350-601 Storage Network Practice Question
A data center uses FCoE on Nexus 9000 switches. The storage team reports inconsistent performance during peak times. Queuing drops are seen on the FCoE-enabled interfaces. Which QoS configuration change would best address the issue?
⚠ Common exam trap
Cisco often tests the misconception that pause frames alone guarantee lossless delivery, but the trap is that insufficient buffer allocation for the no-drop class will still cause drops under burst conditions, regardless of pause frame configuration.
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
✓
Ensure sufficient buffer allocation for the no-drop class
In FCoE networks, lossless behavior is required for storage traffic, which is enforced by priority flow control (PFC) on the no-drop class. Queuing drops on FCoE-enabled interfaces indicate that the no-drop class is experiencing buffer exhaustion under congestion. Increasing buffer allocation for the no-drop class ensures that FCoE frames are not dropped, maintaining the lossless fabric required by Fibre Channel over Ethernet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable WRED on the FCoE class
Why it's wrong here
Incorrect: FCoE is lossless; WRED drops packets.
- ✗
Increase MTU on the FCoE VLAN
Why it's wrong here
Incorrect: MTU does not affect queuing drops.
- ✓
Ensure sufficient buffer allocation for the no-drop class
Why this is correct
Correct: Allocating more buffers to the no-drop class prevents drops.
- ✗
Increase the number of pause frames on the no-drop class
Why it's wrong here
Incorrect: More pause frames can lead to congestion spreading.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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