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300-410 Practice Question: In MPLS L3VPN, which LSA type is used by OSPF to…
In MPLS L3VPN, which LSA type is used by OSPF to advertise prefix information from a PE router into a customer VRF instance?
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
✓
Type 3 (Summary LSA)
When OSPF is used as the PE-CE protocol, the PE router redistributes VPN routes into OSPF as Type 3 LSAs (Summary LSAs) by default, unless the 'capability vrf-lite' command is configured.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Type 1 (Router LSA)
Why it's wrong here
Type 1 LSAs advertise router links within an area, not redistributed VPN routes.
- ✗
Type 2 (Network LSA)
Why it's wrong here
Type 2 LSAs describe multi-access networks, not redistributed routes.
- ✓
Type 3 (Summary LSA)
Why this is correct
Correct. PE routers inject VPN routes as Type 3 LSAs into the customer OSPF domain.
- ✗
Type 5 (External LSA)
Why it's wrong here
Type 5 LSAs are used for external routes, but in MPLS L3VPN, Type 3 is the default.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
Go deeper
Related to this question
Learn chapter
OSPF Neighbor Adjacency and Basics
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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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.