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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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Last reviewed: Jun 18, 2026
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