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Question 132 - 350-601 discussion

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Refer to the exhibit.

Refer to the exhibit. A host with source address 10.10.10.10. sends traffic to multicast group 239.1.1.1. how do the vPC switches forward the multicast traffic?

A.

If multicast traffic is received on Po11 Switch2, the traffic is forwarded out only one Po20.

Answers
A.

If multicast traffic is received on Po11 Switch2, the traffic is forwarded out only one Po20.

B.

If multicast traffic is received on Po10 Switch1, the traffic is forwarded out on Po1 and Po20.

Answers
B.

If multicast traffic is received on Po10 Switch1, the traffic is forwarded out on Po1 and Po20.

C.

If multicast traffic is received on Po11 and Switch2, the traffic is dropped.

Answers
C.

If multicast traffic is received on Po11 and Switch2, the traffic is dropped.

D.

If multicast traffic is received on Switch over the vPC peer-link, the traffic is dropped.

Answers
D.

If multicast traffic is received on Switch over the vPC peer-link, the traffic is dropped.

Suggested answer: B

Explanation:

In a vPC (Virtual Port Channel) configuration, multicast traffic is handled based on the IGMP (Internet Group Management Protocol) and PIM (Protocol Independent Multicast) configurations. When a host sends traffic to a multicast group, the vPC switches determine the forwarding path based on the multicast routing table and the RPF (Reverse Path Forwarding) check.

Option B is correct because when multicast traffic with source address 10.10.10.10 targeting group 239.1.1.1 is received on Po10 Switch1, the switch will perform an RPF check and forward the traffic out of the interfaces that lead to the Rendezvous Point (RP) and the receivers. This ensures that the multicast traffic is efficiently distributed to all receivers that are part of the multicast group. The traffic would be forwarded out on Po1, which is typically connected to the RP, and Po20, which connects to other receivers in the network.

asked 10/10/2024
Gregory Destrebecq
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