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2021 Oct 4A0-108 exam guide
Q1. 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
Q2. The first actions of a router after enabling PIM on the interfaces will be:
A. BSR elections followed by DR elections
B. DR elections followed by PIM Hello messages
C. DR elections followed by BSR elections
D. BSR elections followed by PIM Hello messages
E. PIM Hello messages followed by BSR elections
F. PIM Hello messages followed by DR elections
Answer: F
Q3. Refer to the exhibit.
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
Q4. 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
Q5. 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
Up to the minute 4A0-108 training:
Q6. 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 FF1E::1234? 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. As the "rpf6-table" command is missing
C. No. As the rp configuration is missing. There should be at least one RP selection method from static, bsr or embedded-rp
D. No. As the "no IPv6-multicast-disable" command is missing
E. B, C and D
Answer: D
Q7. Which MAC address will the IPv4 multicast address 224.128.0.1 be translated to?
A. 01-00-5e-80-00-01
B. 01-00-5e-22-41-40
C. 01-00-5e-22-28-01
D. 00-01-5e-80-00-01
E. 01-00-5e-00-00-01
F. 00-01-5e-22-28-01
Answer: E
Q8. 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
Q9. If the access network supports IGMP version 2 only, what additional configuration is required to enable the SSM model?
A. IGMP snooping
B. IGMP compatibility mode support
C. IGMP version 2 to IGMP version 3 translations
D. IGMP (*, G) Join to PIM (S. G) Join translation
E. PIM ASM to PIM SSM translations
Answer: D
Q10. 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: B