350-601 Storage Network Practice Question
Exhibit
switch# show interface fcoe 1/1 fcoe1/1 is up, line protocol is up Hardware is FCoE capable Port WWN is 20:01:00:de:fb:ff:00:01 Admin port mode is F, trunk mode is off SFP is Gigabit Ethernet VSAN is 100, FCoE VLAN is 100, FCID is 0x010002 Data frames: 1500 bytes, CRC errors: 0 Priority Flow Control (PFC): enabled PFC frames sent: 0, PFC frames received: 152
Refer to the exhibit. An engineer is troubleshooting poor FCoE performance. The exhibit shows output from the FCoE interface. Which observation indicates a potential issue?
⚠ Common exam trap
Cisco often tests the misconception that CRC errors or MTU size are the primary causes of FCoE performance issues, when in reality the asymmetry in PFC frame counts is a more subtle and direct indicator of congestion in a lossless fabric.
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 frames received is high compared to PFC frames sent
A high count of PFC frames received compared to PFC frames sent indicates that the local interface is receiving many pause frames from the peer, which suggests the peer is experiencing congestion and is forcing the local interface to pause its transmission. This asymmetry is a classic symptom of a buffer congestion or credit starvation issue in the FCoE SAN fabric, leading to poor FCoE performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
PFC frames received is high compared to PFC frames sent
Why this is correct
Receiving many pause frames implies the peer is congested or PFC mismatch.
- ✗
The CRC error count is zero
Why it's wrong here
Zero CRC errors indicate no physical errors.
- ✗
Data frames are 1500 bytes, which is too small for FCoE
Why it's wrong here
1500 bytes is typical; jumbo frames are not indicated here.
- ✗
The admin port mode is F instead of NP
Why it's wrong here
F mode is correct for an end device.
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