350-601 Network Practice Question
A network engineer is configuring OSPF on a Nexus switch. To ensure fast convergence in case of a link failure, which OSPF feature should be enabled?
⚠ Common exam trap
Cisco often tests the distinction between features that improve convergence speed (like Fast Hello or BFD) versus features that improve scalability or security (like stub areas, summarization, or authentication), leading candidates to mistakenly choose options that optimize the OSPF database rather than accelerate failure detection.
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 (B) is the correct feature to enable for fast convergence on a Nexus switch because it reduces the dead interval to less than one second by sending Hello packets at sub-second intervals (e.g., every 333 ms for a 1-second dead interval). This allows OSPF neighbors to detect a link failure much faster than the default 40-second dead interval on broadcast networks, triggering quicker SPF recalculation and route 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.
- ✗
OSPF authentication
Why it's wrong here
Authentication secures OSPF but does not improve convergence.
- ✓
OSPF Fast Hello
Why this is correct
Fast Hello allows sub-second hello intervals for faster failure detection.
- ✗
OSPF stub area
Why it's wrong here
Stub areas reduce LSDB size but do not directly speed convergence.
- ✗
OSPF route summarization
Why it's wrong here
Summarization reduces routing table size but not convergence time.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-601 exam.