JNCIP-DC: Juniper Networks Certified Professional – Data Center — Question 4

You have two multicast receivers connected to the same VLAN. You notice that the switch that they are connected to is forwarding multicast traffic out of all the ports in the same VLAN, instead of just the two ports for the connected multicast receivers.
In this scenario, what would you configure to optimize multicast forwarding?

Answer options

• A. promiscuous mode
• B. spanning tree
• C. IGMP snooping
• D. IRB interface

Correct answer: C

Explanation

The correct answer is C, IGMP snooping, which allows the switch to listen to IGMP messages and learn which ports are interested in receiving multicast traffic, thus optimizing the forwarding process. Options A (promiscuous mode) and B (spanning tree) do not specifically address multicast traffic management, and D (IRB interface) is unrelated to multicast forwarding optimization.