Refer to the exhibit. There are multiple trees in the Cisco FabricPath. All switches in the Layer 2 fabric share the same view of each tree. Which two concepts describe how the multicast traffic is…

Question

Exhibit

Options

• AA specific (S.G) traffic is not load-balanced
• BAll trees are utilized at the same level of the traffic rate
• CEvery leaf node assigns the specific (S.G) to the same tree.
• DA specific (S.G) multicast traffic is load-balanced across all trees due to better link utilization
• EThe multicast traffic is generally load-balanced across all trees

• A
  9% (5)
• B
  64% (36)
• C
  21% (12)
• E
  5% (3)

Explanation

In Cisco FabricPath, multiple multi-destination trees are built across the Layer 2 fabric. All switches in the fabric share a consistent view of each tree. Multicast traffic is load-balanced by assigning different (S,G) flows to different trees using a hash-based algorithm - every switch in the fabric applies the same hash, so they all agree on which tree carries which (S,G). Choice B is correct because, with enough (S,G) flows distributed across the available trees, all trees end up carrying traffic - the hash distributes the load so that no single tree is idle while others are congested. Choice D is correct because the mechanism of mapping each (S,G) to a specific tree results in effective load balancing across the entire fabric, achieving better link utilization than a traditional single-tree (STP) model would allow. Choice A is partially true (a given individual (S,G) flows on exactly one tree, not all trees simultaneously), but this reflects the per-flow mechanism rather than the load-balancing outcome. Choice C is also true (all leaf nodes assign the same (S,G) to the same tree), but it describes the consistency property rather than how load balancing is achieved. Choice E is a general statement that is less precise than B and D in explaining the actual mechanism.

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