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Question 289 - 350-601 discussion

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A content delivery network sends video traffic to a multicast distribution device where the receiver requests the traffic from the multicast distribution device through an IGMP join message When the traffic reaches the multicast routing device from a CDN the switching network populates the multicast routing table in the group (S G) and the multicast distribution device sends the required traffic back to the receiver. Which feature is used to send back the trafic from the streamer to the receiver in the group (S G)?

A.

RP

Answers
A.

RP

B.

IGMP

Answers
B.

IGMP

C.

Reverse Path Forwarding

Answers
C.

Reverse Path Forwarding

D.

Source Specific Multicast

Answers
D.

Source Specific Multicast

Suggested answer: C

Explanation:

Reverse Path Forwarding (RPF) is a feature used in IP multicast routing that ensures multicast traffic is sent back to the receiver efficiently and without looping. In the context of a content delivery network (CDN) sending video traffic, when a receiver requests traffic through an IGMP join message, the multicast routing device uses RPF to populate the multicast routing table with the correct source (S) and group (G) information. RPF checks the source of the incoming packet against the multicast routing table and forwards the packet only if it arrives on the interface that leads back to the source. This mechanism prevents traffic loops and ensures that the multicast distribution device sends the required traffic back to the receiver along the most efficient path.

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asked 10/10/2024
Rob Kennis
31 questions
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