350-601 Storage Network Practice Question
An engineer is configuring FCoE on a Cisco UCS Fabric Interconnect. The network requires lossless Ethernet to support FCoE traffic. Which Data Center Bridging (DCB) feature must be enabled first to ensure no frames are dropped due to congestion?
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
✓
PFC
PFC (Priority Flow Control) is the DCB mechanism that provides lossless Ethernet for 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.
- ✗
ETS
Why it's wrong here
ETS allocates bandwidth, but does not prevent frame loss.
- ✗
DCBX
Why it's wrong here
DCBX exchanges DCB parameters, but losslessness requires PFC.
- ✗
FIP
Why it's wrong here
FIP is the FCoE Initialization Protocol, not a DCB feature.
- ✓
PFC
Why this is correct
Priority Flow Control (PFC), a DCB mechanism, must be enabled first because it creates lossless Ethernet by pausing individual traffic classes (e.g., FCoE) at the link layer when congestion occurs, preventing frame drops. This satisfies the stem’s explicit requirement for lossless transport, whereas other DCB features like ETS only manage bandwidth allocation without guaranteeing zero frame loss.
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