs in anMVPN.
D. MP-BGP can also be used as the multicast signaling protocol between the PEs andCEs.
Question # 14
How many types of Auto-Discovery routes are defined for MCAST-VPN NLRI?
A. 3
B. 5
C. 7
D. 9
Question # 15
Which of the following is NOT an advantage of NG MVPN over Draft Rosen?
A. MP-BGP is more scalable than PIM.
B. Unicast and multicast traffic in the same VPRN service can use the same transporttunnel.
C. P routers in the core do not need to maintain any PIM group states.
D. An MPLS tunnel can be used instead of a GRE tunnel.
Question # 16
Which of the following describes a purpose of MP-BGP as used in NG MVPN?
A. Building GRE tunnels to carry multicast traffic.
B. Building MPLS tunnels to carry multicast traffic.
C. Allowing a PE to discover the other PE routers in an MVPN.
D. Exchanging multicast routing information between CE routers.
Question # 17
Which of the following multicast packets can be forwarded in the Internet?
A. A multicast packet destined to FF70::1234.
B. A multicast packet destined to FF1E::1234.
C. A multicast packet destined to FF02::1234.
D. A multicast packet destined to FF3A::1234.
Question # 18
Which of the following best describes the PMSI (provider multicast service interface) in anMVPN service?
A. The PMSI is the interface between the PEs and CEs in an MVPN service.
B. The PMSI is an overlay broadcast network that interconnects all PEs in an MVPNservice.
C. The PMSI is the PIM-enabled interface between the PEs in an MVPN service.
D. The PMSI is the GRE tunnel that carries customer multicast traffic across the serviceprovider core network.
Question # 19
Click the exhibit. Based on the output, which of the following is correct?
A. The S-PMSI group address is 239.1.1.10.
B. The I-PMSI group address is 239.1.1.10.
C. The S-PMSI group address is 239.1.1.20.
D. The I-PMSI group address is 239.1.1.20.
Question # 20
Click the exhibit. Based on the display, which of the following regarding MVPN 100 is TRUE?
A. BGP is used to signal customer multicast routing information, while PIM is used todiscover PEs.
B. PIM is used to signal customer multicast routing information, while BGP is used todiscover PEs.
C. BGP is used to signal customer multicast routing information and discover PEs.
D. PIM is used to signal customer multicast routing information and discover PEs.
Question # 21
Which of the following regarding the BGP Shared Tree Join route is TRUE?
A. The PE with a receiver for C-multicast group sends a BGP Shared Tree Join update tothe PE attached to the C-RP.
B. The PE with a receiver for C-multicast group sends a BGP Shared Tree Join update tothe RP in the provider core network.
C. The PE attached to C-RP sends a BGP Shared Tree Join update to the C-RP.
D. The PE attached to C-RP sends a BGP Shared Tree Join update to the PE attached tothe source.
Question # 22
What impact does an asymmetric IGP routing topology have on the PIM RPF check?
A. The PIM RPF check may fail, since traffic from the source may arrive on one interface,while the IP route to the source may point to another interface on the PIM router.
B. PIM does not work in an asymmetric topology, therefore there is no RPF check at all.
C. There is no impact, since the Shared and Source Path Trees are built from the receiverto the source.
D. There is not enough information provided here to answer the question.
Question # 23
What is the default version of IGMP on the Alcatel-Lucent 7750 SR?
A. Version 1
B. Version 2
C. Version 3
D. There is no default setting, you must configure the version when you enable IGMP on7750 SR
Question # 24
Click the exhibit. If the configuration shown is applied to all PE routers, and all other configuration iscomplete, how many neighbors are displayed in the output of the command "PE1= showrouter 100 pirn neighbor"?
A. There is one PIM neighbor.
B. There are two PIM neighbors.
C. There are three PIM neighbors.
D. There is no PIM neighbor in router 100. All the PIM neighbors are in the base router.
Question # 25
Four routers share a multi-access network. Router A is configured with a PIM DR priority of10, Router B is configured with a PIM DR priority of 100, Router C and Router D areAlcatel-Lucent 7750 SRs set at the default value. Router D has the highest IP address.Which router is selected as the PIM DR on this multiaccess network?
A. Router A
B. Router B
C. Router C
D. Router D
Question # 26
An IGMP version 3 receiver signals EXCLUDE mode report with an empty EXCLUDE list. What does this indicate?
