Which statement correctly describes the role of a LISP map resolver?
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Correct answer: to decapsulate map-request messages from ITRs and forward the messages to the MS.
Why this is the answer
The LISP Map Resolver (MR) is a crucial component in the LISP architecture. Its primary function is to receive map-request messages from Ingress Tunnel Routers (ITRs) when an ITR needs to find the RLOC for a destination EID. The MR then decapsulates these requests and forwards them to the appropriate Map Server (MS) that is authoritative for the requested EID. The MS, in turn, holds the EID-to-RLOC mappings and will respond to the ITR, either directly or via the MR. Incorrect options: The first option describes the role of a LISP xTR (specifically an ETR for publishing mappings and an ITR for responding to map-requests, but the overall description is for an xTR). The second and third options describe functions related to LISP NAT traversal or proxy ETR/ITR functionalities, which are not the core role of a Map Resolver.
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