IGMP Snooping runs at the data link layer and is used to manage and control multicast groups, and solves the problem of multicast packets being broadcast on Layer 2.

Question

Options

• ATRUE
• BFALSE

• A
  21% (12)
• B
  79% (45)

Explanation

Option B (FALSE) is correct because the statement contains a key inaccuracy: IGMP Snooping does not manage and control multicast groups - that is the role of IGMP itself, which operates at Layer 3 (the Network layer). IGMP Snooping is a passive, Layer 2 switch feature that merely eavesdrops on IGMP messages exchanged between hosts and routers to build a forwarding table of which switch ports have interested multicast receivers.

Option A (TRUE) is wrong because while it's accurate that IGMP Snooping helps prevent multicast flooding on Layer 2, the claim that it "manages and controls multicast groups" incorrectly attributes IGMP's Layer 3 responsibilities to a Layer 2 switch optimization feature.

Memory tip: Think of IGMP Snooping as a nosy switch - it listens in (snoops) on conversations between hosts and routers, then quietly updates its forwarding table to stop flooding multicast everywhere. It doesn't join, leave, or manage groups; it just uses that information to forward smarter. "Snooping" = observing only, not managing.

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