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2021 Aug 4A0-108 exam guide
Q51. Which of the following PIM messages are sent via unicast? (Choose two)
A. (*.G) Join/Prune
B. (S.G) Join/Prune
C. Register
D. Candidate-RP-Advertisement
Answer: CD
Q52. Which of the following statements regarding mCAC is false?
A. Multicast CAC allows a service provider to guarantee the availability of mandatory IPTV channels
B. The aim of multicast CAC is to maintain the quality of existing IPTV channels by rejecting new channel joins when required
C. Multicast CAC measures the current bandwidth utilization on the physical links and then decides whether to accept a new channel or not
D. Multicast CAC policy can be applied to VPLS SAP and SDP with IGMP-snooping
Answer: C
Q53. 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
Q54. 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
Answer: B
Q55. 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
Leading 4A0-108 actual test:
Q56. Which one of the following services is provided by the use of PIM as a multicast routing protocol?
A. Authentication
B. Guaranteed Delivery
C. Device Security
D. Preventing packet forwarding loops
E. Preventing Denial of Service attacks
Answer: D
Q57. Which of the following statements about MLD snooping is false?
A. MLD snooping enables switches to forward multicast data to specific hosts that want to receive the data
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, not query messages
Answer: D
Q58. If a router receives a packet addressed to a broadcast destination, it will:
A. Drop the packet by default
B. Forward the packet by default
C. Flood the packet to all ports except the receiving port
D. Flood the packet to all ports including the receiving port
Answer: A
Q59. 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
Answer: B
Q60. 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
Answer: B