350-601 Network Practice Question
An engineer is configuring OSPF in a data center fabric with multiple Nexus 9000 switches. To ensure fast convergence after a link failure, which OSPF feature should be enabled?
⚠ Common exam trap
Cisco often tests the distinction between features that improve failure detection speed (like Fast Hello or BFD) versus features that optimize LSA propagation or reduce database size (like LSA throttling or stub areas), leading candidates to confuse convergence optimization with detection acceleration.
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
✓
OSPF Fast Hello
OSPF Fast Hello reduces the dead interval to less than 1 second by sending Hello packets at sub-second intervals (e.g., every 333 ms for a 1-second dead interval). This allows OSPF to detect a link failure in milliseconds rather than the default 40 seconds, significantly improving convergence time in a data center fabric where rapid failover is critical.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
OSPF authentication
Why it's wrong here
Authentication provides security, not convergence.
- ✓
OSPF Fast Hello
Why this is correct
Fast Hello sends hellos at sub-second intervals for fast failure detection.
- ✗
OSPF LSA throttling
Why it's wrong here
Throttling controls LSA generation, not detection.
- ✗
OSPF stub area
Why it's wrong here
Stub area reduces LSDB size but does not speed convergence.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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