| Question 1 | With a _________, each destination receives a separate packet. A. Unicast B. Broadcast C. Multicast
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| A1: | Answer A is correct. With a unicast, each destination receives a separate packet. With a broadcast or multicast, each destination receives the same packet, making answers B and C incorrect. |
| Question 2 | Which multicast address is used to send information to all RPs in a subnet? A. 224.0.0.1 B. 224.0.0.2 C. 224.0.0.5 D. 224.0.0.6
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| A2: | Answer B is correct. When information needs to be sent to all RPs on a segment, use 224.0.0.2 as a multicast address. 224.0.0.1 is the all-host group (all devices), making answer A incorrect. Answers C and D are incorrect because OSPF uses these addresses. |
| Question 3 | What protocol is used by an RP to discover which end stations want to receive multicast traffic? A. PIM B. CGMP C. ICMP D. IGMP
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| A3: | Answer D is correct. IGMP is used to determine what clients are participating in multicast groups. Answer A is incorrect because PIM is used to route multicast traffic. Answer B is incorrect because CGMP is used to help switches learn locations of multicast clients. Answer C is incorrect because this is used to test IP connections. |
| Question 4 | In IGMPv2, the router with the _________ IP address is elected as the active querier. |
| A4: | Answer A is correct. The IGMPv2 active querier is elected based on the RP with the lowest IP address. Because it is the lowest, answer B is incorrect. |
| Question 5 | Which version of IGMP allows a client to determine which sources can be used for multicast feeds? A. v1 B. v2 C. v3 D. v2 and v3
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| A5: | Answer C is correct. IGMPv3 supports INCLUDE and EXCLUDE report messages, where an EXCLUDE report message can be used to specify the source addresses wanted for a specific multicast feed. Therefore, answers A, B, and D are incorrect. |
| Question 6 | Which distribution tree uses a rendezvous point to build a single-tree structure for multicast routing? A. PIM B. Source C. Shared D. CGMP
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| A6: | Answer C is correct. Shared distribution trees have a rendezvous point that's used to build a single-tree instance for all multicast traffic. Answer A is incorrect because PIM is used to route multicast traffic it isn't a tree structure. Answer B is incorrect because source-based trees have a separate tree structure for each multicast feed. Answer D is incorrect because CGMP is used by switches to learn about participating multicast clients. |
| Question 7 | The president of your company will be making a live presentation on Friday at 3 p.m. and every employee needs to see it. In what mode would you configure PIM for this multicast feed? |
| A7: | Answer B is correct. Use dense mode if most clients need to see the multicast feed. Sparse mode is used when only a few, geographically dispersed clients need to see a feed, making answer A incorrect. |
| Question 8 | PIM-DM uses ______ to build its distribution tree. |
| A8: | Answer C is correct. Reverse path forwarding is used to build PIM-DM's tree. Answer A is incorrect because spanning tree is used by switches to remove Layer 2 loops. Answer B is incorrect because IGMP is used to discover multicast participating clients. Answer D is incorrect because a rendezvous point is used in PIM-SM. |
| Question 9 | Which method is recommended to control the switching of multicast traffic? |
| A9: | Answer D is correct. CGMP is recommended to intelligently switch multicast traffic. VLANs and static multicast CAM entries don't scale well, making answers A and C incorrect. IGMP snooping has performance problems on lower-end switches, making answer B incorrect. |
| Question 10 | If you have two multicast feeds, one where everyone needs to see the multicast feed and the other where only a handful need to see it, which PIM mode would you use with the ip pim Interface command? A. dense-mode B. sparse-mode C. sparse-dense-mode D. spare-and-dense-mode
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| A10: | Answer C is correct. When you have different multicast feeds with different user needs, use the ip pim sparse-dense-mode command. Answer A is incorrect because dense-mode should be used only when all devices need to see all multicast feeds. Answer B is incorrect because sparse-mode should be used when only a small number of users need to see all multicast feeds. Answer D is incorrect because it is a nonexistent parameter. |
