350-601 Storage Network Practice Question
Which of the following is a required characteristic of an FCoE SAN?
⚠ Common exam trap
Cisco often tests the misconception that jumbo frames are mandatory for FCoE, but the actual required characteristic is lossless Ethernet via PFC, as jumbo frames are optional and only improve efficiency.
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
✓
Lossless Ethernet (PFC) must be enabled.
FCoE (Fibre Channel over Ethernet) requires a lossless Ethernet fabric to prevent frame drops, which would corrupt Fibre Channel frames. Priority Flow Control (PFC), defined in IEEE 802.1Qbb, enables lossless operation by pausing traffic on individual CoS queues, ensuring no-drop behavior for FCoE traffic. Without PFC, standard Ethernet's best-effort delivery would cause frame loss, breaking FCoE's reliability requirements.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Jumbo frames must be enabled.
Why it's wrong here
Not strictly required, though recommended.
- ✗
Spanning Tree Protocol must be disabled.
Why it's wrong here
STP can be used but is often disabled for FCoE VLANs.
- ✗
Link aggregation (LACP) is required.
Why it's wrong here
Not required.
- ✓
Lossless Ethernet (PFC) must be enabled.
Why this is correct
FCoE requires no-drop.
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