350-601 Storage Network Practice Question
Which THREE conditions can cause Fibre Channel buffer credit starvation? (Choose three.)
⚠ Common exam trap
Cisco often tests the distinction between congestion (oversubscription) and buffer credit starvation, where candidates mistakenly associate high oversubscription with credit exhaustion, but credits are a per-port, per-link resource unrelated to oversubscription ratios.
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
✓
Frequent CRC errors causing retransmissions
Frequent CRC errors indicate corrupted frames, which require retransmission. Each retransmission consumes an additional buffer credit, effectively starving the port of available credits for new transmissions. This leads to reduced throughput and potential credit starvation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Frequent CRC errors causing retransmissions
Why this is correct
Correct: Retransmissions consume credits without releasing them.
- ✓
Long-distance links with insufficient credits allocated
Why this is correct
Correct: Each link distance requires a minimum number of credits.
- ✗
High oversubscription ratio on the ISL
Why it's wrong here
Incorrect: Oversubscription causes congestion, not credit starvation.
- ✗
Multiple VSANs configured on the same trunk
Why it's wrong here
Incorrect: VSAN trunking does not affect buffer credits individually.
- ✓
Inadequate number of credits allocated to the port
Why this is correct
Correct: If the pool is too small, credit starvation occurs.
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Written by Johnson Ajibi, MSc IT Security
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