IGMP Snooping cannot solve the bandwidth waste of multicast traffic on Layer 2 switches. That is, whether IGMP Snooping is configured on Layer 2 switches has no impact on multicast traffic.

Question

Options

• ATRUE
• BFALSE

• A
  20% (13)
• B
  80% (52)

Explanation

B (FALSE) is correct because IGMP Snooping is specifically designed to address multicast bandwidth waste on Layer 2 switches. Without it, switches treat multicast like broadcast, flooding all ports with multicast traffic regardless of whether hosts on those ports want it. With IGMP Snooping enabled, the switch inspects IGMP messages between hosts and routers, builds a membership table, and forwards multicast streams only to ports with interested receivers - directly reducing unnecessary bandwidth consumption.

Why A is wrong: The claim that IGMP Snooping has "no impact" is the opposite of reality. It has a significant and measurable impact by converting multicast from flood behavior to selective forwarding.

Memory tip: Think of IGMP Snooping as a switch "eavesdropping" on group membership conversations - because it snoops, it knows exactly who wants the multicast stream and stops wasting bandwidth sending it to everyone else.

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