350-601 Network Practice Question
A network engineer is configuring a Fabric Extender (FEX) to connect to a parent switch. Which best practice should be followed for FEX host interfaces?
⚠ Common exam trap
Cisco often tests the misconception that FEX uplinks require LACP or that FEX IDs can be shared for redundancy, when in fact FEX uplinks use static fabric channels and each FEX must have a unique ID.
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 Virtual Port Channel (vPC) on the parent switch.
Enabling Virtual Port Channel (vPC) on the parent switch is a best practice for FEX host interfaces because it allows the FEX to be dual-homed to two separate parent switches, providing link-level redundancy and active-active forwarding. Without vPC, the FEX would rely on a single parent switch, creating a single point of failure and potentially causing traffic black-holing during a parent switch failure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure all host interfaces as trunk ports.
Why it's wrong here
Host interfaces may be access ports; not a best practice.
- ✗
Use the same FEX ID for redundancy.
Why it's wrong here
Each FEX must have a unique ID.
- ✗
Use LACP for the FEX uplinks.
Why it's wrong here
FEX uplinks are proprietary and do not use LACP.
- ✓
Enable Virtual Port Channel (vPC) on the parent switch.
Why this is correct
vPC provides active-active redundancy for FEX uplinks.
- ✗
Disable spanning-tree on FEX host interfaces.
Why it's wrong here
Spanning-tree should remain enabled to prevent loops.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-601 exam.