This 350-601 practice question tests your understanding of storage network. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which FCoE component is responsible for encapsulating Fibre Channel frames into Ethernet frames?
FCoE module on the switch or adapter
The FCoE module performs encapsulation/decapsulation.
FCoE Forwarder (FCF)
Why wrong: FCF forwards FCoE frames, but encapsulation is done by the endpoint.
Virtual Fibre Channel interface (VFC)
Why wrong: VFC is a logical interface, not the encapsulator.
VN interface
Why wrong: VN interface is a virtual N-port.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
FCoE module on the switch or adapter
The FCoE module on the switch or adapter is the component that performs the encapsulation of native Fibre Channel frames into Ethernet frames. This module handles the conversion by adding an Ethernet header, including the EtherType 0x8906 for FCoE, and managing the mapping of Fibre Channel constructs (e.g., VSANs) to VLANs. Without this module, Fibre Channel traffic cannot traverse an Ethernet network.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
FCoE module on the switch or adapter
Why this is correct
The FCoE module performs encapsulation/decapsulation.
Related concept
Read the scenario before looking for a memorised answer.
FCoE Forwarder (FCF)
Why it's wrong here
FCF forwards FCoE frames, but encapsulation is done by the endpoint.
Virtual Fibre Channel interface (VFC)
Why it's wrong here
VFC is a logical interface, not the encapsulator.
VN interface
Why it's wrong here
VN interface is a virtual N-port.
Common exam traps
Cisco often tests the distinction between the component that performs encapsulation (FCoE module) and the logical interfaces or forwarding entities (VFC, VN, FCF) that rely on that encapsulation, leading candidates to confuse the control-plane role of the FCF or the logical nature of VFC/VN interfaces with the actual encapsulation function.
Detailed technical explanation
Under the hood, the FCoE module implements the FCoE mapping specified in FC-BB-6, where each Fibre Channel frame is encapsulated with an Ethernet header (EtherType 0x8906), a VLAN tag (if used), and an FCoE header (including SOF and EOF markers). A subtle behavior is that the FCoE module also handles the FIP (FCoE Initialization Protocol) for discovery and login before any data frames are sent. In a real-world scenario, when configuring a Cisco Nexus switch for FCoE, the 'feature fcoe' command enables the FCoE module, which then allows VFC interfaces to be created and bound to Ethernet ports.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
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FAQ
Storage Network — This question tests Storage Network — Read the scenario before looking for a memorised answer..
The correct answer is: FCoE module on the switch or adapter — The FCoE module on the switch or adapter is the component that performs the encapsulation of native Fibre Channel frames into Ethernet frames. This module handles the conversion by adding an Ethernet header, including the EtherType 0x8906 for FCoE, and managing the mapping of Fibre Channel constructs (e.g., VSANs) to VLANs. Without this module, Fibre Channel traffic cannot traverse an Ethernet network.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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