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An administrator is implementing a multicast solution in a multi-VLAN network. Which statement is true about the configuration of the switches in the network?
A.
IGMP snooping must be enabled on all interfaces on a switch to intelligently forward traffic
B.
IGMP requires join and leave messages to graft and prune multicast streams between switches
C.
IGMP must be enabled on all routed interfaces where multicast traffic will traverse
D.
IGMP must be enabled on all interfaces where multicast sources and receivers are connected
Looks like C is correct. Found a PDF the specifically says this. Google "AOS-CX switch igmp", first result (pdf), then go to "Multicast Deployment Summary".
A - incorrect. This is configured globally on the switch, not per-interface.
B - incorrect. This is a PIM function. Not IGMP.
D - incorrect. IGMP is enabled on L3 interfaces towards the sources/receivers. Not ALL interfaces.
D is correct. IGMP is enabled only on clients and multicast servers VLAN. PIM is enabled on routed interfaces between clients and servers VLAN to route multicast flow
A is false because IGMP snooping is enable on vlan and not on interface
B is false because Graft & Prune are used by PIM
D is false because they sayd only "interface" and not "routed interface", IGMP cannot be enable on switch interface, only on "routed interface"
C seems to be correct
Page 567 Study Guide:
A querier is required for proper IGMP operation. For this reason, you must enable IGMP on the L3 Interface. If the querier functionality is not configured or disabled, you must ensure that there is an IGMP querier in the same VLAN.
[Aruba Networks]
I think D is correct
A - incorrect, switches will always forward traffic
B - Graft and Prune are PIM functions
C - IGMP is only required on the VLAN where the receivers and source are connected, PIM is required across L3 domains. IGMP manages flooding of multicast on a segment.
D - Correct - VLAN interfaces where source and receivers are connected
None of these are correct. I'm going to assume they are talking about VLAN interfaces, and go with answer D if I get this question on the test. https://i.imgur.com/vW7V2UL.png
in the picture you shared is saying that "igmp enable snooping optional but recommended" but answer "D" is saying it must be enabled. so D is not correct
D is correct. See "AOS-CX Multicast deployment and troubleshooting guide" page 8 Multicast Deployment Summary point 6: "Enable IGMP/MLD on L3 interfaces towards receiver subnets"
C - Book states "If you want the benefits of IGMP in VLAN 30, you must enable it on the routed interface for VLAN 30" and "You enable IGMP on a per VLAN basis."
the question is specifically asking for switch config, so I think D is correct.
What is mentioned in B happens anyway (with version 3 IGMP) without any extra config being done. i.e. Without IGMP in place PIM will not work.
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