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300-410 Practice Question: Which MPLS label is used for the Router Alert…
Which MPLS label is used for the Router Alert function, and what is its purpose?
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
✓
Label 1; used to alert the router to examine the packet in the control plane.
Label 1 is the Router Alert label, used to indicate that the packet should be examined by the router's control plane, typically for OAM or RSVP-TE messages.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Label 1; used to alert the router to examine the packet in the control plane.
Why this is correct
Label 1 is the Router Alert label per RFC 3032.
- ✗
Label 0; used to alert the router to examine the packet.
Why it's wrong here
Label 0 is the Explicit NULL label, not Router Alert.
- ✗
Label 2; used to alert the router to examine the packet.
Why it's wrong here
Label 2 is the IPv6 Explicit NULL label.
- ✗
Label 3; used to alert the router to examine the packet.
Why it's wrong here
Label 3 is the Implicit NULL label.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.