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MPLS Operations →mediumMultiple ChoiceObjective-mapped

300-410 MPLS Operations Practice Question

This 300-410 practice question tests your understanding of mpls operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

Consider the following configuration snippet:

ip cef

!

interface GigabitEthernet0/0
 ip address 10.0.0.1 255.255.255.252

mpls ip !

interface GigabitEthernet0/1
 ip address 10.0.1.1 255.255.255.252

mpls ip !

router ospf 1
 network 10.0.0.0 0.0.0.3 area 0
 network 10.0.1.0 0.0.0.3 area 0

! mpls ldp router-id Loopback0 force !

interface Loopback0
 ip address 192.168.0.1 255.255.255.255

What will happen when this router attempts to establish an LDP session with a neighbor on GigabitEthernet0/0?

Question 1mediummultiple choice
Review the full OSPF breakdown →

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 use Loopback0 (192.168.0.1) as the transport address, but the neighbor must have a route to 192.168.0.1 for the session to establish.

The configuration is correct. LDP will use Loopback0 (192.168.0.1) as its router ID and transport address. The neighbor must be able to reach 192.168.0.1 via the IGP. Since OSPF advertises the loopback, it should work. The question tests understanding of LDP transport address usage.

Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

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 use the IP address of GigabitEthernet0/0 as the transport address because Loopback0 is not in OSPF.

    Why it's wrong here

    Loopback0 is advertised via OSPF because the network command includes 10.0.0.0/0.0.0.3, but the loopback is 192.168.0.1/32, which is not covered. Actually, the loopback is not in OSPF, so the neighbor may not have a route to it, causing LDP session failure. This is a subtle issue.

  • ✓

    LDP will use Loopback0 (192.168.0.1) as the transport address, but the neighbor must have a route to 192.168.0.1 for the session to establish.

    Why this is correct

    The 'force' keyword sets the LDP router ID to Loopback0. However, the loopback is not included in the OSPF network statements, so the neighbor may not have reachability to 192.168.0.1, causing LDP session failure. This is a common misconfiguration.

    Related concept

    OSPF neighbours must agree on key parameters.

  • ✗

    LDP will not use Loopback0 because the interface is not configured with 'mpls ip'.

    Why it's wrong here

    The LDP router ID does not require 'mpls ip' on the loopback; it is only a transport address.

  • ✗

    LDP will use the IP address of GigabitEthernet0/1 because it has the highest IP among MPLS-enabled interfaces.

    Why it's wrong here

    The 'force' keyword overrides automatic selection; LDP will use Loopback0 regardless.

Common exam traps

Common exam trap: OSPF can fail even when IP connectivity looks correct

OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.

Trap categories for this question

  • Keyword trap

    The 'force' keyword overrides automatic selection; LDP will use Loopback0 regardless.

  • Command / output trap

    Loopback0 is advertised via OSPF because the network command includes 10.0.0.0/0.0.0.3, but the loopback is 192.168.0.1/32, which is not covered. Actually, the loopback is not in OSPF, so the neighbor may not have a route to it, causing LDP session failure. This is a subtle issue.

Detailed technical explanation

How to think about this question

OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.

KKey Concepts to Remember

  • OSPF neighbours must agree on key parameters.
  • Router ID selection can affect neighbour relationships and LSDB output.
  • OSPF cost influences the preferred path.
  • A route can appear in OSPF information but not become the installed route.

TExam Day Tips

  • Check area mismatch first when OSPF adjacency fails.
  • Review passive interfaces when a network is advertised but no neighbour forms.
  • Use show ip ospf neighbor and show ip route clues carefully.

Key takeaway

OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

Real-world example

How this comes up in practice

A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.

What to study next

Got this wrong? Here's your next step.

Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.

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FAQ

Questions learners often ask

What does this 300-410 question test?

MPLS Operations — This question tests MPLS Operations — OSPF neighbours must agree on key parameters..

What is the correct answer to this question?

The correct answer is: LDP will use Loopback0 (192.168.0.1) as the transport address, but the neighbor must have a route to 192.168.0.1 for the session to establish. — The configuration is correct. LDP will use Loopback0 (192.168.0.1) as its router ID and transport address. The neighbor must be able to reach 192.168.0.1 via the IGP. Since OSPF advertises the loopback, it should work. The question tests understanding of LDP transport address usage.

What should I do if I get this 300-410 question wrong?

Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.

What is the key concept behind this question?

OSPF neighbours must agree on key parameters.

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Last reviewed: Jun 18, 2026

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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.