300-365 · Question #18
300-365 Question #18: Real Exam Question with Answer & Explanation
The correct answer is B: unicast AP Multicast Mode. With 500 APs in multicast AP multicast mode, the WLC relies on IP multicast routing infrastructure that may not be properly configured, causing uncontrolled multicast flooding throughout the network. Switching to unicast AP multicast mode directs traffic as individual unicast pac
Question
Options
- Acontroller IGMP snooping
- Bunicast AP Multicast Mode
- Cbroadcast forwarding
- Dmulticast AP Multicast Mode
Explanation
With 500 APs in multicast AP multicast mode, the WLC relies on IP multicast routing infrastructure that may not be properly configured, causing uncontrolled multicast flooding throughout the network. Switching to unicast AP multicast mode directs traffic as individual unicast packets to each AP, eliminating network-wide multicast flooding.
Common mistakes.
- A. Controller IGMP snooping manages IGMP group membership on the WLC but does not address the root cause of multicast traffic being replicated and flooded across the wired infrastructure between the controller and all 500 APs.
- C. Broadcast forwarding handles the distribution of broadcast frames to wireless clients but has no effect on how the WLC delivers multicast traffic to APs or reduces multicast-related CPU and network utilization overhead.
- D. Multicast AP Multicast Mode is the configuration that requires functional IP multicast routing in the wired network - it is the likely cause of the observed spike in a network without proper multicast infrastructure, not the solution.
Concept tested. WLC AP multicast mode selection and scalability
Reference. https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/multicast.html
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