350-601 Storage Network Practice Question
An administrator is troubleshooting a performance issue in an FC SAN. The initiator and target are in the same VSAN. The link is 16 Gbps but throughput is only 4 Gbps. The engineer checks the BB_Credit utilization and sees a high count of BB_Credit zero. What is the most likely cause?
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
✓
Buffer-to-buffer credit exhaustion
BB_Credit zero indicates buffer-to-buffer credit exhaustion, which pauses transmission and reduces throughput. This is typically due to distance or small credit pool. Link errors would show CRC errors, congestion would cause other symptoms, and zoning is unrelated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Congestion on the target port
Why it's wrong here
Target port congestion would likely show other signs like high latency, not BB_Credit zero.
- ✗
High link error rates
Why it's wrong here
Link errors would show CRC or other error counters, not BB_Credit utilization.
- ✗
Incorrect zoning configuration
Why it's wrong here
Zoning affects connectivity, not throughput on a working link.
- ✓
Buffer-to-buffer credit exhaustion
Why this is correct
BB_Credit zero means the port has run out of credits, causing pauses and low throughput.
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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.