Four routers in a domain are configured as BSR candidate. Router A is configured with a
BSR priority of 10, Router B is configured with a BSR priority of 100. Router C and Router
D are at the default value. Router D has the highest IP address. Which router will be elected the PIM BSR?
A. Router A
B. Router B
C. Router C
D. Router D
Answer : B
Question 2 ( Topic 1 )
Refer to the exhibit.
Which router is this screen capture taken from?
A. Any router in the PIM multicast domain
B. Only from the Candidate-RP
C. Only from the Candidate-BSR
D. Only from the elected BSR
Answer : A
Question 3 ( Topic 1 )
Refer to the exhibit.
Which router is this screen capture taken from?
A. Any router in the PIM multicast domain
B. Only from the Candidate-RP
C. Only from the Candidate-BSR
D. Only from the elected BSR
Answer : D
Question 4 ( Topic 1 )
An Alcatel-Lucent 7750 SR is unable to locate a multicast source address in the multicast forwarding table. However, the source address is available in the unicast forwarding table.
Which statement best describes the default RPF check behavior of the 7750 SR?
A. The RPF check will fail as PIM relies exclusively on the multicast forwarding table by default
B. The RPF check will not fail, as by default PIM uses the multicast forwarding table first for RPF check, if not found in the multicast forwarding table then refers to unicast forwarding table
C. The RPF check will not fail as PIM uses only the unicast forwarding table by default
D. The RPF check will fail as the RPF check requires that the source address be present in both the unicast and multicast forwarding table
E. Not enough information is provided to answer the question
Answer : C
Question 5 ( Topic 1 )
Refer to the exhibit.
The switch is not igmp-snooping/proxy capable. What will happen if host 2 issues an IGMP report to join a group?
A. Both Router A and Router B will get this IGMP report and Router B will propagate a PIM join towards the core network
B. Both Router A and Router B will get this IGMP report and both of them will propagate a PIM join towards the core network
C. Only Router A will get this IGMP report and Router A will propagate a PIM join towards the core network
D. Only Router A will get this IGMP report and as Router A is not PIM DR, so no further action
Answer : A
Question 6 ( Topic 1 )
Refer to the configuration exhibit.
Which of the following statements is true?
A. 2 static RP's cannot be configured on the same device
B. 10.10.10.24 will be RP for 230.1.1.1 and 10.10.10.66 will be RP for 234.1.1.1
C. 10.10.10.24 will be RP for 234.1.1.1 and 10.10.10.66 will be RP for 230.1.1.1
D. 2 static RP's both with override cannot be configured on the same device
Answer : C
Question 7 ( Topic 1 )
How do the routers in the PIM domain become aware of the address of the elected BSR?
A. It is unicast to them
B. It is flooded through the network in a bootstrap message
C. It is preconfigured on all routers
D. It is flooded through the network in the PIM Hello
Answer : B
Question 8 ( Topic 1 )
Choose the statements that describe Bootstrap Router mechanism. (Choose three)
A. It is a mechanism to distribute RP-set information dynamically
B. The bootstrap router gets and propagates RP information via multicast messages
C. The bootstrap router gets and propagates RP information via unicast and multicast messages
D. BSR relies on timers to discover that an RP-Candidate router is no longer available
E. For BSR to work, every router in the multicast network should be configured as BSR candidate
Answer : A,C,D
Question 9 ( Topic 1 )
Refer to the configuration exhibit.
Channel 239.1.1.1, 239.1.1.2, 239.1.1.3 and 239.1.1.5 have already been established.
What will happen when this router receives two IGMP reports to join group 239.1.1.4 and
239.1.1.8?
A. Channel 239.1.1.4 will be established while 239.1.1.8 will not
B. Channel 239.1.1.8 will be established while 239.1 1.4 will not
C. Both of these two channels will be established
D. Neither of these two channels will be established
Answer : B
Question 10 ( Topic 1 )
Which of the following statements is false regarding BSR and RP?
