mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Given the following partial configuration: ip cef…
Given the following partial configuration:
ip cef
!
interface Loopback0 ip address 10.0.0.1 255.255.255.255
!
interface GigabitEthernet0/0 ip address 10.1.1.1 255.255.255.252
mpls ip !
router ospf 1 network 10.0.0.1 0.0.0.0 area 0 network 10.1.1.0 0.0.0.3 area 0
! mpls ldp router-id Loopback0 force
What is missing from this configuration to ensure proper MPLS LDP operation?
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
✓
Nothing is missing; the configuration is complete for basic MPLS LDP operation.
The configuration appears correct: CEF enabled, MPLS enabled on the interface, OSPF advertising all networks, and LDP router-id set to a loopback. There is no missing element for basic LDP operation. However, some might think 'mpls label protocol ldp' is needed, but it is default. The question tests if the candidate can identify that nothing 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 'mpls label protocol ldp' command is missing globally or on the interface.
Why it's wrong here
LDP is the default label distribution protocol; explicit configuration is optional.
- ✗
The 'mpls ldp neighbor' command is needed to specify the neighbor's IP address.
Why it's wrong here
LDP dynamically discovers neighbors via hello messages; no static neighbor configuration is required.
- ✓
Nothing is missing; the configuration is complete for basic MPLS LDP operation.
Why this is correct
All required components are present: CEF, interface MPLS enablement, IGP for reachability, and a stable LDP router ID.
- ✗
The 'mpls ip' command must also be applied under the OSPF process.
Why it's wrong here
MPLS is enabled on interfaces, not under the routing protocol. OSPF does not require an MPLS subcommand.
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
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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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.