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Answer :
In the context of Segment Routing (SR) and Label Distribution Protocol (LDP), packets can either be sourced from or destined to these technologies depending on the network setup and protocols involved.
Segment Routing is a modern type of source routing protocol. It allows for more flexible packet routing within a network, where the source node defines the path that packets should take through the network nodes using segments. LDP, on the other hand, is a protocol used to establish MPLS LSPs (Label Switched Paths) by mapping network layer routing information directly to data link layer-switched paths.
The SR mapping server entry is typically used to facilitate interoperability between SR and LDP domains.
Here's a breakdown of the options given:
Sourced in SR, destined to LDP: This would mean packets are sourced using Segment Routing, but are ultimately headed to a destination that uses LDP's label-switched paths.
Sourced in LDP, destined in LDP: The packets are sourced and routed entirely using LDP.
Sourced in SR, destined to SR: Both originating and terminating on SR, fully leveraging Segment Routing's capabilities.
Sourced in LDP, destined to SR: The packets begin in an LDP environment but are intended to reach a final SR-based destination.
Sourced in LDP, going over SR, destined to LDP: Usage of both technologies in segments of the path, likely involving a transition from LDP to SR and back to LDP.
The SR mapping server entry would be crucial when packets need to traverse or transition between domains or technologies — particularly when both SR and LDP interact or coexist in the network topology. Therefore, the correct option here is Option 4: Sourced in LDP, destined to SR. This setup requires reference to the SR mapping server as it involves interoperability and transitioning from LDP to SR.
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