Question 1,999 of 2,152

VRF-Lite →hardMultiple SelectObjective-mapped

Quick Answer

The correct answer is that the 'network' command under the OSPF process can be used to enable OSPF on interfaces belonging to the VRF, and the OSPF process is VRF-specific. In VRF-Lite, you configure a separate OSPF process per VRF using the `router ospf <process-id> vrf <name>` command, which makes the process entirely VRF-aware and automatically uses the VRF’s routing table rather than the global table. The classic `network` statement still works to match interfaces within that VRF, so you do not need to redistribute connected routes or rely on BGP for OSPF to function. On the Cisco CCNP ENARSI 300-410 exam, this topic tests your understanding that VRF-Lite does not change OSPF’s fundamental behavior—it simply scopes the process to a VRF. A common trap is assuming OSPF requires redistribution or BGP in VRF-Lite, but it does not; the `network` command remains valid and directly enables OSPF on the VRF’s interfaces. Memory tip: think “VRF-Lite OSPF = same OSPF, just in a private routing table—network commands still work, no extra redistribution needed.”

300-410 VRF-Lite Practice Question

This 300-410 practice question tests your understanding of vrf-lite. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

Which TWO statements correctly describe the behavior of VRF-Lite when using OSPF as the IGP? (Choose TWO.)

Question 1hardmulti select

Review the full OSPF breakdown →

A
The OSPF process must be configured with the 'vrf <name>' keyword to associate it with a specific VRF.
Correct. The command 'router ospf <pid> vrf <name>' creates a VRF-aware OSPF instance.
B
OSPF in VRF-Lite requires an MP-BGP session to exchange routes between VRFs.
Why wrong: 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.
C
By default, OSPF automatically redistributes all connected routes in the VRF into OSPF.
Why wrong: Incorrect. OSPF does not automatically redistribute connected routes; the 'redistribute connected' command is required.
D
The 'network' command under the OSPF process can be used to enable OSPF on interfaces belonging to the VRF.
Correct. The 'network' command is still valid and matches interfaces in the VRF.
E
OSPF in VRF-Lite uses different LSA types compared to global OSPF.
Why wrong: Incorrect. OSPF LSA types (Type 1-7) are the same; VRF-Lite does not change OSPF protocol mechanics.

Full breakdown with real-world context →

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.

Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

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.
Related concept
OSPF neighbours must agree on key parameters.
✗
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.
Related concept
OSPF neighbours must agree on key parameters.
✗
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.

Common exam traps

Common exam trap: OSPF can fail even when IP connectivity looks correct

OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.

Trap categories for this question

Command / output trap
Incorrect. OSPF does not automatically redistribute connected routes; the 'redistribute connected' command is required.

Detailed technical explanation

How to think about this question

OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.

KKey Concepts to Remember

OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.

TExam Day Tips

Check area mismatch first when OSPF adjacency fails.
Review passive interfaces when a network is advertised but no neighbour forms.
Use show ip ospf neighbor and show ip route clues carefully.

Key takeaway

OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

Real-world example

How this comes up in practice

A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.

What to study next

Got this wrong? Here's your next step.

Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.

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FAQ

Questions learners often ask

What does this 300-410 question test?

VRF-Lite — This question tests VRF-Lite — OSPF neighbours must agree on key parameters..

What is the correct answer to this question?

The correct answer is: 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.

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

OSPF neighbours must agree on key parameters.

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