ACSP ACSP - Aruba Certified Switching Professional Multicast and IGMP Snooping Questions and Answers 1 — Questions and Answers
Question 1: What is the primary purpose of IGMP snooping on an AOS-CX switch?
- To route multicast traffic between VLANs
- To limit multicast traffic to only ports with interested receivers (Correct answer)
- To convert multicast traffic to unicast
- To block all multicast traffic at the access layer
Correct 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.
Question 2: Which multicast address range is reserved for link-local scope and is never forwarded by routers?
- 224.0.0.0 to 224.0.0.255 (Correct answer)
- 224.1.0.0 to 224.1.255.255
- 239.0.0.0 to 239.255.255.255
- 232.0.0.0 to 232.255.255.255
Correct 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.
Question 3: On AOS-CX, which command enables IGMP snooping under a VLAN interface context?
- ip igmp enable
- ip igmp snooping (Correct answer)
- multicast igmp-snooping enable
- vlan igmp snooping enable
Correct answer: ip igmp snooping
The command `ip igmp snooping` is used under the VLAN interface context to enable IGMP snooping on AOS-CX switches.
Question 4: What is the primary function of an IGMP querier on a subnet?
- It blocks multicast traffic from entering the network
- It periodically sends IGMP queries to discover multicast group members (Correct answer)
- It routes multicast traffic between subnets
- It converts IGMPv1 messages to v2 format
Correct 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.
Question 5: Which version of IGMP introduced support for Source-Specific Multicast (SSM), allowing receivers to specify a source address?
- IGMPv1
- IGMPv2
- IGMPv3 (Correct answer)
- IGMPv4
Correct answer: IGMPv3
IGMPv3 introduced the ability for hosts to specify source addresses, enabling Source-Specific Multicast (SSM).
Question 6: When IGMP snooping is enabled on an AOS-CX switch and no hosts have joined any multicast group, where is unknown multicast traffic forwarded?
- To all ports in the VLAN
- The traffic is dropped immediately
- Only to statically configured receiver ports
- Only to mrouter (multicast router) ports (Correct answer)
Correct 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.
ACSP ACSP - Aruba Certified Switching Professional Multicast and IGMP Snooping Questions and Answers 1
What is the primary purpose of IGMP snooping on an AOS-CX switch?