What is the purpose of dynamically created tunnels using IPv6 multicast?

The correct answer is D. first-hop router registration to the RP. In IPv6 PIM-SM (Protocol Independent Multicast – Sparse Mode), when a new multicast source begins transmitting, the First-Hop Router (FHR) - the router directly connected to the source - dynamically creates a Register tunnel to the Rendezvous Point (RP). This tunnel is used to re

Designing Network Services

Question

Options

Amulticast source registration to the RP
Bbypass of the RPF check to the RP
Ctransport of all IPv6 multicast traffic to the RP
Dfirst-hop router registration to the RP

How the community answered

(29 responses)

B
10% (3)
C
7% (2)
D
83% (24)

Explanation

In IPv6 PIM-SM (Protocol Independent Multicast – Sparse Mode), when a new multicast source begins transmitting, the First-Hop Router (FHR) - the router directly connected to the source - dynamically creates a Register tunnel to the Rendezvous Point (RP). This tunnel is used to register the new source with the RP and to forward encapsulated multicast packets until a shared tree is established. The tunnel is temporary and created solely for this FHR-to-RP registration purpose. Option A is wrong because it is the first-hop router that registers, not the source itself. Option B is wrong because the tunnel does not bypass the RPF check - it is used to carry traffic to the RP. Option C is wrong because the tunnel is not used for all multicast traffic, only for the initial register process.

Topics

#IPv6 multicast#dynamic tunnels#RP registration#first-hop router

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