350-601 Storage Network Practice Question
A team is configuring FCoE on a Cisco Nexus switch. Which TWO steps are mandatory to establish a lossless FCoE link?
⚠ Common exam trap
Cisco often tests the misconception that PFC must be manually configured as a separate step, when in fact it is automatically enabled by the 'fcoe' command, and that VSAN mapping is required for link establishment rather than for Fibre Channel forwarding.
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
✓
Enable FCoE on the interface using the 'fcoe' command
The 'fcoe' interface command is mandatory to enable FCoE processing on a specific interface. Without this command, the interface will not participate in FCoE traffic. Option C is correct because a VSAN must be created and mapped to an FCoE VLAN for the Fibre Channel fabric to recognize the FCoE link. This mapping allows the switch to associate the Ethernet VLAN with a VSAN for FC forwarding. Options B and D are not mandatory because Priority Flow Control (PFC) and Data Center Bridging eXchange (DCBX) are automatically enabled when FCoE is configured on the interface. Option E is not mandatory because although FCoE requires jumbo frames, the MTU can be set globally or is often already set to support FCoE, and it is not a separate mandatory step for link establishment.
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 FCoE on the interface using the 'fcoe' command
Why this is correct
Correct. The 'fcoe' interface command is mandatory to enable FCoE processing on the interface.
- ✗
Enable Priority Flow Control (PFC) as a separate CLI
Why it's wrong here
Incorrect. Priority Flow Control (PFC) is automatically enabled when FCoE is configured on the interface; it does not require a separate CLI command.
- ✓
Create a VSAN and map it to an FCoE VLAN
Why this is correct
Correct. A VSAN must be created and mapped to an FCoE VLAN to associate the Ethernet VLAN with a Fibre Channel VSAN, which is mandatory for the FCoE link to participate in the FC fabric.
- ✗
Configure DCBX to advertise and negotiate FCoE capabilities
Why it's wrong here
Incorrect. DCBX is automatically enabled when FCoE is configured on the interface; no separate configuration step is required.
- ✗
Set the MTU to 9216 bytes to accommodate FCoE frames
Why it's wrong here
Incorrect. While FCoE requires jumbo frames, setting the MTU to 9216 bytes is not a mandatory step for establishing the lossless FCoE link; it is often already configured or can be set globally.
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