A. A router may be both a candidate-BSR and candidate-RP
B. A router configured as a candidate-BSR may also be configured as a static RP
C. A router configured as a candidate-RP may be also be configured as a static RP
D. A converged multicast network with BSR may have multiple routers elected as BSRs
E. A converged multicast network with BSR may have multiple routers elected as RPs
Answer : D
Question 11 ( Topic 1 )
How does a Candidate-RP send its information to the BSR?
A. Using PIM address 224.0.0.13
B. It is unicast to all the BSR candidates
C. It is flooded by all PIM routers
D. It is unicast to the elected BSR
Answer : D
Question 12 ( Topic 1 )
Refer to the exhibit.
Which one of the following descriptions is correct, assuming that all the IGMP join, PIM join and multicast traffic are for the same multicast group?
A. IGMP is enabled on Router A and B's interfaces facing the switch. PIM is not enabled on Router A and B's interfaces facing the switch. IGMP snooping is enabled on the switch.
B. IGMP is enabled on Router A and B's interfaces facing the switch. PIM is not enabled on Router A and B's interfaces facing the switch. IGMP snooping is not enabled on the switch.
C. IGMP is enabled on Router A and B's interfaces facing the switch. PIM is enabled on Router A and B's interfaces facing the switch. IGMP snooping is enabled on the switch.
D. IGMP is enabled on Router A and B's interfaces facing the switch. PIM is enabled on Router A and B's interfaces facing the switch. IGMP snooping is not enabled on the switch.
Answer : B
Question 13 ( Topic 1 )
When a BSR message with a higher priority is seen, will a new BSR election occur?
A. No, the new election only occurs when the elected BSR fails
B. Yes, after a bootstrap message wait interval
C. Yes, immediately
D. Depends on the local configuration of whether to allow the new election or not
Answer : C
Question 14 ( Topic 1 )
Which of the following is true regarding the IPv4 multicast address format?
A. The first 3 bits of the address set to '110'
B. A value between 223.0.0.0 and 239.255.255.255
C. The first 4 bits of the address set to '1111'
D. A subnet mask to indicate the network and host portion of the address
E. The first 4 bits of the address set to '1110'
Answer : E
Question 15 ( Topic 1 )
An end station receiving a broadcast packet will always process the data up to at least which layer of the OSI stack?
A. Layer 1
B. Layer 2
C. Layer 3
D. Layer 4
E. Layer 7
Answer : C
Question 16 ( Topic 1 )
Which of the following statements are true? (Choose three)
A. A multicast network may have only one source and one receiver segment
B. A multicast network may have one source and multiple receiver segments
C. A multicast network cannot have more than one source segments
D. A multicast network may have multiple source and multiple receiver segments
E. A multicast network cannot have more than one receiver segments
Answer : A,B,D
Question 17 ( Topic 1 )
Which MAC address will the IPv4 multicast address 233.103.42.11 be translated to?
A. 01-00-5e-66-3a-6b
B. 01-00-5e-75-2a-0b
C. 01-00-5e-67-2a-0b
D. 00-01-5e-a1-2a-6b
E. 00-01-5e-67-2a-0b
F. 00-01-5e-76-2b-cc
Answer : C
Question 18 ( Topic 1 )
Which MAC address will the IPv4 multicast address 239.231.42.11 be translated to?
A. 01-00-5e-66-3a-6b
B. 01-00-5e-75-2a-0b
C. 01-00-5e-67-2a-0b
D. 00-01-5e-a1-2a-6b
E. 00-01-5e-67-2a-0b
F. 00-01-5e-76-2b-cc
Answer : C
Question 19 ( Topic 1 )
Which of the following data delivery models are most applicable to multicast data delivery?
(Choose two)
A. One to one
B. Many to all
C. One to many
D. Many to many
E. One to all
Answer : C,D
Question 20 ( Topic 1 )
What is the OUI field of the MAC address for IPv4 multicast address?
