Free Practice Questions for Nokia 4A0-108 Exam

Question 1

What message does the diverging router (router where the shared and Source Path Trees diverge) generate to stop the multicast traffic arriving via the RP?

APIM (*, G) Join

BIGMP (*, G) Join

CPIM Hello

DPIM (*, G) RP-bit prune

EPIM (*, G) RP-bit prune

Correct Answer: D. PIM (*, G) RP-bit prune

Question 2

What does the term 'incongruent unicast and multicast routing' refer to? (Choose the best answer)

AThis is another term for asymmetric routing

BThis refers to having different routing policies or routing topologies for unicast and multicast networks

CThis refers to the case when the base routing table imports routes from two different protocols

DThis refers to the case when unicast and multicast routing tables contain the same route entries

Correct Answer: B. This refers to having different routing policies or routing topologies for unicast and multicast networks

Question 3

Which of the following is NOT an advantage of NG MVPN over Draft Rosen?

AMP-BGP is more scalable than PIM.

BUnicast and multicast traffic in the same VPRN service can use the same transport tunnel.

CP routers in the core do not need to maintain any PIM group states.

DAn MPLS tunnel can be used instead of a GRE tunnel.

Correct Answer: D. An MPLS tunnel can be used instead of a GRE tunnel.

Question 4

What is the DATA_DELAY_INTERVAL?

AIt is the delay before the source PE switches traffic from the I-PMSI to the S-PMSI.

BIt is the delay before the source PE sends MDT Join TLVs.

CIt is the delay before the source PE switches traffic from the S-PMSI to the I-PMSI when traffic rate drops below the threshold.

DIt is the delay before the receiver PE prunes the S-PMSI.

Correct Answer: A. It is the delay before the source PE switches traffic from the I-PMSI to the S-PMSI.

Question 5

Refer to the exhibit.

Which router is this screen capture taken from?

AAny router in the PIM multicast domain

BOnly from the Candidate-RP

COnly from the Candidate-BSR

DOnly from the elected BSR

Correct Answer: A. Any router in the PIM multicast domain

Question 6

Which of the following are NOT characteristics of the many to many model of multicast data delivery? (Choose two)

AReceivers are generally unknown by the source

BReceivers are generally known by each other since any receiver may be a source

CWell suited for applications in which the receivers provide feedback to each other and the source

DAll devices are potentially capable of generating multicast data

EWell suited for applications such as video on demand where each source sends a separate data stream to each of the many different receivers

Correct Answer: A. Receivers are generally unknown by the source; E. Well suited for applications such as video on demand where each source sends a separate data stream to each of the many different receivers

Question 7

How many responses should be received if IGMP version 2 is in use and a router sends a Query to a specific multicast group that has 6 active receivers on the local broadcast domain?

A1

B2

C6

D7

EIt will be random

Correct Answer: A. 1

Question 8

Which of the following about BGP Auto Discovery in an MVPN is TRUE?

AIf BGP Auto Discovery is used, MPLS LSPs must be used for the P-tunnels in the MVPN.

BPIM state is maintained between PEs in the MVPN without PIM Hello messages.

CMP-BGP keepalive messages are used to maintain adjacencies between the PEs in an MVPN.

DMP-BGP can also be used as the multicast signaling protocol between the PEs and CEs.

Correct Answer: B. PIM state is maintained between PEs in the MVPN without PIM Hello messages.

Question 9

Which of the following statements about the PIM messages for IPv6 multicast routing is false?

AHello, Join/prune messages use All-PIM-Routers multicast address (FF02 D) as destination

BRegister message uses RP's global unicast IPv6 address as destination

CHello, Join/prune messages use outgoing interface's global unicast IPv6 address as source address

DRegister message uses outgoing interface's global unicast IPv6 address as source address

Correct Answer: C. Hello, Join/prune messages use outgoing interface's global unicast IPv6 address as source address

Question 10

The default version of IGMP on the Alcatel-Lucent 7750 SR is:

AConfigured manually

BVersion 1

CVersion 2

DVersion 3

Correct Answer: D. Version 3

Question 11

Which of the following commands will verify the PIM DR on an interface on the Alcatel-Lucent 7750 SR?

AShow router pim status

BShow router pim neighbor

CShow router pim interface

DShow router pim statistics

Correct Answer: C. Show router pim interface

Question 12

Click the exhibit.

Based on the output shown, which of the following is correct?

AThe I-PMSI group address is 239.1.1.10.

BThe S-PMSI group address is 239.1.1.10.

CThis PE has no receiver.

DThe system IP address of this PE is 10.10.10.1.

Correct Answer: C. This PE has no receiver.

Question 13

Click the exhibit.

What happens when Host 2 issues an IGMP report to join a group?

ABoth Router A and Router B get this IGMP report; Router B propagates a PIM join toward the core network.

BBoth Router A and Router B get this IGMP report, and both propagate a PIM join toward the core network.

COnly Router A gets this IGMP report and propagates a PIM join toward the core network.

DOnly Router A gets this IGMP report, but no further action is taken, as Router A is not the PIM DR.

Correct Answer: A. Both Router A and Router B get this IGMP report; Router B propagates a PIM join toward the core network.

Question 14

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?

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

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

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

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

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

Question 15

Is the RP mandatory in an ASM network?

AYes

BNo

CDepends on whether there is an elected BSR. With an elected BSR, RP is not mandatory. Without an elected BSR, RP is mandatory

DIn IPv4, RP is mandatory for ASM. In IPv6, it is not

Correct Answer: A. Yes