Which two characteristics unique to SSM when compared to ASM are true? (Choose two.)

Question

Options

• AIt uses SPT switchover
• BIt uses (*,G) exclusively
• CIt uses IGMPv3
• DIt uses RP
• EIt uses (S,G) exclusively

• A
  4% (2)
• B
  2% (1)
• C
  87% (46)
• D
  8% (4)

Explanation

SSM (Source-Specific Multicast) differs from ASM (Any-Source Multicast) in two key ways. First, SSM uses IGMPv3 (Option C) because hosts must specify both the group address and the source address in their join requests-IGMPv3's INCLUDE mode enables this source-specific join. ASM uses IGMPv1/v2, which only specifies the group. Second, SSM uses (S,G) entries exclusively (Option E)-traffic is forwarded only along a source-specific shortest-path tree from the start, with no shared tree phase. Option A (SPT switchover) is an ASM characteristic where receivers switch from the shared tree to the source tree after a threshold is exceeded. Option B ((*,G) entries) is exclusive to ASM, representing shared-tree state toward the RP. Option D (Rendezvous Point) is also an ASM concept-SSM eliminates the need for an RP entirely because the source is known at join time.

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