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What is the purpose of RPF check on an IP multicast network?

Created: Feb 6, 2022 09:23:36Latest reply: Feb 6, 2022 19:28:43 214 6 0 0 0
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What is the purpose of RPF check on an IP multicast network? (single answer)


A. Establishing a reverse multicast forwarding path from the receiver to the source

B. Preventing multicast traffic loops on the network

C. Determining the status of interfaces in the outbound interface list

D. Preventing unauthorized multicast traffic from being forwarded


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Funstuff
Moderator Author Created Feb 6, 2022 10:26:45

Hi. The answe is A.

When a router receives the first multicast packet of a stream, it selects an optimal route from the unicast routing table based on the source address of the packet. The outbound interface of the unicast route is an RPF interface, and the next hop of the route is the RPF neighbor. The router compares the inbound interface of the packet with the RPF interface of the selected RPF route. If the inbound interface is the same as the RPF interface, the router considers that the packet has arrived on the correct path from the source and forwards the packet downstream. If the inbound interface is different from the RPF interface, the packet fails the RPF check. The router considers that the packet is received from an incorrect interface and discards the packet
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hemin88
hemin88 Created Feb 6, 2022 10:34:37 (1) (0)
Well done  
Funstuff
Funstuff Reply hemin88  Created Feb 6, 2022 10:39:19 (0) (0)
Thanks  

Recommended answer

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fuzi_yao
Admin Created Feb 6, 2022 09:35:41

Hi, friend!
The answer is A

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Thomas_Tan
Thomas_Tan Admin Created Feb 6, 2022 09:32:00

Hello, dear.

It's nice to meet you in the community.

We're working on getting the right answer for you. Please rest assured that we'll be back with an answer shortly.
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fuzi_yao
fuzi_yao Admin Created Feb 6, 2022 09:35:41

Hi, friend!
The answer is A

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4#
Funstuff
Funstuff Moderator Author Created Feb 6, 2022 10:26:45

Hi. The answe is A.

When a router receives the first multicast packet of a stream, it selects an optimal route from the unicast routing table based on the source address of the packet. The outbound interface of the unicast route is an RPF interface, and the next hop of the route is the RPF neighbor. The router compares the inbound interface of the packet with the RPF interface of the selected RPF route. If the inbound interface is the same as the RPF interface, the router considers that the packet has arrived on the correct path from the source and forwards the packet downstream. If the inbound interface is different from the RPF interface, the packet fails the RPF check. The router considers that the packet is received from an incorrect interface and discards the packet
View more
  • x
  • convention：

hemin88
hemin88 Created Feb 6, 2022 10:34:37 (1) (0)
Well done  
Funstuff
Funstuff Reply hemin88  Created Feb 6, 2022 10:39:19 (0) (0)
Thanks  
(0) (0)
5#
Saqibaz
Saqibaz Created Feb 6, 2022 19:28:43

The answer is A
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