The answer is a targeted LDP session established between two non-directly connected routers. This is confirmed by the output showing “Targeted Hello 10.6.6.6 -> 10.6.6.7, active, passive” under LDP discovery sources, which explicitly indicates the session was formed using targeted hellos rather than the default link-local discovery mechanism. On the ENCOR 350-401 exam, this command tests your ability to differentiate between link-local and targeted LDP sessions, a common point of confusion where candidates mistakenly assume all LDP neighbors must be directly connected. The key trap is that the “Peer LDP Ident” and “TCP connection” lines show IP addresses that are not on the same subnet, reinforcing the non-directly connected nature. A useful memory tip: if you see “Targeted Hello” in the output, think “T for Tunnel or T for Two non-adjacent routers,” as targeted sessions are often used for MPLS traffic engineering or LDP over RSVP tunnels.
CCNP MPLS Practice Question
This 350-401 practice question tests your understanding of mpls. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
A network engineer runs the following command on Router R6:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
This is a targeted LDP session established between two non-directly connected routers.
The output shows 'Targeted Hello' in the discovery sources, indicating this is a targeted LDP session (not link-local). The session is operational and uses targeted hellos.
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.
✗
This is a link-local LDP session because the discovery source is an interface.
Why it's wrong here
The discovery source is explicitly 'Targeted Hello', not an interface.
✓
This is a targeted LDP session established between two non-directly connected routers.
Why this is correct
Targeted hellos are used for non-directly connected peers, and the output confirms targeted discovery.
This is a multicast LDP session because the hold time is 15 seconds.
Why it's wrong here
Hold time is a parameter for LDP sessions, not an indicator of multicast.
✗
This is a BGP session because the TCP connection shows port 179.
Why it's wrong here
Port 179 is the BGP port, but here it's shown as the local port for LDP (which is unusual but given in output). The session is LDP.
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
Command / output trap
Port 179 is the BGP port, but here it's shown as the local port for LDP (which is unusual but given in output). The session is LDP.
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 350-401 OSPF questions on adjacency and route selection.
MPLS — This question tests MPLS — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: This is a targeted LDP session established between two non-directly connected routers. — The output shows 'Targeted Hello' in the discovery sources, indicating this is a targeted LDP session (not link-local). The session is operational and uses targeted hellos.
What should I do if I get this 350-401 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 350-401 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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