Exam N10-008 topic 1 question 213 discussion

At layer 2, if a switch is not multicast-aware, it will treat multicast transmissions as broadcasts and flood them across all ports in the broadcast domain. This can consume a lot of bandwidth and slow down the network. This problem becomes particularly acute if the switch floods multicast traffic to virtual LANs (VLANs) that do not need to receive it. To combat this, IGMP snooping can be enabled as a global option on a switch and as a per-VLAN option. IGMP snooping means the switch reads IGMP messages and can determine if the host on an access port or one or more hosts in a VLAN have joined a multicast group. Multicast traffic is filtered from ports and VLANs that have no hosts participating in the multicast group.

A. Enable IGMP snooping on the switches. Internet Group Management Protocol (IGMP) snooping is a feature that can be used to improve network performance in situations where multicast traffic is causing issues. When IGMP snooping is enabled on a switch, the switch will listen in on IGMP traffic on the network and use this information to learn which hosts belong to which multicast groups.

Used by clients and routers to let routers known which interfaces have multicast receivers:IGMP

VLAN trunking, or port tagging is used for Internet frames & accompanying procedures to be used by bridges & switches in handling such frames. Traffic needs to be properly tagged & divided to the correct trunks for their intended purpose so each department can be used for it's intended function.

I think the problem is that we read port tagging as 'port aggregation'

keyword snooping and switches, snooping like lurking

A. Enable IGMP snooping on the switches. IGMP snooping stands for Internet Group Management Protocol snooping. It is a feature commonly found in network switches that helps optimize multicast traffic distribution. In this scenario, when video streaming is causing a degradation of network performance, enabling IGMP snooping on the switches would be the most likely solution. Multicast traffic, such as video streams, can flood the network if not properly managed. IGMP snooping allows switches to intelligently forward multicast traffic only to the ports where interested receivers are located. By enabling IGMP snooping, the switches can efficiently deliver the video streams to the devices requesting them, reducing unnecessary network congestion and improving overall network performance. Therefore, enabling IGMP snooping on the switches is the most appropriate solution to address the reported degradation of network performance during video streaming.

A. Enable IGMP snooping on the switches is the most likely solution to address the degradation of network performance during video streaming. IGMP snooping is a feature that optimizes multicast traffic by enabling switches to limit the forwarding of multicast traffic only to the ports that have active receivers. When video streaming causes a degradation of network performance, this is often due to multicast traffic flooding all switch ports, even those without active receivers. Enabling IGMP snooping on the switches can reduce this unnecessary traffic, freeing up bandwidth and improving network performance for users. The other options listed, such as implementing another DHCP server, reconfiguring port tagging, or changing the SSID of the APs, may improve network performance in different ways, but are unlikely to specifically address the issue of degraded performance during video streaming.

Mike Meyers "Another approach to mitigating multicast issues is to enable IGMP snooping on your switches. This will prune multicast traffic and let your switches only forward multicast traffic to ports with hosts that are members of a multicast group. IGMP snooping works by letting the switch “listen” for when the host joins a multicast group, and only then will the switch forward frames from that multicast to that host."

IGMP snooping helps to optimize multicast performance and is especially useful for bandwidth-intensive IP multicast applications such as online media streaming. IGMP snooping is enabled by default on your Nighthawk switch

I highly suggest everyone to read this. I'm sure it'll be very helpful https://courses.cs.washington.edu/courses/csep561/97sp/paper1/paper27.txt

IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP) network traffic to control delivery of IP multicasts.

I want to say this can be A instead of C.