300-410 Infrastructure Services Practice Question
A network engineer is configuring a Cisco IOS XE router as a LISP ITR. The router must encapsulate traffic from local EIDs to remote RLOCs. Which command is required to enable LISP functionality and allow the router to act as an ITR?
⚠ Common exam trap
Many candidates confuse the IOS XE command with NX-OS feature commands or assuming that the ITR enable command can be issued globally, when the correct entry point is the router lisp submode.
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
✓
router lisp
On Cisco IOS XE, LISP is enabled by entering the router lisp global configuration command. This mode allows you to configure the router as an ITR, ETR, or both, and to define EID-to-RLOC mappings and map-resolvers. The other commands are either invalid in this context or belong to different platforms, so they would not enable LISP functionality.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
router lisp
Why this is correct
The router lisp command enters LISP configuration mode, where you can enable ITR functionality, define EID-to-RLOC database mappings, and configure map-resolvers. Without this global command, LISP processes are not activated, and the router cannot encapsulate or decapsulate LISP traffic. It is the foundational step for any LISP role.
- ✗
lisp itr enable
Why it's wrong here
While lisp itr enable is a valid command within LISP configuration mode, it cannot be issued in global configuration mode. It requires the router lisp command first to enter the correct submode. Without entering that mode, the command is not available, and the ITR function is not activated.
- ✗
feature lisp
Why it's wrong here
The feature lisp command is used on Cisco Nexus platforms with NX-OS, not on Cisco IOS XE. On IOS XE, LISP is enabled by entering router lisp configuration mode. Using this command on IOS XE would be rejected, and LISP would not be operational.
- ✗
ipv4 lisp
Why it's wrong here
There is no global ipv4 lisp command on Cisco IOS XE for enabling LISP. LISP is configured under the router lisp submode, where address-family-specific settings are applied. Issuing this command would result in an unrecognized command error, and LISP would remain disabled.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
This 300-410 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 300-410 exam.