- A
The PE will successfully exchange VPNv4 routes with the remote PE and redistribute routes from CE into VPNv4.
All necessary components are present: VRF with RT, iBGP VPNv4 session with extended community, and eBGP to CE under VRF.
- B
The eBGP session will fail because the neighbor is not activated under the global BGP process.
Why wrong: For VRF peers, activation is done under the VRF address-family, not globally.
- C
The VPNv4 session will fail because the neighbor is not configured as a route-reflector client.
Why wrong: Route-reflector is not required for a simple iBGP session; it is only needed if the PE is a route-reflector.
- D
The VRF will not import routes because the import and export RTs are the same.
Why wrong: Having the same RT for import and export is common in many topologies.
Quick Answer
The answer is that the PE will successfully exchange VPNv4 routes with the remote PE and redistribute routes from the CE into VPNv4. This configuration is correct because the VRF CUSTOMER-D is properly defined with a Route Distinguisher and matching import/export Route Targets, the GigabitEthernet0/4 interface is bound to that VRF, and the BGP process establishes both an iBGP VPNv4 session to the remote PE (with extended community exchange enabled) and an eBGP session to the CE under the VRF address-family. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of the complete MPLS L3VPN configuration verification workflow, where a common trap is forgetting to enable the send-community extended command under the VPNv4 neighbor, which would prevent VPNv4 route propagation. Remember the verification checklist: VRF with RD/RT, interface under VRF, iBGP VPNv4 with extended communities, and eBGP under the VRF address-family. A useful memory tip is "VRF, Interface, VPNv4, VRF-eBGP" — if any piece is missing, the L3VPN fails.
300-410 MPLS L3VPN Practice Question
This 300-410 practice question tests your understanding of mpls l3vpn. 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.
A PE router has the following configuration:
ip vrf CUSTOMER-D
rd 300:1 route-target export 300:1 route-target import 300:1 !
interface GigabitEthernet0/4 ip vrf forwarding CUSTOMER-D ip address 10.3.3.1 255.255.255.252
!
router bgp 65000 neighbor 10.0.0.1 remote-as 65000 neighbor 10.0.0.1 update-source Loopback0
! address-family vpnv4
neighbor 10.0.0.1 activate neighbor 10.0.0.1 send-community extended
exit-address-family ! address-family ipv4 vrf CUSTOMER-D
neighbor 10.3.3.2 remote-as 65002 neighbor 10.3.3.2 activate
exit-address-family
What is the effect of 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 PE will successfully exchange VPNv4 routes with the remote PE and redistribute routes from CE into VPNv4.
The configuration is correct. The VRF has RD and RTs, the interface is in the VRF, the iBGP VPNv4 session is configured with extended community, and the eBGP session to the CE is configured under the VRF address-family. The PE will exchange VPNv4 routes with the remote PE and redistribute CE routes.
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 PE will successfully exchange VPNv4 routes with the remote PE and redistribute routes from CE into VPNv4.
- ✗
The eBGP session will fail because the neighbor is not activated under the global BGP process.
Why it's wrong here
For VRF peers, activation is done under the VRF address-family, not globally.
- ✗
The VPNv4 session will fail because the neighbor is not configured as a route-reflector client.
Why it's wrong here
Route-reflector is not required for a simple iBGP session; it is only needed if the PE is a route-reflector.
- ✗
The VRF will not import routes because the import and export RTs are the same.
Why it's wrong here
Having the same RT for import and export is common in many topologies.
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.
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?
MPLS L3VPN — This question tests MPLS L3VPN — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The PE will successfully exchange VPNv4 routes with the remote PE and redistribute routes from CE into VPNv4. — The configuration is correct. The VRF has RD and RTs, the interface is in the VRF, the iBGP VPNv4 session is configured with extended community, and the eBGP session to the CE is configured under the VRF address-family. The PE will exchange VPNv4 routes with the remote PE and redistribute CE routes.
What should I do if I get this 300-410 question wrong?
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.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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