Quick Answer
The answer is point-to-point. This is the default EIGRP network type on a Frame Relay point-to-point subinterface because EIGRP automatically detects the underlying interface type; when a subinterface is configured as point-to-point, EIGRP sets its network type to point-to-point, which uses 5-second hello timers and eliminates the need for a DR/BDR election. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how EIGRP adapts to different Layer 2 topologies, often appearing in questions that contrast multipoint interfaces—where the default is non-broadcast and requires neighbor statements—with point-to-point subinterfaces. A common trap is assuming all Frame Relay interfaces default to non-broadcast, but point-to-point subinterfaces bypass this. Memory tip: think “P2P = no DR, fast hellos”—point-to-point subinterfaces keep it simple with 5-second hellos and no election overhead.
This 300-410 practice question tests your understanding of eigrp troubleshooting. 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.
Which of the following is the default EIGRP network type on a Frame Relay point-to-point subinterface?
NBMA
Why wrong: Incorrect. NBMA is the default for multipoint interfaces, not point-to-point subinterfaces.
Point-to-point
Correct. Point-to-point subinterfaces default to point-to-point network type.
Broadcast
Why wrong: Incorrect. Broadcast is used on Ethernet or when manually configured.
Point-to-multipoint
Why wrong: Incorrect. This is not a default EIGRP network type for point-to-point subinterfaces.
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
EIGRP automatically detects the interface type. For point-to-point subinterfaces, it defaults to point-to-point network type, which uses 5-second hellos and does not require a DR/BDR.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
NBMA
Why it's wrong here
Incorrect. NBMA is the default for multipoint interfaces, not point-to-point subinterfaces.
Point-to-point
Why this is correct
Correct. Point-to-point subinterfaces default to point-to-point network type.
Related concept
CIDR notation defines the prefix length.
Broadcast
Why it's wrong here
Incorrect. Broadcast is used on Ethernet or when manually configured.
Point-to-multipoint
Why it's wrong here
Incorrect. This is not a default EIGRP network type for point-to-point subinterfaces.
Common exam traps
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 300-410 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — CIDR notation defines the prefix length..
The correct answer is: Point-to-point — EIGRP automatically detects the interface type. For point-to-point subinterfaces, it defaults to point-to-point network type, which uses 5-second hellos and does not require a DR/BDR.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 300-410 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 18, 2026
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