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300-410 Practice Question: In an MPLS network, OSPF network type mismatch…
In an MPLS network, OSPF network type mismatch causes routing issues. Router R1 and R2 are connected via a multi-access Ethernet link. R1 has 'interface GigabitEthernet0/0 ip ospf network point-to-point', while R2 has default OSPF network type broadcast. R1 shows 'show ip ospf neighbor' output: 'Neighbor 10.0.0.2, interface address 10.0.0.2, state FULL' but 'show ip route' does not include routes from R2. 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 OSPF network type mismatch causes R1 to ignore Type 2 LSAs from R2, preventing route installation.
OSPF network type mismatch on a multi-access link can cause adjacency to form but with different DR/BDR election behavior. With point-to-point on R1, it expects no DR/BDR, while broadcast on R2 expects DR election. The adjacency forms as FULL, but R1 does not accept routes from R2 because R2's LSA may have a different link type or R1 ignores them due to mismatch in network type handling.
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 OSPF network type mismatch causes R1 to ignore Type 2 LSAs from R2, preventing route installation.
Why this is correct
Point-to-point network type does not process Type 2 (network) LSAs, so routes advertised by R2 via network LSA are ignored.
- ✗
The MTU mismatch between R1 and R2 causes OSPF database synchronization failure.
Why it's wrong here
Adjacency is FULL, so database sync is complete.
- ✗
R1 has a distribute-list blocking routes from R2.
Why it's wrong here
No distribute-list mentioned.
- ✗
R2 is not advertising any routes; need 'network' statement.
Why it's wrong here
Routes are expected to be advertised.
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
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.
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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.