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4A0-108 Questions and Answers

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4A0-108 Questions and Answers

Question # 6

What issues have to be resolved to support the deployment of SSM? (Choose two)

A.

Allowing the source to select the multicast group address

B.

Creating standards for Directory Services

C.

Allowing the receiver to specify the source address

D.

Modifying the IGMP messaging format to include the multicast source address

E.

Modifying the PIM messaging format to include the multicast source address

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Question # 7

How often will a host issue IGMP Host Membership Reports for group 224.0.0.1?

A.

Never

B.

30 seconds

C.

60 seconds

D.

120 seconds

E.

260 seconds

F.

Whenever it receives a Query

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Question # 8

How often will a router issue IGMP Host Membership Reports for group 224.0.0.2?

A.

Never

B.

30 seconds

C.

60 seconds

D.

120 seconds

E.

260 seconds

F.

A router will never join this group

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Question # 9

Who periodically sends IGMP Host Membership Queries?

A.

The router elected as Querier on a LAN

B.

The first host to expire their local suppression timer

C.

Only the multicast enabled hosts on a LAN

D.

All routers on a LAN

E.

All multicast enabled routers on a LAN

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Question # 10

Which of the following is a characteristic of a packet with a destination address in the Local Network Control Block address range?

A.

A packet with this address is always forwarded throughout the multicast routing domain but never forwarded outside the multicast routing domain

B.

A packet with this address can only be processed by a router

C.

A packet with this address is never forwarded beyond the local link unless the TTL is greater than 1

D.

A packet with this address is never forwarded beyond the local link regardless of the TTL

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Question # 11

How does the RP get the first multicast data packet from source?

A.

Via the Source Path Tree

B.

Via a Register Message which encapsulates the multicast traffic

C.

Via a Bootstrap Message which encapsulates the multicast traffic

D.

Via the Shared Path Tree

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Question # 12

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 on 7750 SR

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Question # 13

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

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Question # 14

How many responses are received when a router sends an IGMP version 3 query to a specific multicast group with 6 active receivers on the local broadcast domain?

A.

1

B.

2

C.

6

D.

7

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Question # 15

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.

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Question # 16

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.

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Question # 17

How many types of Auto-Discovery routes are defined for MCAST-VPN NLRI?

A.

3

B.

5

C.

7

D.

9

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Question # 18

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 receiver to the source.

D.

There is not enough information provided here to answer the question.

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Question # 19

Which of the following fields is used in the PATH message to uniquely identify an S2L Sub-LSP?

A.

P2MPID

B.

Tunnel ID

C.

Extended Tunnel ID

D.

Sub-Group ID

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Question # 20

What is the default action taken by an Alcatel-Lucent 7750 SR when it receives a packet addressed to a broadcast destination?

A.

The router drops the packet.

B.

The router forwards the packet.

C.

The router floods the packet to all ports except the receiving port.

D.

The router floods the packet to all ports, including the receiving port.

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Question # 21

Which of the following about MLD snooping is FALSE?

A.

MLD snooping enables switches to forward multicast data to specific hosts interested in the 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 MLDv2 messages.

D.

MLD snooping snoops MLD report and done messages, but not query messages.

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Question # 22

Which of the following best describes the impact of an RP failure in a PIM ASM network?

A.

All existing multicast traffic is stopped immediately, as the PIM ASM network must have an RP to transmit the multicast traffic.

B.

The multicast traffic will be impacted, but not immediately, as multicast routers will not discover the RP failure until the keep alive timer expires.

C.

No impact at all, as an RP is not required in a PIM ASM network.

D.

The traffic is not impacted if the multicast traffic flows have already been established, and the traffic flow does not involve the RP in the path.

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Question # 23

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

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Question # 24

How many responses are received when a router sends an IGMP version 2 query to a specific multicast group with 6 active receivers on the local broadcast domain?

A.

1

B.

2

C.

6

D.

7

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Question # 25

When forwarding a multicast frame, the normal behavior for a LAN switch with IGMP snooping enabled is to forward the frame based on the similar rules 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

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Question # 26

What signaling protocol is used by a multicast receiver?

A.

IGMP

B.

PIM

C.

Either PIM or IGMP

D.

Both PIM and IGMP

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Question # 27

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

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Question # 28

Which of the following is NOT a benefit of anycast RP?

A.

It provides RP redundancy in a PIM SM network.

B.

It provides load balancing between multiple RPs in the network,

C.

It supports a different multicast topology than the unicast topology.

D.

It supports more optimal routing of the Shared Path Tree by allowing redundant RPs to be located closer to receivers.

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Question # 29

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

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Question # 30

Which MAC address will the IPv4 multicast address 239.33.42.107 be translated to?

A.

01-00-5e-a1-2a-6b

B.

01-00-5e-21-2a-6b

C.

01-00-5e-21-2c-6c

D.

00-01-5e-a1-2a-6b

E.

00-01-5e-21-2a-6b

F.

00-01-5e-a1-2c-6b

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Question # 31

Consider the following addresses. Which two should not be used in a multicast network at the same time?

A.

224.192.12.35 and 238.64.12.35

B.

235.182.12.35 and 235.64.12.35

C.

226.172.12.35 and 238.42.12.35

D.

237.138.12.35 and 238.128.12.35

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Question # 32

Which of the following events could trigger a PIM router sending an (S,G) Join message? (Choose three)

A.

Receiver performing IGMP version 3 (S, G) report

B.

Receiver performing enhanced IGMP version 2 signaling

C.

Router performing PIM Source Path Tree signaling

D.

Router performing translation to convert a standard IGMP (*, G) Join into a PIM (S, G) Join

E.

RP performing translation to convert a PIM (*, G) Join into a PIM (S, G) Join

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Question # 33

An Alcatel-Lucent 7750 SR is unable to locate a multicast source address in the multicast routing table. However, the source address is available in the unicast routing table. Which statement best describes the default RPF check behavior of the Alcatel-Lucent 7750 SR?

A.

The RPF check fails, as PIM relies exclusively on the multicast routing table by default.

B.

The RPF check fails, as it requires the source address be present in both the unicast and multicast routing tables.

C.

The RPF check succeeds, as PIM uses only the unicast routing table by default.

D.

The RPF check succeeds, as PIM uses the multicast routing table first, and then the unicast routing table by default.

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Question # 34

How often does a router issue IGMP Host Membership Reports for group 224.0.0.2?

A.

Never

B.

Every 30 seconds

C.

Every 60 seconds

D.

Every 120 seconds

E.

Every 260 seconds

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Question # 35

Click the exhibit.

Which router is the RP for group 239.1.34.92?

A.

10.10.10.24.

B.

10.10.10.66.

C.

It depends on the setting of the override parameter.

D.

Neither, since the overlapping address range presents a conflict.

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Question # 36

Which protocol is used to establish the S-PMSI in Draft Rosen?

A.

PIM DM

B.

PIM SSM

C.

PIM ASM

D.

Either PIM SSM or PIM ASM

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Question # 37

Which of the following describes how customer multicast routing information is distributed in NG MVPN?

A.

Customer multicast routing information is distributed only with PIM.

B.

Customer multicast routing information is distributed only with MP-BGP.

C.

Customer multicast routing information is distributed with either PIM or MP-BGP.

D.

Customer multicast routing information is distributed with either mLDP or RSVP-TE.

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