ACSP ACSP - Aruba Certified Switching Professional Multicast and IGMP Snooping Questions and Answers 2 — Questions and Answers
Question 1: What is the benefit of enabling IGMP fast-leave on an AOS-CX switch port?
- It speeds up IGMP query response timers
- It immediately removes a port from a multicast group upon receiving a leave message without waiting for a group-specific query (Correct answer)
- It accelerates multicast routing convergence across VLANs
- It reduces the IGMP general query interval
Correct answer: It immediately removes a port from a multicast group upon receiving a leave message without waiting for a group-specific query
IGMP fast-leave allows the switch to immediately remove a port from a multicast group upon receiving a leave message, without waiting for a group-specific query response.
Question 2: What is the default IGMP general query interval on AOS-CX, as defined by the IGMPv2 and v3 standards?
- 30 seconds
- 60 seconds
- 125 seconds (Correct answer)
- 180 seconds
Correct answer: 125 seconds
The default IGMP query interval is 125 seconds, matching the standard defined in RFC 2236 for IGMPv2.
Question 3: Which AOS-CX command displays the multicast groups and associated member ports learned via IGMP snooping?
- show ip igmp groups
- show ip igmp snooping groups (Correct answer)
- show multicast groups
- show igmp membership
Correct answer: show ip igmp snooping groups
The `show ip igmp snooping groups` command displays the multicast groups and associated ports learned via IGMP snooping on AOS-CX.
Question 4: How does an AOS-CX switch dynamically identify a port as an mrouter (multicast router) port when IGMP snooping is enabled?
- By detecting CDP or LLDP advertisements from the router
- By receiving IGMP queries or PIM hello messages on that port (Correct answer)
- By observing high volumes of multicast traffic ingressing the port
- By matching the port MAC address against a configured list
Correct answer: By receiving IGMP queries or PIM hello messages on that port
An mrouter port is dynamically identified by receiving IGMP query messages or PIM hello messages, indicating a multicast-capable router is reachable via that port.
Question 5: When IGMP fast-leave is disabled and the last leave message is received for a group, what action does the AOS-CX switch take before removing the port?
- Immediately removes the port from the group
- Sends a group-specific query to confirm no remaining members exist before removing the port (Correct answer)
- Floods traffic to all VLAN ports temporarily
- Drops all subsequent multicast traffic for that group
Correct answer: Sends a group-specific query to confirm no remaining members exist before removing the port
Without fast-leave, the switch sends a group-specific query after receiving a leave message to confirm no other receivers exist before removing the port.
Question 6: Which well-known multicast address does IGMPv2 use to address the All-Routers group?
- 224.0.0.1
- 224.0.0.2 (Correct answer)
- 224.0.0.9
- 224.0.0.5
Correct answer: 224.0.0.2
IGMPv2 uses 224.0.0.2 as the All-Routers multicast address for sending group membership queries to all routers on the subnet.
ACSP ACSP - Aruba Certified Switching Professional Multicast and IGMP Snooping Questions and Answers 2
What is the benefit of enabling IGMP fast-leave on an AOS-CX switch port?