350-601 Storage Network Practice Question
Which statement about Fibre Channel buffer credits is true?
⚠ Common exam trap
Cisco often tests the distinction between flow control (buffer credits) and error detection (CRC) or fabric-level features (VSANs, load balancing), so the trap here is confusing a link-level mechanism with higher-layer or fabric-wide functions.
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
✓
They control the flow of frames between directly connected ports.
Fibre Channel buffer credits implement a credit-based flow control mechanism between directly connected ports (Nx_Port to Fx_Port or E_Port to E_Port). Each port advertises its available buffer credits (BB_Credit) to the directly attached peer, and the sender can only transmit a frame when it has a positive credit count. This prevents frame loss due to buffer overflow at the receiver, ensuring lossless transmission over the link.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
They are used for load balancing across multiple paths.
Why it's wrong here
Load balancing is done by other mechanisms.
- ✓
They control the flow of frames between directly connected ports.
Why this is correct
Buffer credits manage the number of outstanding frames.
- ✗
They are allocated per VSAN.
Why it's wrong here
Buffer credits are allocated per port.
- ✗
They detect CRC errors in frames.
Why it's wrong here
CRC is for error detection, not buffer credits.
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