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Exam 350-401 topic 1 question 596 discussion

Actual exam question from Cisco's 350-401
Question #: 596
Topic #: 1
[All 350-401 Questions]

What is the function of the LISP map resolver?

  • A. to connect a site to the LISP-capable part of a core network publish the EID-to-RLOC mappings for the site, and respond to map-request messages
  • B. to advertise routable non-LISP traffic from one address family to LISP sites in a different address family
  • C. to send traffic to non-LISP sites when connected to a service provider that does not accept nonroutable EIDs as packet sources
  • D. to decapsulate map-request messages from ITRs and forward the messages to the MS
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Suggested Answer: D 🗳️
by Tacolicious at Nov. 18, 2022, 4:58 p.m.

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Tacolicious
Highly Voted 1 year, 6 months ago
Selected Answer: D
Like an MS, a LISP MR connects to the ALT. The function of the LISP MR is to accept encapsulated Map-Request messages from ingress tunnel routers (ITRs), decapsulate those messages, and then forward the messages to the MS responsible for the egress tunnel routers (ETRs) that are authoritative for the requested EIDs. When an MR is implemented concurrently with an MS in a private mapping system deployment, the concurrent MS forwards the encapsulated Map-Request messages to the authoritative ETRs. When a LISP ALT is present in the deployment, the MR forwards the Map-Request messages directly over the ALT to the MS responsible for the ETRs that are authoritative for the requested EIDs. An MR also sends Negative Map-Replies to ITRs in response to queries for non-LISP addresses. source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_lisp/configuration/xe-3s/irl-xe-3s-book/irl-overview.html#GUID-89BB8D34-63BF-43DE-8743-5572D357CDB3
upvoted 6 times
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[Removed]
Most Recent 2 weeks, 3 days ago
Selected Answer: D
D is correct
upvoted 1 times
[Removed]
6 days, 2 hours ago
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_lisp/configuration/xe-3s/irl-xe-3s-book/irl-overview.html#:~:text=The%20function%20of%20the%20LISP%20MR%20is%20to%20accept%20encapsulated%20Map%2DRequest%20messages%20from%20ingress%20tunnel%20routers%20(ITRs)%2C%20decapsulate%20those%20messages%2C%20and%20then%20forward%20the%20messages%20to%20the%20MS%20responsible%20for%20the%20egress%20tunnel%20routers%20(ETRs)%20that%20are%20authoritative%20for%20the%20requested%20EIDs.
upvoted 1 times
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