ITR:
1. ITR sends a map request to the Map Resolver (MR) and processes the reply to resolve the EID-RLOC (Routing Locator) mapping.
2. Encapsulating packets to send to remote LISP sites
3. Forwarding packets to non-LISP sites
The Ingress Tunnel Router (ITR) is responsible for sending map requests and processing received map replies to resolve EID-to-RLOC mappings. Additionally, on the data plane side, the ITR encapsulates packets for transmission to remote LISP sites or natively forwards packets to non-LISP sites.
A. Map Resolver receives the Map Request messages and forwards them to the ETR. The ETR replies to them
B. Basically all routers do this.
C. ITR
D. There is no such LISP message as a "registration request". The message is called "Map Register" message, it is sent by the ETR and processed by the Map Server
Given answer is correct.
LISP Ingress Tunnel Router (ITR)
An ITR is responsible for finding EID-to-RLOC mappings for all traffic destined for LISP-capable sites. When the ITR receives a packet destined for an EID, it first looks for the EID in its mapping cache. If the ITR finds a match, it encapsulates the packet inside a LISP header with one of its RLOCs as the IP source address
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_lisp/configuration/15-mt/irl-15-mt-book/irl-overview.pdf
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