A. This is the initial join message; a list of sources to exclude will follow.
B. The receiver is willing to receive traffic from any source.
C. The receiver has received the query, but it does not wish to join any group.
D. The receiver is leaving the group.
Question # 27
Which of the following about the S-PMSI A-D route is FALSE?
A. It is sent by the ingress PE when the configured threshold is exceeded.
B. It eliminates the periodic MDT Join.
C. It eliminates the periodic PIM Hello.
D. It signals the multicast group address for the S-PMSI.
Question # 28
Which MAC address does the IPv4 multicast address 239.33.42.107 translate to?
A. 01-00-5e-al-2a-6b
B. 01-00-5e-21-2a-6b
C. 01-00-5e-21-2c-6c
D. 00-01-5e-al-2a-6b
E. 00-01-5e-21-2a-6b
F. 00-01-5e-al-2a-6b
Question # 29
Click the exhibit. According to the display in the exhibit, which of the following statements is TRUE?
A. The S-PMSI is instantiated by MPLS tunnels.
B. The S-PMSI group address range is 232.10.10.0/24.
C. 192.168.1.2 is the system IP address of the source PE.
D. The customer is sending multicast traffic to group 239.1.1.1.
Question # 30
Which of the following about MLD snooping is FALSE?
A. MLD snooping enables switches to forward multicast data to specific hosts interested inthe group.
B. MLD snooping can co-exist with IGMP snooping in the same VPLS service.
C. Once MLD snooping is enabled, the switch can snoop both MLDv1 and MLDv2messages.
D. MLD snooping snoops MLD report and done messages, but not query messages.
Question # 31
How many bits of the IPv4 multicast address directly match bits in the multicast MACaddress?
A. 23
B. 25
C. 27
D. 28
Question # 32
Click the exhibit. The interface's IGP metric is as shown, and PIM is using the unicast table for the RPFcheck. What happens when Router B receives a register message on its interface facingRouter A?
A. Router B discards the register message, as the RPF-check fails.
B. Router B forwards the register message to Router D (RP) according to its routing table.
C. Router B forwards the register message out of all the interfaces in its (',239.1.1.1) entry'soutgoing interface list.
D. Router B forwards the register message out of all the interfaces in its(192.168.1.1,239.1.1.1) entry's outgoing interface list.
Question # 33
Which of the following statements regarding the BSR and RP is FALSE?
A. A router can be configured as both a candidate-BSR and a candidate-RP.
B. A router configured as a candidate-BSR can also be configured as a static RP.
C. A router configured as a candidate-RP can also be configured as a static RP.
D. A converged multicast network with BSR can have multiple routers elected as BSRs.
E. A converged multicast network with BSR can have multiple routers elected as RPs.
Question # 34
How often does a host issue IGMP Host Membership Reports for group 224.0.0.1?
A. Never
B. Every 30 seconds
C. Every 60 seconds
D. Every 120 seconds
E. Every 260 seconds
F. Whenever it receives a query
Question # 35
Click the exhibit. Based on the output displayed, which of the following is FALSE?
A. Fast-reroute one-to-one is enabled in this P2MP LSP-template.
B. This P2MP LSP is established for VPRN 100.
C. Router 1.1.1.1 is a PE participating in VPRN 100.
D. Router 1.1.1.3 is a PE participating in VPRN 100.
Question # 36
Which two protocols are used to signal P2MP LSPs?
A. BGPA-DandRSVP-TE
B. RSVP-TE and mLDP
C. mLDPamd PIM
D. mLDP and BGP A-D
Question # 37
Which of the following PIM messages are sent towards the RP? (Choose two)
A. (*, G) Join/Prune
B. (S, G) Join/Prune
C. Register Stop
D. (S, G, rpt) Join/Prune
Question # 38
An end station receiving a broadcast packet processes the data up to at least which layerof the OSI stack?
A. Layer 1
B. Layer 2
C. Layer 3
D. Layer 4
E. Layer 7
Question # 39
The Draft-Rosen S-PMSI address range is configured for 32 group addresses. Whathappens if there are more than 32 customer multicast flows that exceed the thresholdconfigured for the MVPN?
