350-501 Networking Practice Question
Which LISP feature allows a device to register its location to a mapping system so that another device can find it?
⚠ Common exam trap
Cisco often tests the distinction between the ETR (which registers) and the xTR (which is a device that can act as both ITR and ETR), leading candidates to incorrectly select xTR because they think it covers both functions, but the question specifically asks for the device that registers its location.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ETR
The Egress Tunnel Router (ETR) is the LISP device that registers its location (RLOC) to the mapping system (Map-Server) so that other devices can resolve the endpoint identifier (EID) to that RLOC. This registration process populates the mapping database, enabling remote Ingress Tunnel Routers (ITRs) to find and forward traffic to the ETR. Without ETR registration, the mapping system would have no location information for the EID.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
ETR
Why this is correct
ETR registers EID-to-RLOC mappings with the mapping system.
- ✗
Map-Resolver (MR)
Why it's wrong here
MR resolves mappings on behalf of ITRs.
- ✗
Proxy ITR (PITR)
Why it's wrong here
PITR acts as ITR for non-LISP sites.
- ✗
xTR
Why it's wrong here
xTR is a combination of ITR and ETR.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.