Question 1,334 of 2,152

Device Management →hardMultiple ChoiceObjective-mapped

300-410 Device Management Practice Question

This 300-410 practice question tests your understanding of device management. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.

A VRF-aware network has VRF BLUE on routers R1 and R2. Routes are leaked between VRF BLUE and the global table on R1 using route-replicate. R2 shows: 'show ip route vrf BLUE' includes a route 10.10.10.0/24 learned via OSPF, but 'show ip route' (global) on R1 does not include this route. R1 configuration: ip vrf BLUE, rd 100:1, route-target export 100:1, route-target import 100:1, and 'route-replicate from vrf BLUE to global unicast 10.10.10.0 255.255.255.0'. What is the root cause?

Question 1hardmultiple choice

Review the full OSPF breakdown →

A
The 'route-replicate' command is not configured under the VRF, so it does not take effect; it must be placed under 'ip vrf BLUE'.
The route-replicate command is a subcommand of the VRF configuration; if entered in global configuration mode, it is ignored or causes an error.
B
The OSPF route in VRF BLUE has a tag that prevents it from being leaked.
Why wrong: No tag is mentioned; the route-replicate command does not filter by default.
C
The route 10.10.10.0/24 is not in the VRF BLUE table on R1 because it is learned via R2.
Why wrong: The route is in R2's VRF table, but R1 must have it in its VRF table to leak it; the scenario does not specify if R1 has the route.
D
The route-replicate command requires a route-map to specify the prefix, but none is provided.
Why wrong: The command can use a prefix list or route-map; the example shows a prefix, but the command syntax may be incorrect.

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 'route-replicate' command is not configured under the VRF, so it does not take effect; it must be placed under 'ip vrf BLUE'.

The route-replicate command is used to leak routes from VRF to global table. However, the command syntax requires a route-map or specific prefix to be matched. The configuration shown uses a prefix list implicitly, but the route-replicate command may not be correctly applied under the VRF or may require a route-map. Additionally, the route must be in the VRF table to be replicated. The root cause is that the route-replicate command is misconfigured; it should be under the VRF configuration, not as a standalone command.

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 'route-replicate' command is not configured under the VRF, so it does not take effect; it must be placed under 'ip vrf BLUE'.
Why this is correct
The route-replicate command is a subcommand of the VRF configuration; if entered in global configuration mode, it is ignored or causes an error.
Related concept
OSPF neighbours must agree on key parameters.
✗
The OSPF route in VRF BLUE has a tag that prevents it from being leaked.
Why it's wrong here
No tag is mentioned; the route-replicate command does not filter by default.
✗
The route 10.10.10.0/24 is not in the VRF BLUE table on R1 because it is learned via R2.
Why it's wrong here
The route is in R2's VRF table, but R1 must have it in its VRF table to leak it; the scenario does not specify if R1 has the route.
✗
The route-replicate command requires a route-map to specify the prefix, but none is provided.
Why it's wrong here
The command can use a prefix list or route-map; the example shows a prefix, but the command syntax may be incorrect.

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
No tag is mentioned; the route-replicate command does not filter by default.
Scenario analysis trap
The route is in R2's VRF table, but R1 must have it in its VRF table to leak it; the scenario does not specify if R1 has the route.

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?

Device Management — This question tests Device Management — OSPF neighbours must agree on key parameters..

What is the correct answer to this question?

The correct answer is: The 'route-replicate' command is not configured under the VRF, so it does not take effect; it must be placed under 'ip vrf BLUE'. — The route-replicate command is used to leak routes from VRF to global table. However, the command syntax requires a route-map or specific prefix to be matched. The configuration shown uses a prefix list implicitly, but the route-replicate command may not be correctly applied under the VRF or may require a route-map. Additionally, the route must be in the VRF table to be replicated. The root cause is that the route-replicate command is misconfigured; it should be under the VRF configuration, not as a standalone command.

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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