350-601 Network Practice Question
An engineer notices that a vPC peer link is flapping. Which vPC component must be operational for the vPC to function correctly?
⚠ Common exam trap
Cisco often tests the misconception that the peer keepalive link is the most critical component for vPC operation, but in reality, the peer link is essential for data and control-plane synchronization, while the keepalive link is only a secondary heartbeat mechanism.
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
✓
vPC peer link
The vPC peer link is the critical component that must be operational for the vPC to function correctly. It carries control-plane traffic (e.g., Cisco Fabric Services over Ethernet, or CFSoE) and data-plane traffic between the two vPC peer switches. If the peer link flaps, the vPC domain cannot synchronize the necessary state information, causing the vPC to fail or become unstable.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
vPC member port
Why it's wrong here
Member ports are the downstream ports.
- ✗
vPC consistency check
Why it's wrong here
Consistency check is a feature, not a component.
- ✓
vPC peer link
Why this is correct
Peer link must be up for vPC to operate.
- ✗
vPC peer keepalive link
Why it's wrong here
Peer keepalive is for monitoring, but peer link is required for data.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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