Given answer is correct!
When MS and MR function runs on separate devices:
1. ITR --'map-request'--> MAP-Resolver (MR)
2. MR --- forwards 'map-request' -----> MAP-Server (MS)
3. MS --- check DB for RLOC -- finds (ETR)
4. MS -- Sends 'map-request' to ------> Egress Tunnel Router (ETR)
5. ETR -- sends 'MAP-Reply' directly to ----->ITR
When MS and MR function runs on same devices (which is this question):
1. ITR --'map-request'--> MAP-Resolver (MR/MS)
2. MS --- check DB for RLOC -- find (ETR)
3. MS -- Sends 'map-request' to ------> Egress Tunnel Router (ETR)
4. ETR -- sends 'MAP-Reply' directly to ----->ITR
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_lisp/configuration/15-mt/irl-15-mt-book/irl-overview.pdf
It's confusing. Because either way MR gets requests, but MS finds ETR and the question asks for both functions at the same time. So which one?
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