A. 00-01-5e
B. 00-01-5f
C. 01-00-5e
D. 01-00-5f
Answer : C
Question 21 ( Topic 1 )
Which of the following statements is false?
A. For multicast delivery, the source will send a single copy of each packet regardless of the number of receivers
B. For unicast delivery, the source will send a single copy of each packet regardless of the number of receivers
C. For broadcast delivery, the source will send a single copy of each packet regardless of the number of receivers
D. For anycast delivery, the source will send a single copy of each packet regardless of the number of receivers
Answer : B
Question 22 ( Topic 1 )
Which of the following is a reason why using unicast flows to send data to multiple receivers is not a scalable solution?
A. The resources required by the sending device increases with each new receiver that is added
B. Unicast is based on TCP which is not scalable
C. Servers cannot deliver multiple simultaneous unicast flows
D. Routers do not forward broadcast traffic
Answer : A
Question 23 ( Topic 1 )
Which two of the following addresses should not be used in a multicast network at the same time?
A. 239.99.12.35
B. 237.87.12.35
C. 231.57.12.35
D. 229.227 12.35
E. 228.139.12.35
Answer : A,D
Question 24 ( Topic 1 )
What is the purpose of GLOP addressing?
A. Allocate each AS a unique range of Inter-domain multicast addresses
B. Define an addressing structure for inside a domain
C. Provide a solution for the depletion of addresses
D. Eliminate the problem of IP multicast addresses overlapping when converted to multicast MAC addresses
Answer : A
Question 25 ( Topic 1 )
What is the IPv6 Multicast Address range?
A. FF00::/8
B. FF00::/16
C. FE00::/8
D. FE00::/16
Answer : A
Question 26 ( Topic 1 )
What is the destination address for MLDv2 report?
A. FF02::1
B. FF02::2
C. FF02::16
D. The specific multicast group address which the host is interested in
Answer : C
Question 27 ( Topic 1 )
In IPv6 multicast ASM mode, which of the following methods cannot be used to obtain the
RP address?
A. Static
B. Router solicitation message
C. Bootstrap message
D. Embedded RP
Answer : B
Question 28 ( Topic 1 )
The network administrator of 2001:DB8:FEED::/64 wants to embed an RP for the network and the RP's address is 2001 :DB8:FEED::7. Which of the following multicast address ranges would suit this purpose? (The exhibit of Group-to-RP Mapping is just for your reference)
A. FF7x:730
DB8:FEED::/96(x is scope)B. FF7x:730
DB8:FEED::/80(x is scope)C. FF7x:740
DB8:FEED::/96(x is scope)D. FF7x:740
DB8:FEED::/80(x is scope)Answer : C
Question 29 ( Topic 1 )
Which of the following ranges is reserved for IPv6 SSM multicast address?
A. FF1X::/16
B. FF3X::/16
C. FF3X::/96
D. FF7X::/16
Answer : C
Question 30 ( Topic 1 )
Refer to the exhibit.
According to the PIM configuration on SR-3, can the receiver in the diagram receive multicast traffic from the source for group FF70:340
:1000? Assume all the other configurations are correct.A. Yes. The configuration of PIM is correct and the receiver should get traffic from the source
B. No. The configuration of PIM is no problem, but the scope of the group address used to send traffic is wrong
C. No. As the "rpf6-table" command is missing
D. No. As the embedded-rp group-range is wrong
Answer : B
Question 31 ( Topic 1 )
Which of the following multicast packets can be forwarded on 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
Answer : B
Question 32 ( Topic 1 )
What is the destination address for MLDv2 general query?
A. FF02::1
B. FF02::2
C. FF02::16
D. The multicast group address which the router assumes its hosts might have interest in.
Answer : A
Question 33 ( Topic 1 )
IGMP version 3 Host Membership Queries are sent with a TTL of 1 to which of the following addresses?
