350-601 Storage Network Practice Question
In a Fibre Channel SAN, flow control is managed by buffer credits. Which statement about buffer credits is accurate?
⚠ Common exam trap
Cisco often tests the distinction between Fibre Channel buffer credits and FCoE's Priority Flow Control (PFC), so the trap here is confusing the two lossless mechanisms and assuming buffer credits apply to FCoE.
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 credits help manage congestion and ensure lossless delivery over distance
Buffer credits are a flow control mechanism in Fibre Channel that manage congestion by tracking the number of frames a sender can transmit before receiving an acknowledgment. They ensure lossless delivery over distance by preventing buffer overflow at the receiver, which is critical for maintaining data integrity in SANs. Option D correctly states this dual role of congestion management and lossless delivery.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Buffer credits are allocated per VSAN to isolate traffic
Why it's wrong here
BB_credits are per interface.
- ✗
Increasing buffer credits always improves I/O performance
Why it's wrong here
Oversizing can waste resources; benefit is mostly for long-distance links.
- ✗
Buffer credits are used in FCoE to ensure lossless delivery
Why it's wrong here
FCoE uses PFC, not buffer credits.
- ✓
Buffer credits help manage congestion and ensure lossless delivery over distance
Why this is correct
BB_credits allow a sender to send multiple frames without waiting for acknowledgment.
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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.