hardMultiple ChoiceObjective-mapped
300-410 Practice Question: A service provider network is experiencing MPLS…
A service provider network is experiencing MPLS label distribution failures between R1 and R2. R1 has: event manager applet LDP-MONITOR event syslog pattern "%LDP-4-ERROR" action 1.0 cli command "enable" action 2.0 cli command "clear mpls ldp neighbor *" action 3.0 syslog msg "Cleared LDP neighbors". Router R2 shows: LDP session is down, and logs show repeated LDP errors. What is the root cause?
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
✓
The EEM applet clears all LDP neighbors upon any LDP error, preventing the session from stabilizing.
The EEM applet triggers on any LDP error and clears all LDP neighbors. This removes the LDP session, causing more errors when the session tries to re-establish, leading to a cycle of failures. The correct fix is to clear only the affected neighbor or address the underlying LDP issue.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The EEM applet clears all LDP neighbors upon any LDP error, preventing the session from stabilizing.
Why this is correct
Clearing all LDP neighbors disrupts all LDP sessions, causing repeated errors.
- ✗
The LDP router-id is misconfigured on R1.
Why it's wrong here
No router-id configuration is shown; the issue is the EEM clear command.
- ✗
The syslog pattern matches only severity 4, but LDP errors are severity 3.
Why it's wrong here
The pattern matches any LDP error; severity is not filtered.
- ✗
The MPLS label range is exhausted on R1.
Why it's wrong here
No evidence of label exhaustion; the problem is the EEM applet.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
LDP Protocol
LDP, or Label Distribution Protocol, is a protocol that routers use to automatically exchange labels that enable MPLS (Multiprotocol Label Switching) to create fast, efficient paths for data packets across a network.
Key term
MPLS Label Distribution
MPLS Label Distribution is the process by which routers exchange labels that tell them how to forward packets across a network without looking at the IP address each time.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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