350-501 MPLS and Segment Routing Practice Question
Which two statements about LDP liberal label retention are true? (Choose two.)
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
✓
It allows faster convergence after a topology change.
Liberal label retention is the default mode in Cisco IOS and does not require explicit configuration; it retains all labels even if not used (D) and speeds convergence because labels are already available after a topology change (B). Option C describes conservative retention, and option E is false because liberal retention is default and does not require manual filtering.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It requires explicit configuration of the label retention mode in Cisco IOS.
Why it's wrong here
Liberal is default, but this is true, but the question asks for two true statements. Actually liberal is default, but we need two correct. So A and C are correct. D is also correct? Wait, check: In Cisco IOS, liberal label retention is default. So D is also true. But the question says choose two. Let's verify: Actually, Cisco IOS uses liberal label retention by default. So both A, C, and D are true? The question says 'which two statements are true?' and we need to select two. Let's adjust distractors. I'll make D incorrect by changing text to 'It is the default mode for LDP in Juniper.' No, stick to Cisco. I'll make D say 'It is the default mode for LDP in Cisco IOS' which is true. So three true statements? I need to ensure only two correct. I'll modify D to say 'It requires manual configuration of label filtering' which is false. That works.
- ✓
It allows faster convergence after a topology change.
Why this is correct
Correct: Labels are already available.
- ✗
It conserves memory by only storing labels for next-hop neighbors.
Why it's wrong here
That describes conservative retention.
- ✓
It retains labels from all neighbors regardless of whether they are used for forwarding.
Why this is correct
Correct: Liberal retention keeps all labels.
- ✗
It requires manual configuration of label filtering.
Why it's wrong here
Liberal retention does not require filtering.
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