A. Traffic for the 33rd multicast flow is dropped.
B. Traffic for the 33rd multicast flow is transmitted on the I-PMSI.
C. The source PE reassigns the S-PMSI with the smallest flow to the new multicast flow.Traffic for the smaller flow is transmitted on the I-PMSI.
D. The source PE re-uses an S-PMSI that is currently in use for the 33rd flow. Traffic forboth flows is sent on the same S-PMSI.
Question # 40
Click the exhibit. The network administrator of 2001 ;DB8:FEED::/64 wants to embed an RP for the network.The RP's address is 2001:DB8:FEED::7. Which of the following multicast address rangeswould suit this purpose? (The exhibit shows the group-to-RP mapping for your referenceonly.)
A. FF7x:730:2001:DBS:FEED::/96 (x is scope)
B. FF7x:730:2001:DBS:FEED::/80 (x is scope)
C. FF7x: 740:2001:DB8:FEED::/96 (x is scope)
D. FF7x:740:2001:DB8:FEED::/80(x is scope)
Question # 41
In Draft Rosen, a PE router encapsulates customer multicast packets into provider packets.What source IP address is used for the provider packets?
A. The system IP address of the originating PE router.
B. The source IP address of the customer packet.
C. The outgoing interface IP address of the originating PE router.
D. The source IP address specified in the MVPN configuration.
Question # 42
How many responses are received when a router sends an IGMP version 3 query to aspecific multicast group with 6 active receivers on the local broadcast domain?
A. 1
B. 2
C. 6
D. 7
Question # 43
Which of the following describes UMH (Upstream Multicast Hop) selection?
A. It is the process of finding the remote PE connected to the C-root of the multicast tree.
B. It is the process of finding the remote CE connected to the C-root of the multicast tree.
C. It is the RPF check for the multicast traffic received from remote PEs in the MVPN.
D. It is the RPF check for the multicast traffic received from local CEs in the MVPN.
Question # 44
Which of the following about the use of BGP A-D in a MVPN service is TRUE?
A. If the I-PMSI is signaled by BGP A-D, then the S-PMSI must be signaled by BGP A-D.
B. If the I-PMSI is signaled by PIM, then the S-PMSI must be signaled by BGP A-D.
C. Customer group membership must be signaled by BGP A-D.
D. Customer group membership must be signaled by BGP A-D or PIM.
Question # 45
Click the exhibit. What happens when the displayed router receives an IGMPv3 exclude none report forgroup 232.1.1.1?
A. The router propagates a (:,:, 232.1.1.1) join towards RP if it exists.
B. The router sends a PIM (S, G) join toward both sources: 192.168.1.1 and 192.168.1.2.
C. The IGMPv3 report is dropped and a misconfiguration message is generated in log 99.
D. The router sends a PIM (192.168.1.1, 232.1.1.1) join toward the source.
Question # 46
Which of the following best describes how S-PMSI construction is initiated in Draft Rosen?
A. The ingress PE sends an MDT Join TLV in the I-PMSI for a group address from theconfigured range.
B. The egress PE sends an MDT Join TLV in the I-PMSI for a group address from theconfigured range.
C. The ingress PE sends a PIM Join in the I-PMSI for a group address from the configuredrange.
D. The egress PE sends a PIM Join in the I-PMSI for a group address from the configuredrange.
Question # 47
Which of the following are characteristics of the one-to-many model of multicast datadelivery? (Choose two)
A. Receivers are generally unknown by the source.
B. Receivers are generally known by each other.
C. It is well suited for applications in which the receivers provide feedback to each otherand the source.
D. There is a single data flow for each group on the source segment.
E. All devices are potentially capable of generating multicast data.
F. It is well suited for applications such as video on demand, where each source sends aseparate data stream to each of the many different receivers.
Question # 48
Which of the following is NOT a benefit of multicast for delivering data to multiplereceivers?
A. Its data delivery is more efficient than unicast and broadcast.
B. It is more scalable than unicast and broadcast.
C. It suits VoD (Video on Demand) services very well.
D. It suits BTV (Broadcast TV) services very well.
Question # 49
Click the exhibit. VPRN 100 is an MVPN with RSVP-TE P2MP LSP P-tunnels. How many PATH messagesare signaled by PE1 for I-PMSI?
A. 1
B. 2
C. 3
D. It depends on the number of receivers
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