A. 224.0.0.0
B. 224.0.0.1
C. 224.0.0.2
D. 224.0.0.13
E. 224.0.0.22
Answer : B
Question 34 ( Topic 1 )
How does IGMP snooping eliminate multicast flooding on the LAN?
A. The switch populates multicast source addresses into the forwarding table
B. The switch acts as an IGMP proxy for the receiver
C. The switch inspects IGMP messages between receivers and routers and populates the forwarding table with active multicast group addresses
D. The switch inspects all multicast traffic between receivers and routers and populates the forwarding table with active multicast group addresses
Answer : C
Question 35 ( Topic 1 )
Refer to the configuration exhibit.
What will happen when this router receives an IGMPv3 exclude none report for group
232.1.1.1?
A. The router will propagate a (*, 239.1.1.1) join towards RP if it exists
B. The router will randomly pick a source from 192.168.1.1 and 192.168.1.2 and send an (S, G)join towards the source
C. The IGMPv3 report will be dropped and a log about misconfiguration will be generated
D. The router will send a PIM (192.168.1.1,232.1.1.1) Join
Answer : D
Question 36 ( Topic 1 )
Refer to the following exhibit.
Assuming all links have an equal metric in the IGP, where will the Shared Path Tree be built when Receiver 3 joins the multicast group?
A. Router G-E-C
B. Router G-E-C-A
C. Router G-E-D-B-A
D. There is insufficient information to answer
Answer : A
Question 37 ( Topic 1 )
Refer to the following exhibit.
Assuming all links have an equal metric in the IGP, where will Source Path Tree have been created if Receiver 2 and Receiver 3 have joined the multicast group and the source is sending and the switchover has occurred? (Choose two)
A. Router F-D-B-A
B. Router G-E-C-A
C. Router C-E-D-B-A
D. Router G-E-C
E. Router F-D-E-C
Answer : A,B
Question 38 ( Topic 1 )
What is the function of the MDT?
A. It is how PIM neighbors become aware of each other
B. It is how receivers signal the source
C. It is the path to the RP
D. It is the multicast data forwarding path
E. It is the path to the DR
Answer : D
Question 39 ( Topic 1 )
What impact will 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 and therefore the RPF check will not be done
C. There will be no impact since the shared and source path trees are built from the receiver to the source
D. There is not enough information provided to answer the question
Answer : C
Question 40 ( Topic 1 )
How many multicast groups may a single receiver join at any one time?
A. 1
B. 2
C. 4
D. 256
E. As many as the operating system and software allow
Answer : E
Question 41 ( Topic 1 )
Where is the best placement of the Rendezvous Point in a PIM SSM network?
A. As close as possible to the multicast source
B. The Rendezvous Point is not required in a PIM SSM network
C. In the redundant core
D. As close as possible to the receiver
E. The Rendezvous Point can be positioned at any router without impact
Answer : B
Question 42 ( Topic 1 )
Refer to the following configuration exhibit.
How many interfaces have receivers joining group 239.1.1.1?
A. 1
B. 2
C. 3
D. There is insufficient information to answer
Answer : D
Question 43 ( Topic 1 )
Which of the following commands will verify the PIM DR on an interface on the Alcatel-
Lucent 7750 SR?
A. Show router pim status
B. Show router pim neighbor
C. Show router pim interface
D. Show router pim statistics
Answer : C
Question 44 ( Topic 1 )
Refer to the following exhibit.
The interfaces' IGP metric is as shown and PIM is using unicast table for RPF-check. What will happen when Router B receives the register message on its interface facing Router A?
A. Discard the register message as RPF-check fails
B. Forward the register message to Router D (RP) according to its routing table
C. Forward the register message out of all the interfaces in its (", 239.1.1.1) entry's outgoing interface list
D. Forward the register message out of all the interfaces in its (192.168.1.1, 239.1.1.1) entry's outgoing interface list
Answer : B
Question 45 ( Topic 1 )
Which of the following configuration steps are mandatory for IPv4 PIM ASM to work?
