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300-415 · Question #434
300-415 Question #434: Real Exam Question with Answer & Explanation
The correct answer is D: Eliminate packet replication on the ingress router that is connected to multicast source.. In SD-WAN overlay multicast, optimization is achieved by eliminating redundant packet replication at the ingress (source-connected) WAN Edge, pushing efficient per-receiver replication toward egress nodes.
WAN Edge Router Deployment
Question
How should an engineer optimize multicast packet distribution throughout the overlay network in SD-WAN?
Options
- AEliminate packet replication on the WAN Edge router that is connected to multicast source.
- BBuild a shared tree such that a WAN Edge router learns the IP address for the multicast source.
- CBuild a shared tree such that a last-hop router learns the IP address for the multicast source.
- DEliminate packet replication on the ingress router that is connected to multicast source.
Explanation
In SD-WAN overlay multicast, optimization is achieved by eliminating redundant packet replication at the ingress (source-connected) WAN Edge, pushing efficient per-receiver replication toward egress nodes.
Common mistakes.
- A. This choice describes removing replication from the WAN Edge connected to the source, which is the same concept as D but uses imprecise terminology - the key optimization target is the 'ingress router,' not just any WAN Edge.
- B. Building a shared tree where a WAN Edge learns the multicast source IP describes traditional PIM RP shared-tree behavior, not the SD-WAN overlay optimization mechanism.
- C. Building a shared tree where a last-hop router learns the source IP describes PIM SPT switchover, which is a native IP multicast concept unrelated to SD-WAN overlay multicast optimization.
Concept tested. SD-WAN overlay multicast replication optimization
Topics
#SD-WAN Multicast#Multicast Optimization#WAN Edge Router#Packet Replication
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