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300-410 Practice Question: Which TWO configuration steps are required to…
Which TWO configuration steps are required to enable MPLS L3VPN on a new PE router? (Choose TWO.)
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
✓
Configure VRF with route distinguisher and route target.
To enable MPLS L3VPN, you must configure VRF definitions with RD and RT, and then associate the VRF with customer-facing interfaces. Enabling LDP on the core-facing interfaces is also required for label distribution. Configuring OSPF on the core is an underlay step, not specific to VPN. Enabling CEF is a prerequisite for MPLS but is often already enabled. Configuring MP-BGP on the PE is necessary but the question asks for steps on the PE; MP-BGP configuration is a separate step but not listed as an option here; the two correct options are the most direct VRF and interface steps.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure VRF with route distinguisher and route target.
Why this is correct
VRF definition with RD/RT is essential for VPN route separation.
- ✓
Associate the VRF with the customer-facing interface using 'ip vrf forwarding <name>'.
Why this is correct
Binds the VRF to the interface, enabling VRF-aware routing.
- ✗
Enable OSPF on all core-facing interfaces.
Why it's wrong here
OSPF is an IGP option for the underlay, not a VPN-specific requirement.
- ✗
Enable CEF globally.
Why it's wrong here
CEF is required for MPLS but is typically already enabled; not a VPN-specific configuration step.
- ✗
Configure an MPLS TE tunnel between PEs.
Why it's wrong here
MPLS TE is optional and not required for basic L3VPN.
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
OSPF Neighbor Adjacency and Basics
Key term
MPLS Label Distribution
MPLS Label Distribution is the process by which routers exchange labels that tell them how to forward packets across a network without looking at the IP address each time.
Key term
LDP Protocol
LDP, or Label Distribution Protocol, is a protocol that routers use to automatically exchange labels that enable MPLS (Multiprotocol Label Switching) to create fast, efficient paths for data packets across a network.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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