(Choose two)
A. Configure PIM on core and source facing interfaces
B. Configure PIM on access facing interfaces
C. Configure RP statically or via BSR
D. Create and apply register and join policies
E. Define the rpf-table
Answer : A,C
Question 46 ( Topic 1 )
Four routers share a multi-access network. Router A is configured with a PIM DR priority of
10, Router B is configured with a PIM DR priority of 100, Router C and Router D are at the default value. Router D has the highest IP address. Which Router will be elected the PIM
DR?
A. Router A
B. Router B
C. Router C
D. Router D
Answer : B
Question 47 ( Topic 1 )
An IGMP version 3 receiver signals EXCLUDE mode with an empty EXCLUDE list. What does this indicate?
A. This is the initial join message and exclusions of sources will follow
B. It is willing to receive traffic from any source
C. This is the initial join message and a selection of source will follow
D. This is the way it indicates it is leaving the group
Answer : B
Question 48 ( Topic 1 )
Select the statements that relate to the Shared Path Tree. (Choose three)
A. The RP is the root of the tree
B. The multicast source is the root of the tree
C. It is represented by (*, G) entries
D. It is represented by (S, G) entries
E. The path between receiver and source is always the shortest path
F. It is always created as a result of switchover
G. It is the initial forwarding path created
Answer : A,C,G
Question 49 ( Topic 1 )
When forwarding a multicast frame, normal behavior for a LAN switch (without IGMP snooping enabled) is to forward the frame as if it were:
A. A unicast frame with a known destination in the forwarding table
B. A unicast frame with an unknown destination in the forwarding table
C. A unicast frame with a known source in the forwarding table
D. A unicast frame with an unknown source in the forwarding table
Answer : B
Question 50 ( Topic 1 )
Refer to the following exhibit.
Assume all links have an equal metric in the IGP. Receiver 2 and Receiver 3 have joined the multicast group and the source is not sending. Where will the Shared Path Tree have been created? (Choose two)
A. Router G-E-C
B. Router F-D-E-G
C. Router F-D-E-C
D. Router C-A
E. Router F-D-B-A
F. Router G-E-C- A
G. No Shared Path Tree will have been created
Answer : A,C
Question 51 ( Topic 1 )
What is the position of the router shown in the exhibit?
A. The RP
B. The first hop router from the source
C. The router where the Source and Shared Path Trees diverge
D. An upstream router from the diverging router on the Shared Path Tree
Answer : C
Question 52 ( Topic 1 )
How many responses should be received if IGMP version 3 is in use and a router sends a
Query to a specific multicast group that has 6 active receivers on the local broadcast domain?
A. 1
B. 2
C. 6
D. 7
E. It will be random
Answer : C
Question 53 ( Topic 1 )
Which of the following commands will verify, either directly or indirectly, if PIM is configured on an interface on the Alcatel-Lucent 7750 SR? (Choose two)
A. show router pim interface
B. show router pim status detail
C. show router pim status
D. show router interface detail
Answer : A,D
Question 54 ( Topic 1 )
Refer to the following exhibit.
Assume all links have an equal metric in the IGP. Receiver 2 and Receiver 3 have joined the multicast group and the source is sending. Where will the Shared Path Tree have been created before switchover? (Choose two)
A. Router G-E-C
B. Router F-D-E-G
C. Router F-D-E-C
D. Router C-A
E. Router F-D-B-A
F. Router G-E-C-A
G. No Shared Path Tree will have been created
Answer : A,C
Question 55 ( Topic 1 )
Which of the following statements best describes the behavior seen in the network when a receiver joins a multicast channel in the PIM ASM network shown in the exhibit?
A. Both Router B and Router C will propagate a PIM (*, G) Join to the RP when a receiver joins
B. Only Router B will propagate a PIM (*.G) Join to the RP when a receiver joins
C. Only Router C will propagate a PIM(\G) Join to the RP when a receiver joins
D. Depends on the next hop for RP in Router D's RPF table
Answer : D