350-601 Network Practice Question
An engineer is configuring OSPF on a Nexus 9000 switch in a data center spine-leaf topology. Which OSPF network type is most appropriate on the point-to-point links between leaf and spine switches to ensure fast convergence?
⚠ Common exam trap
Cisco often tests the misconception that 'broadcast' is the default and therefore acceptable for all Ethernet links, but the trap here is that candidates overlook the DR/BDR election overhead on point-to-point links, which directly impacts convergence time in a spine-leaf design.
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
✓
point-to-point
In a spine-leaf topology, the links between leaf and spine switches are typically point-to-point, even if they are Ethernet interfaces. Configuring the OSPF network type as point-to-point on these links eliminates the need for a Designated Router (DR) and Backup Designated Router (BDR) election, which reduces OSPF adjacency formation time and ensures faster convergence. This network type also allows OSPF to use multicast hello packets (224.0.0.5) without the overhead of a DR/BDR election, making it the most appropriate choice for fast convergence.
Answer analysis
Option-by-option breakdown
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 requires DR/BDR election and is slower on point-to-point links.
- ✗
point-to-multipoint
Why it's wrong here
Point-to-multipoint is used when one interface connects to multiple, not for direct spine-leaf.
- ✓
point-to-point
Why this is correct
Point-to-point is optimal for direct links, avoids DR/BDR.
- ✗
non-broadcast
Why it's wrong here
Non-broadcast is used for NBMA networks, not point-to-point.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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