Quick Answer
The answer is point-to-point. On a Frame Relay point-to-point subinterface, the default OSPF network type is point-to-point because each subinterface is logically treated as a direct link to a single neighbor, eliminating the need for a multi-access environment. Since there is no broadcast or non-broadcast multi-access (NBMA) capability on a point-to-point subinterface, OSPF automatically sets the network type to point-to-point, which means no Designated Router (DR) or Backup Designated Router (BDR) election occurs. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how OSPF behaves over different WAN encapsulation types, especially in MPLS L3VPN contexts where Frame Relay subinterfaces are common. A frequent trap is assuming the default is non-broadcast or broadcast, but those apply only to physical interfaces or multipoint subinterfaces. Memory tip: “Point-to-point subinterface equals point-to-point OSPF—no DR drama.”
This 300-410 practice question tests your understanding of mpls l3vpn. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
In MPLS L3VPN, which OSPF network type is used by default on a Frame Relay point-to-point subinterface when OSPF is enabled?
Broadcast
Why wrong: Broadcast is not the default on point-to-point subinterfaces.
Non-broadcast
Why wrong: Non-broadcast is the default on physical Frame Relay interfaces, not subinterfaces.
Point-to-point
Correct. Point-to-point subinterfaces default to point-to-point network type.
Point-to-multipoint
Why wrong: Point-to-multipoint is not the default; it must be explicitly configured.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Point-to-point
On a point-to-point subinterface over Frame Relay, the default OSPF network type is point-to-point, which does not require DR/BDR election.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Broadcast
Why it's wrong here
Broadcast is not the default on point-to-point subinterfaces.
Non-broadcast
Why it's wrong here
Non-broadcast is the default on physical Frame Relay interfaces, not subinterfaces.
Point-to-point
Why this is correct
Correct. Point-to-point subinterfaces default to point-to-point network type.
Related concept
OSPF neighbours must agree on key parameters.
Point-to-multipoint
Why it's wrong here
Point-to-multipoint is not the default; it must be explicitly configured.
Common exam traps
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.
Detailed technical explanation
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.
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
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
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
MPLS L3VPN — This question tests MPLS L3VPN — OSPF neighbours must agree on key parameters..
The correct answer is: Point-to-point — On a point-to-point subinterface over Frame Relay, the default OSPF network type is point-to-point, which does not require DR/BDR election.
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.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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