mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot an…
A network engineer runs the following command to troubleshoot an MPLS L3VPN issue:
R1# debug ip bgp updates
Output:
*Mar 1 00:01:23.456: BGP(0): 10.0.0.2 UPDATE out w/ attr: nexthop 10.0.0.1, origin i, metric 0, path 65000, extended community RT:100:100 *Mar 1 00:01:23.456: BGP(0): 10.0.0.2 UPDATE out for 10.1.1.0/24 *Mar 1 00:01:23.456: BGP(0): 10.0.0.2 UPDATE run, update group 1
What does this output indicate?
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
✓
R1 is advertising prefix 10.1.1.0/24 to BGP peer 10.0.0.2
The debug ip bgp updates output shows that router R1 is sending a BGP update to neighbor 10.0.0.2 for prefix 10.1.1.0/24. The attributes include next hop 10.0.0.1, origin IGP, metric 0, AS path 65000, and extended community RT:100:100. This indicates a VPNv4 update is being advertised.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
R1 is advertising prefix 10.1.1.0/24 to BGP peer 10.0.0.2
Why this is correct
The output clearly shows an UPDATE out for 10.1.1.0/24 to 10.0.0.2.
- ✗
R1 is receiving an update for 10.1.1.0/24 from 10.0.0.2
Why it's wrong here
The output says 'UPDATE out', meaning it is being sent, not received.
- ✗
R1 is withdrawing prefix 10.1.1.0/24
Why it's wrong here
No withdrawal indication; it's an update with attributes.
- ✗
R1 is using OSPF to advertise the prefix
Why it's wrong here
The debug is for BGP updates, not OSPF.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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