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300-410 Practice Question: Which TWO statements correctly describe the…
Which TWO statements correctly describe the behavior of VRF-Lite when using OSPF as the IGP? (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
✓
The OSPF process must be configured with the 'vrf <name>' keyword to associate it with a specific VRF.
In VRF-Lite, OSPF can be configured per VRF, and the OSPF process uses the VRF's routing table. The 'router ospf <process-id> vrf <name>' command creates a VRF-aware OSPF process. By default, OSPF uses the VRF's route table, not the global table. The 'network' statement under the OSPF process is still used to enable OSPF on interfaces, but the interface must be in the same VRF. Option A is correct because the OSPF process is VRF-specific. Option D is correct because the 'network' command is still valid. Option B is incorrect because OSPF does not require BGP; it can run directly. Option C is incorrect because OSPF does not automatically redistribute connected routes; a redistribution command is needed. Option E is incorrect because OSPF LSA types are the same in VRF-Lite.
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 process must be configured with the 'vrf <name>' keyword to associate it with a specific VRF.
Why this is correct
Correct. The command 'router ospf <pid> vrf <name>' creates a VRF-aware OSPF instance.
- ✗
OSPF in VRF-Lite requires an MP-BGP session to exchange routes between VRFs.
Why it's wrong here
Incorrect. VRF-Lite uses only Layer 3 interfaces within the same device; no MP-BGP is required. MP-BGP is used in MPLS VPN environments.
- ✗
By default, OSPF automatically redistributes all connected routes in the VRF into OSPF.
Why it's wrong here
Incorrect. OSPF does not automatically redistribute connected routes; the 'redistribute connected' command is required.
- ✓
The 'network' command under the OSPF process can be used to enable OSPF on interfaces belonging to the VRF.
Why this is correct
Correct. The 'network' command is still valid and matches interfaces in the VRF.
- ✗
OSPF in VRF-Lite uses different LSA types compared to global OSPF.
Why it's wrong here
Incorrect. OSPF LSA types (Type 1-7) are the same; VRF-Lite does not change OSPF protocol mechanics.
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
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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