ACSP - Aruba Certified Switching Professional Multicast and IGMP Snooping Questions and Answers Flashcards
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What is the primary purpose of IGMP snooping on an AOS-CX switch?
Answer: To limit multicast traffic to only ports with interested receivers
IGMP snooping allows the switch to inspect IGMP messages and forward multicast traffic only to ports where receivers have joined the group.
Which multicast address range is reserved for link-local scope and is never forwarded by routers?
Answer: 224.0.0.0 to 224.0.0.255
The 224.0.0.0/24 range is reserved for link-local multicast, used by routing protocols, and is never forwarded by routers.
On AOS-CX, which command enables IGMP snooping under a VLAN interface context?
Answer: ip igmp snooping
The command `ip igmp snooping` is used under the VLAN interface context to enable IGMP snooping on AOS-CX switches.
What is the primary function of an IGMP querier on a subnet?
Answer: It periodically sends IGMP queries to discover multicast group members
The IGMP querier sends periodic General Query messages to discover which hosts on a subnet are members of multicast groups.
Which version of IGMP introduced support for Source-Specific Multicast (SSM), allowing receivers to specify a source address?
Answer: IGMPv3
IGMPv3 introduced the ability for hosts to specify source addresses, enabling Source-Specific Multicast (SSM).
When IGMP snooping is enabled on an AOS-CX switch and no hosts have joined any multicast group, where is unknown multicast traffic forwarded?
Answer: Only to mrouter (multicast router) ports
When IGMP snooping is enabled and no group memberships exist, unknown multicast traffic is forwarded only to mrouter ports to avoid flooding all access ports.