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300-410 Practice Question: Which TWO configuration steps are required to…
Which TWO configuration steps are required to enable MPLS on a Cisco IOS-XE router using LDP? (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 'mpls ip' on the desired interfaces.
To enable MPLS with LDP, you must configure 'mpls ip' on the interface and also enable a routing protocol (like OSPF or IS-IS) to provide reachability. The 'mpls label protocol ldp' command is optional as LDP is the default, and 'mpls ldp router-id' is optional. 'mpls forwarding-table' is not a configuration command.
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 'mpls ip' on the desired interfaces.
Why this is correct
This command enables MPLS label switching and LDP on the interface.
- ✗
Configure 'mpls label protocol ldp' globally.
Why it's wrong here
LDP is the default label distribution protocol; this command is optional and not strictly required.
- ✓
Configure a routing protocol (e.g., OSPF) to provide IGP reachability between LSRs.
Why this is correct
MPLS requires reachability via an IGP so that LDP can exchange label bindings for routes.
- ✗
Configure 'mpls forwarding-table' to allocate labels.
Why it's wrong here
There is no such configuration command; the forwarding table is built automatically.
- ✗
Configure 'mpls ldp router-id' to set the LDP router ID.
Why it's wrong here
This is optional; the router ID can be learned automatically from the highest loopback IP.
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 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.
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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.