350-601 Storage Network Practice Question
An engineer is troubleshooting a performance issue on a Cisco MDS 9700 switch. The 'show interface fc1/1' output shows CRC errors incrementing slowly. The interface is connected to a storage array. Which two actions should the engineer take to resolve the issue?
⚠ Common exam trap
Cisco often tests the distinction between physical-layer errors (CRC) and flow-control issues (BB_credit), tempting candidates to choose a single answer when both a physical fix and a protocol-level tuning are required.
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
✓
Replace the fiber optic cable and SFP.
CRC errors on a Fibre Channel interface typically indicate physical-layer issues such as faulty cabling, damaged SFPs, or dirty optical connectors. Replacing the fiber optic cable and SFP (Option B) directly addresses the most common root cause of CRC errors. Additionally, enabling BB_credit recovery (Option C) helps mitigate performance degradation caused by buffer credit starvation, which can manifest as CRC-like symptoms in some scenarios.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the MTU size on the interface.
Why it's wrong here
MTU affects frame size but not CRC errors.
- ✓
Replace the fiber optic cable and SFP.
Why this is correct
Faulty cables or SFPs are common causes of CRC errors.
- ✓
Enable BB_credit recovery on the interface.
Why this is correct
BB_credit recovery helps manage buffer credit issues that can cause CRC errors.
- ✗
Clear the interface counters.
Why it's wrong here
Clearing counters hides the problem without resolving it.
- ✗
Change the interface speed from auto to a fixed value.
Why it's wrong here
Speed mismatch is less likely; fixing speed may cause other issues.
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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.