mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Examine the following partial MPLS configuration…
Examine the following partial MPLS configuration on a Cisco IOS-XE router:
interface GigabitEthernet0/0 ip address 10.0.1.1 255.255.255.252
mpls ip mpls label protocol ldp !
router ospf 1 network 10.0.1.0 0.0.0.3 area 0
! mpls ldp router-id Loopback0 force
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
✓
LDP will establish a session with the neighbor on GigabitEthernet0/0, using Loopback0 as the transport address.
The configuration enables LDP on the interface and globally via 'mpls ip'. The 'mpls label protocol ldp' is default but explicit. The 'mpls ldp router-id Loopback0 force' ensures LDP uses Loopback0 as the router ID, overriding any other interface. OSPF advertises the /30 link. This is a correct minimal MPLS configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
LDP will establish a session with the neighbor on GigabitEthernet0/0, using Loopback0 as the transport address.
Why this is correct
The 'mpls ldp router-id Loopback0 force' command forces LDP to use Loopback0 as the router ID, which becomes the transport address for LDP sessions. The 'mpls ip' on the interface enables label switching and LDP hello messages.
- ✗
LDP will use the IP address of GigabitEthernet0/0 as the router ID because 'force' is not valid.
Why it's wrong here
The 'force' keyword is valid and overrides the default selection of the highest IP address. Without 'force', LDP might choose a different router ID if a higher IP appears later.
- ✗
LDP sessions will fail because OSPF is not redistributed into LDP.
Why it's wrong here
LDP does not require redistribution of routing protocols; it uses the IGP routing table to establish label bindings for FECs. OSPF is sufficient for reachability.
- ✗
MPLS forwarding will not occur because 'mpls label protocol ldp' is redundant and causes a conflict.
Why it's wrong here
The command is optional and does not cause conflict; it simply specifies the label distribution protocol. MPLS forwarding will work normally.
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
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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