Quick Answer
The correct answer is to assign FCoE traffic to a dedicated VLAN and implement Priority Flow Control (PFC). PFC, defined by IEEE 802.1Qbb, is essential because FCoE requires a lossless transport to prevent frame drops that would corrupt Fibre Channel frames; it achieves this by enabling pause frames on a per-priority basis, allowing the FCoE VLAN to be configured as lossless while standard LAN traffic remains best-effort. This ensures FCoE traffic isolation from LAN traffic by decoupling the flow control behavior, so a burst of LAN data does not trigger pauses on the storage path. On the Cisco DCCOR 350-601 exam, this concept tests your understanding of converged networking—a common trap is confusing PFC with standard Ethernet flow control, which pauses all traffic on a link. Remember the memory tip: PFC is per-priority, not per-port, so always pair a dedicated VLAN with PFC to isolate FCoE from LAN congestion.
This 350-601 practice question tests your understanding of storage network. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An engineer is configuring a storage network with FCoE and must ensure that the FCoE traffic does not interfere with standard LAN traffic. Which two mechanisms should be implemented?
Use the same VLAN for FCoE and LAN.
Why wrong: Causes interference.
Disable flow control on FCoE VLAN.
Why wrong: FCoE needs flow control.
Enable PFC on the FCoE VLAN.
Provides lossless Ethernet.
Assign FCoE traffic to a dedicated VLAN.
Isolates traffic.
Use jumbo frames for LAN traffic only.
Why wrong: Not a separation mechanism.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enable PFC on the FCoE VLAN.
Option C is correct because FCoE requires lossless transport to prevent frame drops that would corrupt Fibre Channel frames. Priority Flow Control (PFC), defined by IEEE 802.1Qbb, enables pause frames on a per-priority basis, allowing the FCoE VLAN to be configured as lossless while standard LAN traffic remains best-effort. This ensures FCoE traffic does not interfere with LAN traffic by isolating the flow control behavior.
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.
Use the same VLAN for FCoE and LAN.
Why it's wrong here
Causes interference.
Disable flow control on FCoE VLAN.
Why it's wrong here
FCoE needs flow control.
Enable PFC on the FCoE VLAN.
Why this is correct
Provides lossless Ethernet.
Related concept
Read the scenario before looking for a memorised answer.
Assign FCoE traffic to a dedicated VLAN.
Why this is correct
Isolates traffic.
Related concept
Read the scenario before looking for a memorised answer.
Use jumbo frames for LAN traffic only.
Why it's wrong here
Not a separation mechanism.
Common exam traps
The trap here is that candidates often think disabling flow control (Option B) is necessary to avoid interference, but FCoE actually requires flow control (PFC) to be enabled, and the key is to isolate it to a dedicated VLAN.
Detailed technical explanation
Under the hood, FCoE encapsulates Fibre Channel frames into Ethernet frames and relies on a lossless class of service (CoS) value, typically CoS 3, which is mapped to a PFC-enabled priority. The dedicated FCoE VLAN (typically VLAN 1002 or a custom VLAN) ensures that FCoE traffic is logically separated, while PFC on that VLAN provides per-priority pause frames that prevent buffer overflow without affecting other VLANs. In a real-world scenario, misconfiguring PFC on the native VLAN can cause LAN traffic to be paused inadvertently, leading to performance degradation.
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.
What to study next
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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: Enable PFC on the FCoE VLAN. — Option C is correct because FCoE requires lossless transport to prevent frame drops that would corrupt Fibre Channel frames. Priority Flow Control (PFC), defined by IEEE 802.1Qbb, enables pause frames on a per-priority basis, allowing the FCoE VLAN to be configured as lossless while standard LAN traffic remains best-effort. This ensures FCoE traffic does not interfere with LAN traffic by isolating the flow control behavior.
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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