hardMultiple SelectObjective-mapped
300-410 Practice Question: Which TWO statements about the use of 'mpls ldp…
Which TWO statements about the use of 'mpls ldp autoconfig' in an MPLS L3VPN environment are true? (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
✓
It automatically enables LDP on all interfaces that are part of the OSPF or IS-IS process.
The 'mpls ldp autoconfig' command is used under an OSPF or IS-IS process to automatically enable LDP on all interfaces participating in that IGP. It simplifies configuration but can be overridden per interface. It does not affect BGP sessions, nor does it enable LDP on loopback interfaces by default (loopbacks are not typically used for LDP label exchange). It does not enable MPLS on core interfaces automatically if they are not part of the IGP process.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It automatically enables LDP on all interfaces that are part of the OSPF or IS-IS process.
Why this is correct
Correct. The command enables LDP on all interfaces running the IGP, reducing manual configuration.
- ✓
It can be overridden on a specific interface by configuring 'no mpls ip' under that interface.
Why this is correct
Correct. The per-interface 'mpls ip' command takes precedence; 'no mpls ip' disables LDP on that interface even with autoconfig.
- ✗
It automatically enables LDP on loopback interfaces to facilitate BGP next-hop reachability.
Why it's wrong here
Incorrect. Loopback interfaces are not enabled by default; they are not typically used for LDP label exchange.
- ✗
It configures LDP on all interfaces, including those not running the IGP, as long as they are IP-enabled.
Why it's wrong here
Incorrect. The command only applies to interfaces participating in the IGP process under which it is configured.
- ✗
It is required for the PE-CE routing protocol to exchange labels with the CE router.
Why it's wrong here
Incorrect. PE-CE routing protocols do not use LDP; labels are assigned via BGP or static configuration.
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
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.
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
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