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300-410 Practice Question: A VRF-aware network has VRF BLUE on routers R1…
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?
⚠ Common exam trap
Cisco often tests the exact placement of VRF-related commands, and the trap here is that candidates assume 'route-replicate' is a global command like 'router ospf', when in fact it must be nested under the VRF configuration.
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 must be configured under the VRF configuration mode (i.e., 'ip vrf BLUE') to take effect. In the given scenario, it was likely applied in global configuration mode, which is incorrect. Without proper placement, the route replication does not occur, so the 10.10.10.0/24 route remains only in the VRF BLUE table on R1 and is not copied to the global routing table.
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.
- ✗
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.
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
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.