300-510 · Question #289
300-510 Question #289: Real Exam Question with Answer & Explanation
The correct answer is D: Implement SR Tree-SID to build a multicast replication tree over the point-to-multipoint link. In an SR-only core you don’t run PIM or MLDP; instead you use a Tree-SID (SRv6 or SR-MPLS) to instantiate the multicast distribution tree. The Tree-SID automatically replicates packets at P2 down each P2→P3 and P2→P4 branch, delivering the enterprise’s multicast streams to all PE
Question
Refer to the exhibit. The service provider deployed segment routing in its core. P2 is connected to P3 and P4 via a point-to-multipoint link as shown. The service provider provides connectivity for a large enterprise with three main offices in different geographic regions. Each office is connected via one of the three PEs. The enterprise wants to implement multicast traffic across the service provider to stream mission-critical applications between sites. The applications will be sourced from a server connected to the network through PE2. Which action must the network-engineering team take so that multicast traffic will flow between the enterprise sites over the point-to- multipoint link?
Options
- AImplement RSVP to reserve bandwidth on the link between PE2 and P2
- BImplement PIM-DM to flood multicast traffic from the enterprise into the service provider core
- CImplement MLDP to allow multicast traffic to flow within the single AS
- DImplement SR Tree-SID to build a multicast replication tree over the point-to-multipoint link
Explanation
In an SR-only core you don’t run PIM or MLDP; instead you use a Tree-SID (SRv6 or SR-MPLS) to instantiate the multicast distribution tree. The Tree-SID automatically replicates packets at P2 down each P2→P3 and P2→P4 branch, delivering the enterprise’s multicast streams to all PEs without flooding or additional control-plane protocols.
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