mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Examine the following configuration on a PE…
Examine the following configuration on a PE router:
ip vrf CUSTOMER-C
rd 200:1 !
interface GigabitEthernet0/3 ip vrf forwarding CUSTOMER-C ip address 10.2.2.1 255.255.255.252
!
router ospf 1 vrf CUSTOMER-C network 10.2.2.0 0.0.0.3 area 0
!
router bgp 65000
address-family ipv4 vrf CUSTOMER-C redistribute ospf 1 exit-address-family
What is missing from this 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 VRF is missing route-target export and import commands.
The VRF is missing route-target import and export commands. Without route-targets, the VPNv4 routes will not be tagged with an RT, and the remote PE will not know which VRF to import them into. Also, the OSPF process is configured under the VRF, and redistribution is done, but the RT is missing.
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 VRF is missing route-target export and import commands.
Why this is correct
Route-targets are required for MPLS L3VPN to control the distribution of VPNv4 routes between PEs. Without them, the routes are not properly tagged.
- ✗
The OSPF network command should use a wildcard mask of 0.0.0.0.
Why it's wrong here
The wildcard mask 0.0.0.3 is correct for a /30 network.
- ✗
The BGP neighbor must be configured under the VRF address-family.
Why it's wrong here
For OSPF redistribution, you do not need a BGP neighbor under the VRF; the redistribution is sufficient to inject routes into BGP.
- ✗
The VRF must have a route distinguisher that matches the route-target.
Why it's wrong here
RD and RT are independent; they do not need to match.
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.
Key term
MP-BGP for VPN
MP-BGP for VPN is an extension of the Border Gateway Protocol that carries multiple types of network layer information to enable scalable, isolated virtual private networks over a shared provider infrastructure.
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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.