Which function does a LISP Ingress Tunnel Router (ITR) perform?
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Correct answer: finding EID-to-RLOC mappings.
Why this is the answer
An Ingress Tunnel Router (ITR) in LISP (Locator/ID Separation Protocol) is responsible for finding the EID-to-RLOC (Endpoint ID to Routing Locator) mappings for destination EIDs. When an ITR receives a packet for a destination EID, it queries the LISP mapping system (Map-Server/Map-Resolver) to determine the corresponding RLOC. Once the mapping is found, the ITR encapsulates the packet and forwards it towards the destination RLOC. "Responding to map-request messages" is a function of a Map-Server or Egress Tunnel Router (ETR). "Forwarding user data traffic" is a general function of any router, but the ITR's specific LISP function is mapping lookup. "Accepting registration requests from ETRs" is a function of a Map-Server.
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