350-501 MPLS and Segment Routing Practice Question
Which label distribution mode does LDP use by default in Cisco IOS?
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
✓
Downstream unsolicited
LDP uses downstream unsolicited mode by default, where a router advertises labels to all neighbors without being asked.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Downstream on-demand
Why it's wrong here
That is used in RSVP, not LDP default.
- ✗
Upstream unsolicited
Why it's wrong here
Not a standard LDP mode.
- ✓
Downstream unsolicited
Why this is correct
Correct: LDP default is downstream unsolicited.
- ✗
Upstream on-demand
Why it's wrong here
Not a standard LDP mode.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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