350-601 Storage Network Practice Question
In a Fibre Channel over Ethernet (FCoE) deployment, which Data Center Bridging (DCB) feature is responsible for preventing frame loss due to congestion and ensuring the lossless behavior required for FCoE traffic?
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
✓
Priority Flow Control (PFC)
Priority Flow Control (PFC) is a per-priority pause mechanism that creates lossless links for specific traffic classes such as FCoE.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Priority Flow Control (PFC)
Why this is correct
PFC provides per-priority pause to ensure lossless delivery for FCoE traffic.
- ✗
Data Center Bridging Exchange (DCBX)
Why it's wrong here
DCBX is a discovery and capability exchange protocol, not a flow control mechanism.
- ✗
Enhanced Transmission Selection (ETS)
Why it's wrong here
ETS manages bandwidth allocation among traffic classes but does not prevent frame loss.
- ✗
Jumbo frames
Why it's wrong here
Jumbo frames increase the maximum transmission unit to 9000 bytes, reducing CPU overhead from packet fragmentation, but they do not implement any priority-based flow control or congestion notification mechanism. The FCoE requirement for lossless behaviour is satisfied by IEEE 802.1Qbb Priority Flow Control (PFC), which pauses individual traffic classes. Jumbo frames would be correct only in a scenario where the goal is to improve throughput for large data transfers, not to guarantee zero frame drops under congestion.
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